EP4739507A1 - Print fluid reservoir - Google Patents

Abstract

A molded body (110) for a fluid ejection device assembly (100) may include a reservoir to store print fluid. The reservoir may include a main reservoir chamber (111), a sump (118) under and open to the main chamber, at least one protrusion (119) into the sump to support a foam body in the main reservoir chamber, and a fluid output (112) to output the print fluid to a fluid ejection device (121).

Description

PRINT FLUID RESERVOIR

BACKGROUND

[0001] Inkjet printing involves depositing ink onto a surface, such as sheet of paper. Print fluid can be stored in a print fluid reservoir until it is used for printing. Fluid ejection device assemblies may include print fluid reservoirs and a fluid ejection die attached to the reservoir.

BRIEF DESCRIPTION OF THE DRAWINGS

[0002] FIG. 1 illustrates an example fluid ejection device assembly including a protrusion into a sump of a molded body.

[0003] FIG. 2 illustrates an example molded body in a fluid ejection device assembly.

[0004] FIG. 3 illustrates an example fluid ejection device assembly.

[0005] FIG. 4 illustrates a perspective view of an example molded body.

[0006] FIG. 5 illustrates a perspective view of an example fluid ejection device assembly including the molded body of FIG. 4 and an example fluid ejection device.

[0007] FIG. 6 illustrates a perspective view of the fluidic structure assembly of FIG. 5.

[0008] FIG. 7 illustrates a perspective view of another example fluid ejection device assembly.

[0009] FIG. 8 illustrates an exploded view of the example fluid ejection device assembly of FIG. 7.

[0010] FIG. 9 illustrates another exploded view of the example fluid ejection device assembly of FIG. 7.

[0011] FIG. 10 illustrates a cross-section view of a molded body of the fluid ejection device assembly of FIG. 7. [0012] FIG. 11 illustrates a view of a bottom portion of the molded body of the fluid ejection device assembly of FIG. 7.

[0013] FIG. 12 illustrates a perspective view of the fluid ejection device assembly of FIG. 7.

[0014] FIG. 13 illustrates a bottom view of a portion of the fluid ejection device assembly of FIG. 7.

[0015] FIG. 14 illustrates a bottom view of the fluid ejection device assembly of FIG. 7.

[0016] FIG. 15 illustrates a perspective view of sumps of the molded body of the fluid ejection device assembly of FIG. 7.

[0017] FIG. 16 illustrates a perspective view of the molded body of the fluid ejection device assembly of FIG. 7 including example support ribs.

[0018] FIG. 17 illustrates a top interior view of the molded body including support ribs of FIG. 16.

[0019] FIG. 18 illustrates a top interior view of the molded body of FIG. 7 including an alternative example arrangement of support ribs.

[0020] FIG. 19 illustrates a perspective view of the molded body 410 of FIG. 7 including the alternative arrangement of support ribs of FIG. 18.

[0021] FIG. 20 illustrates the molded body of FIG. 16 formed with coring to reduce a sump volume.

[0022] FIG. 21 illustrates a perspective view of a bottom of the molded body of FIG. 20.

[0023] The foregoing and other features of the present disclosure will become apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict only several examples in accordance with the disclosure and are therefore, not to be considered limiting of its scope, the disclosure will be described with additional specificity and detail through use of the accompanying drawings.

DETAILED DESCRIPTION

[0024] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative examples described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the figures, can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are explicitly contemplated and made part of this disclosure.

[0025] This disclosure relates to fluid ejection device assemblies. A fluid ejection device assembly may include a fluid ejection device for dispensing print fluid and a reservoir for storing the print fluid. The print fluid may include any 2D or 3D print agent including ink for printing on a medium such as paper (2D) or (e.g., powdered) build material (3D). The print fluid may include dispensable fluid to be dispensed at relatively high precision (as to volume and/or location) for fields of implementation other that 2D or 3D imaging, including but not limited to forensic, laboratory or pharmaceutical applications.

[0026] FIG. 1 illustrates an example fluid ejection device assembly 100 including a protrusion 119 into a sump 118 of a molded body 110. Fig. 1 may represent a diagrammatical side view. The fluid ejection device assembly 100 may be used to store and eject print fluid in a controlled manner for printing. The fluid ejection device assembly 100 may be a replaceable print cartridge, for example for inkjet printing. The molded body 110 includes a reservoir to store print fluid. The molded body 110 may be a single component of the fluid ejection device assembly 100 to which other components can be attached, such as a fluidic structure assembly, fluid ejection device and/or lid. The reservoir includes a main reservoir chamber 111, the sump 118, and a fluid output 112. The sump 118 is under and open to the main reservoir chamber 111 such that print fluid and/or air in the main reservoir chamber 111 can pass into the sump 118 and print fluid in the sump 118 can pass into the main reservoir chamber 111. The sump 118 includes the protrusion 119. The protrusion 119 extends from a wall of the molded body 110 into the sump 118. The protrusion 119 reduces a volume of the sump 118, reducing a volume of print fluid and/or air in the sump. Print fluid in the sump is to be delivered to the fluid ejection device assembly 100. The fluid output 112 outputs the print fluid from the main reservoir chamber 111 to a fluid ejection device 121. The fluid ejection device may include drop ejectors for ejecting print fluid for printing. The fluid ejection device may include a fluid ejection die (i.e., print die). The print die may include a substrate, thin film circuitry and a nozzle plate. Drop generators or drop ejectors may include nozzles in the nozzle plate, resistors in the thin film circuitry to drive drops out of the nozzles, and transistors in the thin film circuitry to activate the resistors. In the examples illustrated in the different figures, the fluid ejection device includes one or more print dies embedded in a rigid molded compound. The compound fluid ejection device is attached to a fluidic structure. In other examples, the fluid ejection device may comprise a single print die with one or more drop generator arrays, not embedded in compound. The fluid ejection device may be separately coupled to the molded body. The fluid output 112 is part of the molded body 110. The fluid output 112 is fluidly connected to the main reservoir chamber 111 such that print fluid flows from the main reservoir chamber 111 through the fluid output 112 to the fluid ejection device 121. For multi color assemblies, multiple main reservoir chambers with multiple corresponding fluid outputs may be provided, whereby each fluid output may connect to a corresponding drop generator array. A fluidic structure may be provided between the fluid output and the fluid ejection device. The fluid ejection device may be attached to the fluidic structure, whereby both may be part of a fluidic structure assembly.

[0027] In some examples, an inner volume of the sump extends at least partially under the fluid output 112. In some examples, the inner volume of the sump extends at least partially next to, and/or above, the fluid output 112. The sump 118 may be defined within the molded body 110 as a region of the reservoir below the main reservoir chamber 111, for example forming a cheek or protrusion in the exterior of the molded body next to the fluid output 112. The sump 118 may be defined within the molded body 110 as a region of the reservoir below an upper edge of the fluid output 112 within the molded body, whereby the fluid output may extend downwards from a bottom of the main reservoir chamber 111 forming a channel. The sump 118 may be defined within the molded body 110 as a region of the reservoir below a foam insert (not shown) in the main reservoir chamber 111. The foam insert is a capillary medium that retains ink inside through capillary action, whereby the fluid ejection device may retract ink from the foam insert by fluid ejection. As fluid is ejected, fluid is withdrawn against the force of the capillary action of the foam insert. The foam insert or body may be provided in the main reservoir chamber 111. The foam body may soak print fluid from the sump 118 into the main reservoir chamber 111 such that the print fluid can flow from the main reservoir chamber 111 through the fluid output 112 to the fluid ejection device 121.

[0028] In some examples, the sump 118 includes a first sump and a second sump open to the main reservoir chamber. The first sump and the second sump may be at lateral sides of the reservoir on opposite lateral sides of the molded body 110. The fluid output 112 may be between the first sump and the second sump with both sumps extending under the main reservoir chamber 111. The first sump may be different than the second sump. The first sump and the second sump may be identical, symmetric, or mirror images of each other. The fluid output 112 may also extend under the main reservoir chamber 111, extending downwards from an opening in the bottom of the reservoir chamber.

[0029] The protrusion 119 may include multiple protrusions in the first sump and/or the second sump. The protrusion 119 may extend vertically upwards from a bottom wall of the sump 118. The protrusion may extend horizontally inwards into the sump 118 from a side wall of the sump 118. The protrusion 119 may extend from a first side wall of the plurality of side walls to a second side wall of the plurality of side walls. The protrusion 119 may include a substantially perpendicular bend between the first side wall and the second side wall. The protrusion 119 may extend diagonally from the first side wall to the second side wall. The sump 118 may be cubical shape with a plurality of side walls and a bottom wall, for example with rounded edges between the walls. In other examples, the sump 118 may include a single side wall. The sump 118 may be cylindrical, or cup-shaped. The sump 118 may be in the shape of a hollow half-sphere. The protrusion 119 may extend from the single side wall to the single side wall. The protrusion 119 may include a substantially perpendicular bend. The sump 118 may have any shape capable of being molded as part of the molded body 110.

[0030] The protrusion 119 may include a plurality of protrusions. The plurality of protrusions may extend to different lengths within the sump 118. The plurality of protrusion may extend in different directions within the sump 118. The plurality of protrusions may be spaced apart from one another within the sump 118. In an example, a first protrusion extends vertically upwards from a bottom wall of the sump 118, a second protrusion extends horizontally inwards into the sump 118 from a first side wall of the sump 118, and a third protrusion extends from the first side wall to a second side wall of the sump 118, the third protrusion including a substantially perpendicular bend between the first side wall and the second side wall. [0031] FIG. 2 illustrates an example molded body 210 in a fluid ejection device assembly 200. The molded body includes a reservoir to store print fluid therein. The reservoir includes a main volume 211, a first sump 218a, a second sump 218b, and a fluid output 212. The first sump 218a has a first volume under the main volume 211. An external wall of the first sump 218a forms a first cheek 116a of the molded body 210. The second sump 218b has a second volume under the main volume 211. An external wall of the second sump 218b forms a second cheek 116b of the molded body 210. The fluid output 212 is configured to output the print fluid to a fluid ejection device 221, that can be mounted to the molded body 210. The fluid ejection device 221 extends between the first cheek 116a and the second cheek 116b. A bottom surface of the first cheek 116a and the second cheek 116b may be flush with a bottom surface of the fluid ejection device 221 in a mounted condition of the fluid ejection device 221 to the molded body 210. The fluid ejection device 221 may be supported by a fluidic structure, as part of a fluidic structure assembly.

[0032] In some examples, the molded body 210 may include at least one protrusion (not shown in FIG. 2) similar to the protrusion 119 in the first sump 218a and/or the second sump 218b to support a foam body. The foam body may be inserted in the main volume 211 to hold the print fluid such that it can flow to the fluid ejection device 221 via the fluid output 212. The foam body may wick print fluid from the first sump 218a and the second sump 218b into the main volume 211. The at least one protrusion may include a plurality of support ribs, where the plurality of support ribs may be spaced within the first sump 218a to prevent displacement of the foam in the molded body. The molded body 210 may include a support rib extending from a wall of the molded body 210 into the first sump 218a. The support rib may be one of the plurality of support ribs. The support rib may be configured to support a foam body within the reservoir so that a bottom of the foam body extends approximately at the height of the fluid output 212. The support rib may extend vertically upwards from a bottom wall of the first sump 218a. The support rib may extend horizontally inwards into the first sump 218a from a side wall of the first sump 218a.

[0033] In the illustrated example, the sumps 218, 218b are cubical-shaped, with rounded edges. In other examples, the first sump 218a and/or the second sump 218b may be cylindrical or cup-shaped. In some examples, the first sump 218a and the second sump 218b may be identical, symmetric, and/or mirror images of each other. In some examples, the first sump 218a and the second sump 218b may be different. The first sump 218a and the second sump 218b may include symmetric support ribs or different numbers and/or configurations of support ribs. In other examples a single sump may be provided that extends along more than one side of the fluid ejection device and/or fluidic structure, for example around the back.

[0034] The fluid ejection device assembly 200 may include the molded body 210 and a fluidic structure assembly secured to the molded body 210 to receive the print fluid from the fluid output. The fluidic structure assembly may include the fluid ejection device 221. The fluidic structure assembly may include a fluidic structure to support the fluid ejection device 221. The fluid ejection device 221 may be adjacent to the first sump 218a and/or the second sump 218b to receive the print fluid from the reservoir. The fluidic structure assembly may be arranged at least partially between the first sump and the second sump downstream of the reservoir. A bottom surface (e.g., nozzle plate surface) of the fluid ejection device 221 may be flush with a bottom of the first sump 218a and/or a bottom of the second sump.

[0035] FIG. 3 illustrates an example fluid ejection device assembly 300 for a fluid cartridge. The fluid delivery assembly 300 includes a reservoir 310 to store print fluid therein. The reservoir 310 includes a main print fluid reservoir chamber 311 including a capillary medium 340 to hold the print fluid. Other example reservoir bodies may include multiple main reservoir chambers for multiple fluid colors. A single main reservoir chamber can be used for black ink. The reservoir 310 may be a single molded body as described with reference to Fig. 1 or Fig. 2. The capillary medium 340 may be a foam insert or body in the main print fluid reservoir chamber 311. The reservoir 310 includes a first sump 318a having a first sump volume and a second sump 318b having a second sump volume. The first sump 318a and the second sump 318b are laterally positioned and extend below the capillary medium 340 in an up-right and/or installed condition of the fluid cartridge. Free print fluid in each sump below the capillary medium 340, if any, may be drawn into the capillary medium. The fluid delivery assembly 300 includes a fluidic structure assembly 320 secured to the reservoir 310 below the main print fluid reservoir chamber 311. The main print fluid reservoir chamber 311 may be the main reservoir chamber explained above. The fluidic structure assembly 320 is positioned laterally between the first sump 318a and the second sump 318b.

[0036] In some examples, the first sump 318a, the second sump 318b, and the fluidic structure assembly 320 extend laterally next to each other along a width of the reservoir 310 below the main print fluid reservoir chamber 311 and capillary medium 340. The sump 318a, 318b may extend at each opposite lateral sides of the fluidic structure assembly 320. The fluidic structure assembly 320 may include a fluid ejection device as described above, including at least one longitudinal array of drop generators perpendicular to the width of the reservoir 310. The drop generators may generate drops of print fluid for printing on a surface.

[0037] In some examples, the first sump 318a extends at a first lateral side of the reservoir 310 and the second sump 318b extends at a second lateral side of the reservoir 310 opposite the first side, at the bottom of the reservoir 310. Flat bottom surfaces on the exterior of the reservoir 310 may be flush with a bottom surface of the fluidic structure assembly 320. In some examples, a depth of the first sump 318a is substantially equal to a height of the fluidic structure assembly 320, plus the height of a fluid output. The reservoir 310 may include the fluid output on a bottom surface of the main print fluid reservoir chamber 311. The fluid output may be configured to supply fluid to the fluidic structure assembly 320. [0038] In some examples, at least one of the first sump 318a and the second sump 318b include a support rib (not shown in FIG. 3) extending from a wall of the reservoir 310 into the first sump 318a. The support rib may be configured to reduce air and/or ink in the first sump volume and/or support the capillary medium 340. The support rib may extend vertically upwards from a bottom wall of the first sump 318a. The support rib may extend horizontally inwards into the first sump 318a from a side wall of the first sump 318a. Examples of the support rib are described in greater detail below.

[0039] FIG. 4 illustrates a perspective view of an example molded body 410. The molded body 410 may include any or any combination of features explained above. The molded body 410 may be molded plastic. The molded body 410 may be monolithic. Walls of the molded body 410 may be liquid-impermeable. The molded body 410 may hold a liquid, such as print fluid. The molded body 410 may define at least one reservoir in an interior of the molded body 410. A shape of the at least one reservoir may be defined by a shape of the molded body 410. The at least one reservoir may have a volume. In some examples, the molded body 410 has a substantially uniform thickness.

[0040] The molded body 410 may include an exterior recess 414. The recess 414 may be formed in the molded body 410 such that a bottom of the molded body 410 forms cheeks 416, with the recess 414 extending inward and upward into the molded body 410 with respect to the bottom, between the cheeks 416. The recess 414 may be recessed into a bottom of the molded body 410. The cheeks 416 may form the bottom of the molded body 410. In some examples, the cheeks 416 are on either side of the recess 414. In some examples, the cheeks 416 extend along an entire length of the recess 414. In some examples, the cheeks 416 have a same width. In some examples, the recess 414 and the cheeks 416 have a same length. In some examples, the recess 414 is symmetrical along its length parallel to the cheeks 416. In some examples, the recess 416 is symmetrical along its width perpendicular to the cheeks. [0041] The molded body 410 includes at least one fluid output 412. The at least one fluid output 412 may output the print fluid to a fluid ejection device (not shown in FIG. 4) connected to the at least one fluid output 412. The at least one fluid output 412 may connect the at least one reservoir to an exterior of the molded body 410. The at least one fluid output 412 may be configured to output the print fluid to the fluid ejection device. The at least one fluid output 412 may be located in the recess 414, extending from the bottom of the reservoir chamber. The at least one fluid output 412 may form a channel in a bottom of the reservoir, protruding from the top surface of the recess next to the cheeks 416. In some examples, the at least one fluid output 412 may extend out of the recess 414. In some examples, the at least one fluid output 412 may extend a distance equal to a depth of the recess 414 such that an edge of the at least one fluid output 412 is flush with the cheeks 416. In some examples, the at least one fluid output 412 connects the at least one reservoir to the exterior of the molded body 410 such that an edge of the at least one fluid output 412 is flush with an external wall of the molded body 410 within the recess 414.

[0042] FIG. 5 illustrates a perspective view of an example fluid ejection device assembly 400 including the molded body 410 of FIG. 4 and an example fluidic structure assembly 420. The fluid ejection device assembly 400 may include a lid 430. The lid 430 may be attached to the molded body 410 to prevent print fluid from escaping the molded body 410.

[0043] The fluidic structure assembly 420 may occupy the recess 414 of the molded body 410. A bottom surface of the fluidic structure assembly 420 may be flush with the cheeks 416. The fluidic structure assembly 420 may include a fluid ejection device 421 including at least one fluid ejection die 422. A fluid ejection die may be a fluidic integrated circuit comprising silicon and fluid channels and switching circuitry. In the example illustrated in FIG. 5, the fluid ejection device 422 includes a single die 422 for ejecting black ink. In the examples illustrated in FIGS. 7-13, the fluid ejection device includes multiple dies for ejecting ink of different colors, each die fluidically connected to a corresponding print fluid reservoir chamber. In an example, the at least one print (i.e., fluid ejection) die 422 includes a cyan die, a yellow die, and a magenta die. The at least one print die 422 may include arrays of drop generators. The at least one print die 422 may extend along a length of the fluid ejection device 421 parallel to the recess 414. The arrays of drop generators may be longitudinal arrays of drop generators parallel to the length of the fluid ejection device 421 and perpendicular to the width of the fluid ejection device 421. In other examples, the fluid ejection device assembly 400 comprises multiple reservoir chambers, each chamber storing a different fluid (for example, cyan, magenta and yellow ink), whereby the fluid ejection device 421 includes, instead of multiple dies, a single die with multiple parallel drop generator arrays, each array to eject one of the fluids, and fluidically connected to a corresponding output and reservoir chamber.

[0044] The fluidic structure assembly 420 may include a flexible circuit 424. The flexible circuit 424 may include circuitry to connect to a printer, to control the at least one print die 422. The flexible circuit 424 may be attached to the molded body 410. The circuitry of the flexible circuit 424 may include contact pads for receiving signals to control the at least one print die 422.

[0045] FIG. 6 illustrates a perspective view of the fluidic structure assembly 420 of FIG. 5. The fluid structure sub assembly 420 may include at least one fluidic interface 426. The at least one fluidic interface 426 may be configured to attach to the at least one fluid output 412 of the molded body 410 such that print fluid is supplied from the at least one reservoir through the at least one fluid output 412 and the at least one fluidic interface 426 to the fluidic structure assembly 420. The at least one fluidic interface 426 may be attached to the at least one fluid output 412. The at least one fluidic interface 426 may supply print fluid to the at least one print die 422. In the examples shown in FIGS. 8 and 12-14, the at least one fluidic interface 426 includes multiple fluidic interfaces. The multiple fluidic interfaces may correspond to fluid outputs of the molded body. The fluid outputs of the molded body may each supply a different color of print fluid. In an example, the fluidic structure assembly 420 includes three fluid interfaces which attach to three fluid outputs of the molded body for supplying cyan, yellow, and magenta ink from the molded body 410 to the fluidic structure assembly 420. The number of the fluid outputs and the fluid interfaces may correspond to a number of dies of the fluid ejection device, or, in other examples the number of fluid outputs and fluid interface may correspond to a number of drop generators in a single (e.g., multi-color) print die. Each fluid interface of the multiple fluid interfaces may supply fluid to a drop generator array of the at least one print die 422.

[0046] The fluidic structure assembly 420 may include a fluidic structure 423, the flexible circuit 424 and the fluid ejection device 421. The fluidic structure 423 may be a single molded support body to which the fluid ejection device 421 and flexible circuit 424 are attached, and at the same time it may conduct the fluid as received from the at least one interface to the respective drop generator array of the fluid ejection device 421. In some examples, the fluidic structure assembly 420 does not include the flexible circuit 424. The fluidic structure assembly 420 may include the fluid ejection device 421. The fluidic structure assembly 420 may be secured to the molded body 410 to receive print fluid from the fluid outputs 412. The fluidic structure assembly 420 may be secured to the molded body 410 to receive print fluid from the at least one fluid output 412 by the at least one fluidic interface 426 being attached to the at least one fluid output 412.

[0047] FIG. 7 illustrates another fluid ejection device assembly 700. The fluid ejection device assembly 700 may include multiple dies for ejecting ink of different colors. In some examples, the fluid ejection device assembly 700 includes a cover 725. The cover 725 may be used to protect a flexible circuit and a fluidic structure assembly. The cover 725 may be removably attached to the fluid ejection device assembly 700. In an example, the cover 725 is attached to the fluid ejection device assembly 700 with an adhesive. In an example, the cover 725 is a strip of tape. The fluid ejection device assembly may include a molded body 710 having a recess 714 and cheeks 716 similar to the molded body 410 of FIG. 4.

[0048] FIG. 8 illustrates an exploded view of the fluid ejection device assembly 700 of FIG.

7. The fluid ejection device assembly 700 may include a flexible circuit adhesive 726 for attaching a flexible circuit 724 to the molded body 710. The fluid ejection device assembly 700 may include an interface adhesive 728 for attaching an interface of the fluidic structure 723 to the molded body 710. In some examples, at least one fluidic interface of the fluidic structure assembly is be attached to at least one fluid output of the molded body 710 by adhesive 728. The fluid ejection device assembly 700 may include a fluid ejection device adhesive 727 for attaching a fluid ejection device 721 to the fluidic structure 723. The fluid ejection device may comprise a rigid compound embedding three print dies. The fluidic structure may comprise three interfaces to connect to three corresponding outputs of three reservoir chambers of the molded body 710.

[0049] FIG. 9 illustrates another exploded view of the fluid ejection device assembly 700 of FIG. 7. The fluid ejection device assembly 700 may include at least one foam body 740 inside of the molded body 710. The at least one foam body 740 may store print fluid within the molded body 710. The at least one foam body 740 may be or include a capillary medium. In some examples, a shape of the at least one foam body 740 may correspond to a shape of a reservoir chamber of the molded body 710 such that the at least one foam body 740 fills the interior of the chamber. In some examples, the at least one foam body 740 fills the interior of the molded body 710 from the lid 730 to the fluid outputs 712, but not the sumps. The at least one foam body 740 may store the print fluid to be output from the molded body 710 through the at least one fluid output 712. The fluid ejection device assembly 700 may be installed or deployed such that the lid 430 is above the molded body 710 and such that gravity pulls the print fluid from the at least one foam body 740 into the at least one fluid output 712, whereas the fluid ejection device may pull fluid from the upstream channels by fluid ejection itself. The fluid ejection device assembly 700 may include filters 472 to filter the print fluid as it passes from the at least one foam body 740 to the at least one fluid output 712.

[0050] In some examples, the at least one foam body 740 includes multiple separate foam bodies, one for each reservoir chamber. The multiple separate foam bodies may store different respective colors of ink as stored in each reservoir chamber of the molded body 710. The molded body 710 may include interior walls defining the reservoir chambers, separating the multiple separate foam bodies. In an example, the at least one foam body 740 stores black print fluid. In another example, the at least one foam body 740 include three separate foam bodies for storing cyan, yellow, and magenta print fluid. The multiple separate foam bodies may have different shapes and/or volumes. The multiple separate foam bodies may extend different distances within the molded body 710 from the lid to the at least one fluid output 712. The multiple separate foam bodies may extend different distances within the molded body 710 from the lid to the at least one fluid output 712 based on different fluid outputs of the at least one fluid output 712 extending different distances in the molded body 710.

[0051] FIG. 10 illustrates a cross-section view of the molded body 710 of the fluid ejection device assembly 700 of FIG. 7. The molded body 710 may include a first reservoir 711a, a second reservoir 711b, and a third reservoir 711c, isolated from each other as different chambers. The molded body may include a first fluid output 712a, a second fluid output 712b, and a third fluid output (not shown), referred to collectively as the fluid outputs 712. The first fluid output 712a of the molded body 710 may connect the first reservoir 71 la to the exterior of the molded body 710. The first fluid output 712a may connect the first reservoir 711a to a first fluid interface of the fluidic structure assembly 720. The second fluid output 712b of the molded body 710 may connect the second reservoir 71 lb to the exterior of the molded body 710. The second fluid output 712b may connect the second reservoir 711b to a second fluid interface of the fluidic structure assembly 720. The third fluid output of the molded body 710 may connect the third reservoir 711c to the exterior of the molded body 710. The third fluid output may connect the third reservoir 711c to a third fluid interface of the fluidic structure assembly 720. The molded body 710 may be installed or deployed in the orientation shown in FIG. 10.

[0052] FIG. 11 illustrates a view of a bottom portion of the molded body 710 of the fluid ejection device assembly 700 of FIG. 7. The recess 714 may include the first fluid output 712a, the second fluid output 712b, and the third fluid output 712c. The molded body 710 may include more or fewer fluid outputs than shown. In some examples, the recess 714 is in a center of the molded body 710. In some examples, the recess 714 is closer to a first side of the molded body 710 such that a first cheek of the cheeks 716 is larger than a second cheek of the cheeks 716.

[0053] FIG. 12 illustrates a perspective view of the fluid ejection device assembly 700 of FIG. 7. The fluid ejection device 721 may include a molded compound carrier with a first die 722a, a second die 722b, and a third die 722c. The first die 722a may receive print fluid from the first reservoir 711a via the first fluid output 712a and the first fluid interface. The second die 722b may receive print fluid from the second reservoir 711b via the second fluid output 712b and the second fluid interface. The third die 722c may receive print fluid from the third reservoir 711c via the third fluid output 712c and the third fluid interface. In an example, the first die 722a outputs cyan print fluid, the second die 722b outputs yellow print fluid, and the third die 722c outputs magenta print fluid. Any of the first die 722a, the second die 722b, and the third die 722c may be used to output any color of print fluid and any combination of colors of print fluid may be used. In other examples, each output 712a, 712b, 712c may be connected to a corresponding drop generator array in a single combined print die that includes multiple parallel longitudinal drop generator arrays.

[0054] FIG. 13 illustrates a bottom view of a portion of the fluid ejection device assembly 700 of FIG. 7. In some examples, the fluidic structure assembly 720 has a length, width, and depth substantially equal to the length, width, and depth, respectively, of the recess 714. In some examples, the fluidic structure assembly 720 has a width substantially equal to the width of the recess 714 such that the fluidic structure assembly 720 extends from a first cheek of the cheeks 716 to a second cheek of the cheeks 716. The fluidic structure assembly 720 may be flush with the cheeks 716 such that, when viewed from the bottom of the molded body 710 as in FIG. 13, the fluidic structure assembly 720 appears to fill the recess 714. The fluidic structure assembly 720 being flush with the cheeks 716 may facilitate wiping of the fluidic structure assembly 720. The cheeks 716 are provided on both lateral sides of the fluidic structure assembly 720, whereby the bottom surfaces of the cheeks 716 and the fluidic structure assembly 720 are approximately flush.

[0055] FIG. 14 illustrates a bottom view of the fluid ejection device assembly 700 of FIG. 7 with some of the features described above.

[0056] FIG. 15 illustrates a perspective view of sumps 718 of the molded body 710 of the fluid ejection device assembly 700 of FIG. 7. The sumps 718 may be formed in the molded body 710 at and below a level of an upper surface of the recess 714. The sumps 718 may be formed in the molded body 710 in portions of the molded body 710 that form the cheeks 716. The sumps 718 may be formed in the molded body 710 in portions of the molded body 710 below an area filled by the at least one foam body 740. The sumps 718 may be formed in the molded body 710 in portions of the molded body below an upper edge of the fluid outputs 712. In some examples, the sumps 718 may be formed in the molded body 710 in portions of the molded body below an upper edge of the first fluid output 712a. The sumps may extend at least partially under the first fluid output 712a. The sumps 718 may be formed in the molded body 710 based on the recess 714 and/or the fluidic structure assembly 720. The sumps 718 may have a depth equal to a depth of the recess 714 and/or a height of the fluidic structure assembly 720.

[0057] The sumps 718 may be open to the reservoir of the molded body 710. In some examples, the sumps 718 are open to the first reservoir 711a. In the illustrated example, the other reservoirs 71 lb, 711c are not connected to sumps. In this example, the sumps 718 only connect to one reservoir, which may be the front reservoir. In other examples, a or each sump could connect to multiple reservoirs. The first reservoir 711a may be a main reservoir chamber, as opposed to a reservoir including the sumps 718. The main reservoir chamber may include a main volume. In some examples, the sumps 718 are symmetric. In some examples, the sumps 718 are asymmetric. The sumps 718 and/or the recess 714 may be sized based on dimensions of the fluidic structure assembly 720. In an example, the recess 714 and the sumps 718 have a depth substantially equal to a height of the fluidic structure assembly 720 such that the fluidic structure assembly 720 is flush with the cheeks 716. The sumps 718 may include a first sump and a second sump corresponding to a first cheek and second cheek of the cheeks 716, respectively.

[0058] In an example, the sumps 718 include a first sump and a second sump below the reservoir and open to the reservoir. In this example, the first sump and the second sump have different shapes and different volumes. In this example, the first sump and the second sump are below a foam body and contain free air and/or print fluid which is soaked up or drawn into the foam body to be output through a fluid output. In this example, the first sump and the second sump are on lateral sides of the reservoir with the fluid output in between the first sump and the second sump, with both sumps extending below the reservoir. [0059] The sumps 718 may be generally cubical-shaped. In other examples, the sumps 718 may by cylindrical. In some examples, the sumps 718 may be cup-shaped. In some examples, the sumps 718 may be trough-shaped. In some examples, the sumps 718 may be V-shaped. In some examples, the shape of the sumps 718 corresponds to a shape of the molded body 710 and/or a shape of the cheeks 716. In some examples, the shape of the sumps 718 does not correspond to the shape of the molded body 710 and/or the shape of the cheeks 716. In an example, the molded body 710 may be cored such that the shape of the sumps 718 does not correspond to the shape of the cheeks 716.

[0060] Discussion of examples illustrated in FIG. 15 may be applied similarly to examples illustrated in any of FIGS. 1 - 6.

[0061] FIG. 16 illustrates a perspective view of the molded body 710 of the fluid ejection device assembly 700 of FIG. 7 including example support ribs 719. The support ribs 719 may be in the sumps 718. The support ribs 719 may protrude into the sumps 718 from walls of the molded body 710. The support ribs 719 may support the at least one foam body 740. The at least one foam body 740 may be configured to soak print fluid from the sumps 718 into the reservoir of the molded body 710 to output the print fluid out of the fluid outputs 712. In some examples, the support ribs 719 may support a first foam body of the at least one foam body 740 in the first reservoir 71 la. The support ribs 719 may support the first foam body such that a bottom of the first foam body extends approximately at the height of the fluid outputs 712. A support rib of the support ribs 719 may extend vertically upwards from a bottom wall of a sump of the sumps 718. A support rib of the support ribs 719 may extend horizontally inwards from a side wall of a sump of the sumps 718. A support rib of the support ribs 719 may extend horizontally inwards from a first side wall of a sump of the sumps 718 to a second side wall of the sump. The sump may include a plurality of side walls, including the first side wall and the second side wall. In some examples, the support rib may extend diagonally from the first side wall to the second side wall. In some examples, the support rib may include a substantially perpendicular bend between the first side wall and the second side wall.

[0062] The support ribs 719 may include a plurality of support ribs, of which extend in a direction different from remaining ones of the plurality of support ribs. The plurality of support ribs may be spaced apart from one another within the sumps 718. The support ribs 719 may be spaced apart in order to prevent sinking in the molded body 710 during the molding process.

[0063] In some examples, the support ribs 719 may be rectangular prisms. In some examples, the support ribs 719 may be rounded protrusions. In some examples, the support ribs 719 may be triangular protrusions. In some examples, the support ribs 719 may be protrusions of various shapes and/or dimensions. The support ribs 719 may be protrusions. In some examples, only a subset of the support ribs 719 support the at least one foam body 740. In an example, a first subset of the support ribs 719 in upper portions of the sumps 718 support the at least one foam body 740 and a second subset of the support ribs 719 in lower portions of the sumps 718 do not support the at least one foam body 740.

[0064] The support ribs 719 may support the foam body 740. The support ribs 719 may be configured to reduce a volume of the sumps 718. The support ribs 719 may be configured to reduce air and/or print fluid in the sumps 718. The at least one foam body 740 may soak the print fluid from the sumps 718 to output the print fluid through the fluid outputs 712. The fluidic structure assembly 720 may be adjacent the sumps 718. In an example, the sumps include a first sump and a second sump. In this example, the fluidic structure assembly 720 may be adjacent the first sump and/or the second sump to receive the print fluid from the reservoir. In this example, the fluidic structure assembly 720 may be between the first sump and the second sump in the recess 714 downstream of the reservoir. [0065] The support ribs 719 may prevent too much sagging of the at least one foam body 740. The support ribs 719 may support the at least one foam body 740 to create a seal between an inside surface of the molded body 710 and the at least one foam body 740. This may prevent any print fluid in the sumps 718 from escaping the molded body 710. The support ribs 719 may allow the at least one foam body to absorb free ink from the sumps 718 via capillary edges. Without the support ribs 719, the at least one foam body 740 may sag into the sumps 718, breaking a seal between the inside surface of the molded body 710 and allowing print fluid from the sumps 718 to escape the molded body 710.

[0066] Although FIG. 16 shows the support ribs 719 only in the first reservoir 71 la, in some examples, the second reservoir 711b and/or the third reservoir 711c may include second reservoir support ribs and third reservoir support ribs, respectively. The second reservoir support ribs and the third reservoir support ribs may be positioned adjacent the second fluid output 712b and third fluid output 712c, respectively. The second reservoir support ribs may be positioned in at least one second reservoir sump adjacent the second fluid output 712b. The third reservoir support ribs may be positioned in at least one third reservoir sump adjacent the third fluid output 712c. The second and third reservoir support ribs may be oriented within their respective sumps similar to the support ribs 719 or other support rib configurations discussed herein. The second and third reservoir support ribs may be oriented identically, symmetrically, or non-symmetrically to each other.

[0067] FIG. 17 illustrates a top interior view of the molded body 710 including the support ribs 719 of FIG. 16. At least one of the support ribs 719 may extend from a bottom wall of the sumps 718. In an example, a support rib extends diagonally upwards from the bottom wall of the first sump At least one of the support ribs 719 may extend from side walls of the sumps 718. In some examples, the sumps 718 include a plurality of side walls. The support ribs 719 may protrude into the sumps 718. At least one of the support ribs 719 may extend from a first side wall 710a to a second side wall 710b of a sump of the sumps 718. In some examples, the support ribs 719 are the same in each of the sumps. In some examples, first support ribs of the support ribs 719 in a first sump of the sumps 718 are symmetric to second support ribs of the support ribs 719 in a second sump of the sumps 718. In some examples, the support ribs 719 are different in each of the sumps 718. In an example, first support ribs of the support ribs 719 in a first sump of the sumps 718 have a different arrangement and/or different number of ribs than second support ribs of the support ribs 719 in a second sump of the sumps 718.

[0068] The support ribs 719 may be spaced within the sumps 718 to prevent sinking in the molded body 710 during the forming process. The support ribs 719 may extend in different directions in order to support the at least one foam body 740 in the molded body 710 despite being spread out within the sumps 718. A number of the support ribs 719 may be based on a spacing of the support ribs 719 as well as a size of the support ribs 719. The size, number, and arrangement of the support ribs 719 in the first sump of the sumps 718 may be different than the size, number, and arrangement of the support ribs 719 in the second sump of the sumps 718. The first sump and second sump of the sumps 718 may be different sizes and/or have different geometries.

[0069] FIG. 18 illustrates a top interior view of the molded body 710 of FIG. 7 including an alternative example arrangement of the support ribs 719. or support ribs of the support ribs 719 may include a gap or lowered portion 719a. In an example, a support rib extends diagonally from the first side wall 710a to the second side wall 710b of the sump, enclosing a comer portion of the sump. In this example, the support rib includes a lowered portion 719a to increase a flow of print fluid between the corner portion and a remainder of the sump.

[0070] FIG. 19 illustrates a perspective view of the molded body 710 of FIG. 7 including the alternative arrangement of the support ribs 719 of FIG. 18. [0071] FIG. 20 illustrates the molded body 710 of FIG. 7 formed with coring to reduce a sump volume. Coring includes inserting cores into a mold before injecting plastic to adjust a shape of the molded body 710. The molded body 710 may be formed using coring in a portion of the sumps 718 to reduce a volume of the sumps. In an example, the molded body 710 is formed using coring in a lower portion of a first sump and a second sump to reduce volumes of the first sump and the second sump. In some examples, the molded body 710 does not include the support ribs 719.

[0072] FIG. 21 illustrates a perspective view of a bottom of the molded body 710 of FIG. 20. The molded body 710 may include pits 717. The pits 717 may serve to prevent sinking in the molded body 710 during the forming process due to coring. The pits 717 may serve to preserve a thickness of the molded body 710 substantially equal. The pits 717 may cause the cheeks 716 to not be flat.

[0073] A molded body for a fluid ejection device assembly may include a reservoir to store print fluid therein. The reservoir may include a main reservoir chamber, a sump under, and open to, the main reservoir chamber, at least one protrusion into the sump to support a foam body in the main reservoir chamber, and a fluid output to output the print fluid to a fluid ejection device.

[0074] An inner volume of the sump may extend at least partially under the fluid output. The main reservoir chamber may include a foam body, the foam body configured to soak the print fluid from the sump into the main reservoir chamber to output the print fluid out of the fluid output. The sump may include a first sump and a second sump open to the main reservoir chamber. The first sump and the second sump may be at lateral sides of the reservoir with the fluid output in between, the first sump and the second sump extending under the main reservoir chamber. A first protrusion of the at least one protrusion may extend vertically upwards from a bottom wall of the sump. A second protrusion of the at least one protrusion may extend horizontally inwards into the sump from a side wall of the sump. The sump may include a plurality of side walls, and a third protrusion of the at least one protrusion may extend from a first side wall of the plurality of side walls to a second side wall of the plurality of side walls. The third protrusion may include a substantially perpendicular bend between the first side wall and the second side wall. The third protrusion may extend diagonally from the first side wall to the second side wall. The at least one protrusion may include a plurality of protrusions, each of the plurality of protrusions extending to different lengths within the sump. The at least one protrusion may include a plurality of protrusions, of the plurality of protrusions extending in a direction different from remaining ones of the plurality of protrusions. The at least one protrusion may include a plurality of protrusions spaced apart from one another within the sump.

[0075] A molded body for a fluid ejection device assembly may include a reservoir to store print fluid therein. The reservoir may include a main volume, a first sump having a first volume under the main volume, wherein an external wall of the first sump forms a first cheek of the molded body, a second sump having a second volume under the main volume, wherein an external wall of the second sump forms a second cheek of the molded body, and a fluid output between the first cheek and the second cheek, the fluid output to output the print fluid to a fluid ejection device that extends between the cheeks. The first cheek and the second cheek may be flush with the fluid ejection device. The molded body may include at least one protrusion in at least one of the first sump or the second sump to support a foam body. The at least one protrusion may include a plurality of support ribs, wherein the plurality of support ribs are spaced within at least one of the first sump or the second sump to prevent sinking in the molded body. A support rib of the plurality of support ribs may extend from a wall of the molded body into the first sump or the second sump, wherein the support rib is configured to support a foam body within the reservoir so that a bottom of the foam body extends approximately at the height of the fluid output. The support rib may extend vertically upwards from a bottom wall of the first sump or the second sump. The support rib may extend horizontally inwards into the first sump or the second sump from a side wall of the first sump or the second sump, respectively. At least one of the first sump and the second sump may include a plurality of side walls, and the support rib may from a first side wall of the plurality of side walls to a second side wall of the plurality of side walls. At least one of the first sump and the second sump may be cylindrical. The molded body may be part of a fluid ejection device assembly including a fluidic structure assembly secured to the molded body to receive the print fluid from the fluid output, the fluidic structure assembly to support, or including, a fluid ejection device. The fluid ejection device assembly may include the fluid ejection device, and the fluid ejection device may be located adjacent to the first sump and/or the second sump to receive the print fluid from the reservoir. The fluidic structure assembly may be arranged at least partially between the first sump and the second sump downstream of the reservoir. The fluid ejection device may be flush with a bottom of the first sump.

[0076] A fluid ejection device assembly may include a reservoir to store print fluid therein. The reservoir may include a main print fluid reservoir chamber including a capillary medium to hold the print fluid, a first sump having a first sump volume, a second sump having a second sump volume, the second sump and the first sump laterally positioned, wherein the first sump and the second sump extend below the capillary medium in an installed condition of the cartridge so that free print fluid in each sump below the capillary medium is drawn into the capillary medium, and a fluidic structure assembly secured to the reservoir below the main print fluid reservoir chamber and positioned laterally between the first sump and the second sump.

[0077] The first sump and the second sump may extend laterally next to each other along a length of the reservoir below the reservoir and at each side of the fluidic structure assembly, and the fluidic structure assembly may include a fluid ejection device including at least one longitudinal array of drop generators perpendicular to the width. The first sump may extend from a first side of the reservoir and the second sump may extend from a second side of the reservoir opposite the first side. A bottom surface on the exterior of the reservoir may be flush with a surface of the fluidic structure assembly. The fluid ejection device assembly may include a fluid output on a bottom surface of the main print fluid reservoir chamber, wherein the fluid output is configured to supply fluid to the fluidic structure assembly. A depth of the first sump may be substantially equal to a height of the fluidic structure assembly. The fluid ejection device assembly may include a support rib extending from a wall of the reservoir into at least one of the first sump or the second sump, and the support rib may configured to reduce air and/or ink in the first sump or the second sump and support the capillary medium. The support rib may extend vertically upwards from a bottom wall of the first sump or the second sump. The support rib may extend horizontally inwards into the first sump or the second sump from a side wall of the first sump or the second sump, respectively.

[0078] The herein described subject matter sometimes illustrates different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely exemplary, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected," or "operably coupled," to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably couplable," to each other to achieve the desired functionality. Specific examples of operably couplable include but are not limited to physically mateable and/or physically interacting components and/or wirelessly interactable and/or wirelessly interacting components and/or logically interacting and/or logically interactable components.

[0079] With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity. For example, recitations of plural elements can be understood to include of the element discussed.

[0080] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as "open" terms (e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (e.g., "a" and/or "an" should typically be interpreted to mean "at least one" or "one or more"); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of "two recitations," without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, or C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "A or B" will be understood to include the possibilities of "A" or "B" or "A and B." Further, unless otherwise noted, the use of the words “approximate,” “about,” “around,” “substantially,” etc., mean plus or minus ten percent.

[0081] The foregoing description of illustrative examples has been presented for purposes of illustration and of description. It is not intended to be exhaustive or limiting with respect to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the disclosed embodiments. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

Claims

WHAT IS CLAIMED IS:

1. A molded body for a fluid ejection device assembly, the molded body comprising: a reservoir to store print fluid therein, the reservoir comprising: a main reservoir chamber; a sump under, and open to, the main reservoir chamber; at least one protrusion into the sump to support a foam body in the main reservoir chamber; and a fluid output to output the print fluid to a fluid ejection device.

2. The molded body of claim 1 wherein an inner volume of the sump extends at least partially under the fluid output.

3. The molded body of claim 1 or 2, comprising a foam body in the main reservoir chamber, the foam body configured to soak the print fluid from the sump into the main reservoir chamber to output the print fluid out of the fluid output.

4. The molded body of any preceding claim, wherein the sump comprises a first sump and a second sump open to the main reservoir chamber.

5. The molded body of claim 4, wherein the first sump and the second sump are at lateral sides of the reservoir with the fluid output in between, the first sump and the second sump extending under the main reservoir chamber.

6. The molded body of any preceding claim, wherein a first protrusion of the at least one protrusion extends vertically upwards from a bottom wall of the sump.

7. The molded body of any preceding claim, wherein a second protrusion of the at least one protrusion extends horizontally inwards into the sump from a side wall of the sump.

8. The molded body of any preceding claim, wherein the sump comprises a plurality of side walls, and wherein a third protrusion of the at least one protrusion extends from a first side wall of the plurality of side walls to a second side wall of the plurality of side walls.

9. The molded body of claim 8, wherein the third protrusion comprises a substantially perpendicular bend between the first side wall and the second side wall.

10. The molded body of claim 8 or 9, wherein the third protrusion extends diagonally from the first side wall to the second side wall.

11. The molded body of any preceding claim, wherein the at least one protrusion comprises a plurality of protrusions, each of the plurality of protrusions extending to different lengths within the sump.

12. The molded body of any preceding claim, wherein the at least one protrusion comprises a plurality of protrusions, of the plurality of protrusions extending in a direction different from remaining ones of the plurality of protrusions.

13. The molded body of any preceding claim, wherein the at least one protrusion comprises a plurality of protrusions spaced apart from one another within the sump.

14. The molded body of any preceding claim, wherein the reservoir comprises: a second reservoir chamber, separate from the main reservoir chamber, the second reservoir chamber to store a second print fluid; and a third reservoir chamber, separate from the main reservoir chamber, the third reservoir chamber to store a third print fluid.

15. The molded body of claim 14, wherein the sump is open to only the main reservoir chamber.

16. The molded body of claim 15, further comprising a second support rib extending into a second sump of the second print fluid reservoir chamber.

17. A molded body for a fluid ejection device assembly, the molded body comprising: a reservoir to store print fluid therein, the reservoir comprising: a main volume; a first sump having a first volume under the main volume, wherein an external wall of the first sump forms a first cheek of the molded body; a second sump having a second volume under the main volume, wherein an external wall of the second sump forms a second cheek of the molded body; and a fluid output between the first cheek and the second cheek, the fluid output to output the print fluid to a fluid ejection device that extends between the cheeks.

18. The molded body of claim 17, wherein the first cheek and the second cheek are flush with the fluid ejection device.

19. The molded body of claim 17 or 18, further comprising at least one protrusion in at least one of the first sump or the second sump to support a foam body.

20. The molded body of claim 19, wherein the at least one protrusion comprises a plurality of support ribs, wherein the plurality of support ribs are spaced within at least one of the first sump or the second sump to prevent sinking in the molded body.

21. The molded body of claim 20, wherein a support rib of the plurality of support ribs extends from a wall of the molded body into the first sump or the second sump, wherein the support rib is configured to support a foam body within the reservoir so that a bottom of the foam body extends approximately at the height of the fluid output.

22. The molded body of claim 21, wherein the support rib extends vertically upwards from a bottom wall of the first sump or the second sump.

23. The molded body of any of claim 21 or 22, wherein the support rib extends horizontally inwards into the first sump or the second sump from a side wall of the first sump or the second sump, respectively.

24. The molded body of any of claims 20 - 23, wherein at least one of the first sump and the second sump comprises a plurality of side walls, and wherein the support rib extends from a first side wall of the plurality of side walls to a second side wall of the plurality of side walls.

25. The molded body of any of claims 17 - 22, wherein at least one of the first sump and the second sump is cylindrical.

26. The molded body of any of claims 17-25, wherein the reservoir comprises: a second volume, separate from the main volume, the second volume to store a second print fluid; and a third volume, separate from the main volume, the third reservoir chamber to store a third print fluid.

27. The molded body of claim 26, wherein the first sump and the second sump are open to only the main volume.

28. The molded body of claim 27, further comprising a second support rib extending into a third sump of the second print fluid reservoir chamber.

29. A fluid ejection device assembly comprising the molded body of any preceding claim and a fluidic structure assembly secured to the molded body to receive the print fluid from the fluid output, the fluidic structure assembly to support, or including, the fluid ejection device.

30. The molded body of claim 29, wherein the fluid ejection device assembly comprises the fluid ejection device, and wherein the fluid ejection device is located adjacent to the first sump and/or the second sump to receive the print fluid from the reservoir.

31. The molded body of claim 30, wherein the fluidic structure assembly is arranged at least partially between the first sump and the second sump downstream of the reservoir.

32. The molded body of any of claims 29 - 31, wherein the fluid ejection device is flush with an adjacent external surface of the molded body.

33. A fluid ejection device assembly comprising: a reservoir to store print fluid therein, the reservoir comprising: a main print fluid reservoir chamber comprising a capillary medium to hold the print fluid; a first sump having a first sump volume; a second sump having a second sump volume, the second sump and the first sump laterally positioned, wherein the first sump and the second sump extend below the capillary medium in an installed condition of the cartridge so that free print fluid in each sump below the capillary medium is drawn into the capillary medium; and a fluidic structure assembly secured to the reservoir below the main print fluid reservoir chamber and positioned laterally between the first sump and the second sump.

34. The fluid ejection device assembly of claim 33, wherein the first sump, and the second sump extend laterally next to each other along a length of the reservoir below the reservoir and at each side of the fluidic structure assembly, and wherein the fluidic structure assembly comprises a fluidic structure and a fluid ejection device including at least one longitudinal array of drop generators extending perpendicular to the lateral direction.

35. The fluid ejection device assembly of claim 33 or 34, wherein the first sump extends from a first side of the reservoir and the second sump extends from a second side of the reservoir opposite the first side.

36. The fluid ejection device assembly of any of claims 33-35, wherein a bottom surface on the exterior of the reservoir is flush with a surface of the fluidic structure assembly.

37. The fluid ejection device assembly of any of claims 33-36, further comprising a fluid output on a bottom surface of the main print fluid reservoir chamber, wherein the fluid output is configured to supply fluid to the fluidic structure assembly.

38. The fluid ejection device assembly of any of claims 33-37, wherein a depth of the first sump is substantially equal to a height of the fluidic structure assembly.

39. The fluid ejection device assembly of any of claims 33-38, further comprising a support rib extending from a wall of the reservoir into at least one of the first sump or the second sump, wherein the support rib is configured to reduce air and/or ink in the first sump or the second sump and support the capillary medium.

40. The fluid ejection device assembly of claim 39, wherein the support rib extends vertically upwards from a bottom wall of the first sump or the second sump.

41. The fluid ejection device assembly of claim 39, wherein the support rib extends horizontally inwards into the first sump or the second sump from a side wall of the first sump or the second sump, respectively.

42. The molded body of any of claims 33-41, wherein the reservoir comprises: a second print fluid reservoir chamber, separate from the main print fluid reservoir chamber, the second print fluid reservoir chamber to store a second print fluid; and a third print fluid reservoir chamber, separate from the main print fluid reservoir chamber, the third print fluid reservoir chamber to store a third print fluid.

43. The molded body of claim 42, wherein the first sump and the second sump are open to only the main print fluid reservoir chamber.

44. The molded body of claim 43, further comprising a second support rib extending into a third sump of the second print fluid reservoir chamber.