JP6454810B1 - Hot end for 3D modeling equipment - Google Patents

Abstract

A hot end for a 3D printer and a 3D printer provided with the hot end for achieving energy saving while obtaining a strong bond between stacked modeling materials.
SOLUTION: A supply unit in which a supply port for supplying a filament-shaped modeling material is formed, a melting unit having a heating unit for heating and melting (heating and melting) the filament supplied from the supply port, and discharging the melted filament Conventionally, in a hot end for a 3D printer having a discharge portion in which a discharge port is formed, in order to lower the temperature in the supply portion of the filament (modeling material), heat dissipation means such as a heat radiating fin on the supply portion side of the melting portion The area where the heat remaining due to the melting of the filament will be laminated by providing the heat dissipating part that dissipates heat from the melting part to the discharge part side than the melting part. It can be reused for heating (the surface of the model).
[Selection] Figure 1

Description

  The present invention relates to a modeling material ejection head (hot end) for a three-dimensional modeling apparatus (3D printer) and a 3D printer including the same.

  In recent years, manufacturing a three-dimensional model using a computer with a 3D printer has been actively performed. As a hot end (dispensing device for dispensing thermoplastic material) for such a 3D printer, a main body including a channel having a longitudinal axis, and a modeling material (filament) in at least a part of the channel A main body heater for heating to a flowable state and a head portion connected to an end of the flow path, having a discharge port that communicates with the flow path and discharges the heated material. There has been proposed a heating device including the head unit and a peripheral path surrounding the head unit, the heating device heating the region surrounded by the peripheral path (Patent Document 1). . According to this hot end, the material discharged from the hot end is maintained at an appropriate temperature by the heating device, and the area where the discharged material is deposited is also preheated to an appropriate temperature. Since the modeling material discharged on the modeled object can be stacked, a strong bond between the stacked modeled materials can be obtained, and a three-dimensional modeled object having a solid structure can be obtained.

International Publication No. 2018/012112

  However, in the conventional hot end disclosed in Patent Document 1, the main body heater that melts the modeling material and the heating material that preheats the discharged material and the area where the discharged material is deposited are separated. In addition to the necessity of heating means, fins are provided as heat dissipation means at the top of the main body to make it difficult for the heat from the main body heater to be transferred to the modeling material supply side, and in some cases it is necessary to dissipate heat by a fan It is extremely inefficient in energy. In particular, when a high melting point material such as a super engineering plastic such as PEEK is used as a modeling material, the amount of heat to be dissipated increases, resulting in a further reduction in energy efficiency.

  The present invention has been made in view of such circumstances, and includes a hot end for a 3D printer that achieves energy saving while obtaining a strong bond between modeling materials laminated by preheating, and the same. An object is to provide a 3D printer.

  The hot end for the 3D printer of the present invention includes a supply unit in which a supply port for supplying a filamentous modeling material is formed, and a heating unit for melting (melting) the modeling material supplied from the supply port. A hot end for a 3D printer comprising: a melting portion having a discharge portion; and a discharge portion in which a discharge port for discharging the modeling material melted in the melting portion is formed. In addition, a heat dissipating part for dissipating heat by the heating means is provided.

  According to this hot end, the heat dissipating part is provided on the discharge port side of the melting part, and the residual heat of the heat used for melting the modeling material at the time of stacking the modeling material is used to heat the surface of the modeling object from the heat dissipating part. Can be used. As a result, it is possible to create a modeling object having a strong connection between the stacked modeling materials, and since heat is effectively used and heat is not dissipated wastefully, further energy saving can be achieved.

  In the hot end of the present invention, the lower surface (surface on the discharge port side) of the heat radiating portion may be blackened (formation of a film such as graphite) and / or the surface area increased (unevenness processing).

  The 3D printer of the present invention includes the above-described hot end of the present invention.

  According to the hot end of the present invention, it is possible to carry out the preliminary heating of the area in which the modeling material is stacked, which has been performed in the conventional hot end, without using a dedicated heating means. That is, since the surplus heat used for melting the modeling material in the melting part, which has been thrown away by heat dissipation, can be reused for heating in the vicinity of the discharge area (modeling object surface) of the modeling material to be laminated, It is possible to improve the bonding strength between the modeling materials to be laminated, to save energy in the driving energy of the hot end, and to save energy in the 3D printer. In addition, according to the present invention, since the vicinity of the discharge region of the modeling material can be locally heated, it is possible to discharge and laminate the discharge ports in all directions without choosing the stacking direction. The degree of freedom in designing the 3D printer can be improved.

It is (A) sectional drawing of the hot end of one Embodiment of this invention, and (B) bottom view. It is (A) sectional drawing and (B) bottom view of the hot end of other embodiment of this invention. The top view of the (A) holder of the heat block which is a modification of the heating means used for the hot end of this invention, (B) The side view of a holder, and (C) The top view of the state which attached the heating head to the holder is there. (A) It is a bottom view of the nozzle to which a heat block is attached, and (B) It is sectional drawing of the state which attached the heat block to the nozzle.

  Hereinafter, a hot end (a discharge head for a modeling material) for a 3D printer of the present invention will be described with reference to the drawings. FIG. 1 shows a hot end HE1 which is an embodiment of the present invention. The hot end HE1 includes a nozzle 11 having a discharge portion in which a discharge port 11a for discharging a melted modeling material is formed at the lower end (lower side of the drawing) and a melting portion for melting the modeling material, and a filament at the upper end (upper side of the drawing). (Linear modeling material) Barrel 12 having a supply portion in which supply port 12 a is formed, a pair of heating heads 13 that are heating means of the melting portion of nozzle 11, and nozzle 11 are formed so as to be in contact therewith. And a heat radiating plate (heat radiating portion) 14 formed so as to surround the discharge portion of the nozzle 11 in contact with the cover 15. In the hot end HE1, a passage 17 that connects the supply port 12a and the discharge port 11a in a straight line is formed inside the nozzle 11 and the barrel 12.

  The barrel 12 has a double structure of a cylindrical outer tube 121 and an inner tube 122, and the filament supplied from the supply port 12 a formed at the upper end of the outer tube 121, which is a supply unit, is supplied to the nozzle 11. A guide passage 17 is formed. The lower part of the outer tube 121 is screwed into the upper part of the nozzle 11.

  A pair of slit-like (longitudinal) openings 121 a are formed in the middle portion of the outer tube 121 so as to face each other. The inner diameter of the outer tube 121 is formed to have a relatively large passage diameter upward from the lower end opening, and has a relatively small passage diameter constituting the supply port 12a at the upper end portion. As the material of the outer tube 121, for example, metals, ceramics, glass, and the like can be widely used, and among them, a material having low thermal conductivity is preferable. For example, titanium alloy, SUS, quartz glass, etc. are used, and when engineering ceramics or machinable ceramics are used, those having low thermal conductivity are selected.

  Further, the inner tube 122 has an outer diameter that can be inserted from the lower end opening of the outer tube 121, and has a cylindrical shape in which the passage 17 is formed in the length direction. The material of the inner tube 122 is also preferably a material having a low thermal conductivity, but in terms of the relationship with the outer tube 121, it is more preferable to use a material having a thermal conductivity lower than that of the outer tube 121. The inner tube 122 can be formed of a material having low thermal conductivity such as titanium alloy, engineering ceramics, machinable ceramics, quartz glass, borosilicate glass, polyimide resin, etc., among which transparent or translucent quartz glass Is more preferable. By using a transparent or translucent material, the inside of the passage 17 can be visually recognized from the opening 121a of the outer tube 121, and the state of the filament supplied into the passage 17 can be observed.

  Since the barrel 12 has a double structure of the outer tube 121 and the inner tube 122 having a lower thermal conductivity than the outer tube 121, and since the opening 121a is provided in the outer tube 121, the heat from the nozzle 11 Can be effectively suppressed, and the temperature in the passage 17 of the barrel 12 can be kept relatively low. In particular, the portion where the opening 121a of the outer tube 121 is formed functions as a heat insulating portion in which heat conduction from the nozzle 11 to the supply port 12a side is suppressed. In this portion, the inner tube 122 may be formed with a thinner side surface or an opening in order to enhance its heat insulating function.

  In the present embodiment, a pair of openings 121a and 121a are formed in the middle portion of the outer tube 121 in the barrel 12, but instead, the entire middle portion of the outer tube 121 is eliminated and the inner tube is removed. The upper portion and the lower portion of 122 may be separately covered with the upper outer tube and the lower outer tube.

  The nozzle 11 has a tapered discharge portion provided with a discharge port 11a at the tip, and a melting portion in which a pair of heating heads 13 and 13 are mounted facing the left and right direction near the discharge port 11a in the middle. Is formed. The upper part of the nozzle 11 has a cylindrical shape that is formed thick to attach the barrel 12, the lower part is a substantially prismatic cylinder (rectangular cylinder) that is cut from the left-right direction, and the tip is provided to be tapered. It has been. A portion of the nozzle 11 to which the heating heads 13 and 13 are attached is further provided with a flat portion cut out from the left and right sides, and leads 131 (lines) are led out from the heating heads 13 and 13 attached to the flat portion. Has been.

  As the material of the nozzle 11, metals, ceramics, and the like can be widely used. However, a material having a thermal conductivity higher than that of the barrel 12 is preferable, and a metal is more preferable. More specifically, for example, stainless steel, brass, iron, copper, aluminum and the like can be used more preferably.

  As a heating means for melting the modeling material (filament), for example, a conventionally known device such as a heating head or a heat block in which a heating resistor layer is formed on an insulating substrate can be widely used. It is preferable to use a heating head that is excellent in terms of weight reduction and high responsiveness. The heating head (heating member) 13 attached to the flat portion of the nozzle 11 that is the melting portion in the example shown in FIG. 1 is formed on, for example, a rectangular plate-like alumina zirconia ceramic substrate (insulating substrate) and the surface of the insulating substrate. The strip-shaped thick film-formed heating resistor and 2 formed eccentrically at one end along the length direction of the insulating substrate so as to be connected to both ends of the heating resistor on the surface of the insulating substrate. Has two electrodes. The surface of the heating resistor may be coated with a protective layer (dielectric layer) such as glass containing a filler. The heating head 13 is attached so that the surface of the insulating substrate on which the heating resistor is not formed faces the flat portion of the nozzle 11.

  The heating head 13 may be divided into the length direction of the nozzle 11 (vertical direction in the drawing) and a plurality of heating heads may be mounted, and the plurality of heating heads can be controlled to be heated to different temperatures or different heating / lowering patterns. It may be. Further, by adding an electrode in the middle (intermediate) of the heating resistor of the heating head 13 and pulling out another lead from this, it can be controlled separately as two heating resistors, or the two heating heads 13 can be controlled separately. , 13 may be controlled by pulling out leads so as to connect the heating resistors in parallel, or the heating heads 13 and 13 can be controlled separately. Furthermore, a plurality of heating resistors may be formed on the insulating substrate of the heating head 13 so as to be controlled in common or separately.

  The cover 15 has a bottomed cylindrical shape, the nozzle 11 is inserted through the upper opening, and the tip (discharge portion) of the nozzle 11 where the discharge port 11a is formed protrudes from the opening formed on the bottom surface. The entire side surface of the nozzle 11 is covered. The material of the cover 15 is preferably a material having high thermal conductivity so as to transmit the heat of the nozzle 11 heated by the heating head 13 to the heat radiating portion (heat radiating plate) 14. Good workability such as aluminum and stainless steel is preferable. Metal can be used. The cover 15 is extended to a large outer diameter portion at the top of the nozzle 11 in order to conduct the heat of the nozzle 11 to the heat radiating plate 14, and is in contact with the outer diameter portion or through the high thermal conductivity material. Preferably, it is mounted in contact with at least a portion of. A heat insulating material may be filled between the cover 15 and the nozzle 11 and the heating head 13. The cover 15 is formed with a through hole for leading the lead 131 connected to the heating head 13 to the outside of the cover 15 as necessary.

  The heat dissipating part in the hot end of the present invention melts at the same time as it dissipates heat in order to suppress conduction of excess heat supplied by the heating means to the side to which the modeling material is supplied for melting the modeling material. It has a function of heating the area where the modeling material is discharged. The shape of the heat radiating portion can be, for example, a plate shape, a block shape or the like, but is not particularly limited. In the case of a plate shape, for example, a circular shape, an elliptical shape, a rectangular shape, a polygonal shape, a semicircular shape, and the like can be used. The size and shape of the heat radiating part can be appropriately determined in relation to the amount of heat radiation to the area where the modeling material is discharged, the melting (dissolution, softening) temperature of the modeling material, the modeling speed, and the like.

  In the example shown in FIG. 1, the heat radiating portion (heat radiating plate) 14 is formed in a disk shape, and the tip portion (discharge portion) of the nozzle 11 is inserted into the center portion to protrude in the direction of discharging the modeling material. An opening 14a is provided. The heat radiating plate 14 is attached to the bottom surface of the cover 15 by, for example, four screws 18 so as to surround the tip portion of the nozzle 11. Further, on the lower surface of the heat radiating plate 14 (the surface on the side from which the tip of the nozzle 11 protrudes), for example, four large and small ring-shaped groove portions 14b are formed around the opening 14a. The inner surface on the outer peripheral side of each groove portion 14 b is formed as an inclined surface facing the center side of the heat radiating plate 14. The inclined surface is formed at a gentle angle with respect to the horizontal plane by the groove portion 14b closer to the center (small diameter), and is formed so as to be steeper as the outer groove portion 14b is formed. By forming the inclined surface in the groove portion 14b in this way, the radiant heat from the heat sink can be effectively concentrated on the region where the modeling material in the vicinity of the discharge surface of the modeling material is deposited, and the heating centered directly below the discharge port 11a. A temperature gradient can be formed.

  The shape, size, and material of the heat radiating plate 14 are appropriately determined in consideration of a desired heating temperature or the like in the region where the modeling material is discharged. The thickness dimension of the heat sink 14 can be, for example, about 0.1 to 3.0 mm, and the diameter of the heat sink 14 can be, for example, about 20 to 50 mm. The shape of the heat radiating plate 14 may be an arbitrary shape such as an elliptical shape or a polygonal shape. Further, as long as the moving direction of the hot end HE1 provided with the heat radiating plate 14 during the molding operation can be changed by a rotating mechanism or the like, a structure that protrudes only to a part of the periphery of the discharge port 11a may be used.

  The material of the heat sink 14 is preferably a material having a high thermal emissivity, and is preferably a material excellent in workability from the viewpoint of forming the groove 14b. For example, ceramics such as silicon carbide, silicon nitride, and aluminum nitride, and metals such as aluminum, copper, and stainless steel can be used. Further, in order to efficiently perform heat radiation from the heat radiating plate 14 instead of the groove portion 14b, for example, a plurality of dimples are provided on the lower surface of the heat radiating plate or the surface of the heat radiating plate 14 is reduced by roughening. It may be increased, or it may be blackened such as by forming a graphite film on the lower surface, an oxide film may be formed, or these may be used in combination. Good. Thus, by providing a concavo-convex portion or the like on the lower surface of the heat sink 14, there is an effect that air turbulence easily occurs between the surface of the molded object and the heat sink 14, and more effective heating of the surface of the molded object. It can be performed. In addition, it is good also considering the lower surface of the heat sink 14 as a smooth surface.

  A heat insulating layer may be formed on the exposed upper surface of the heat sink 14. The heat insulating layer may be formed by applying or sticking a heat insulating material having a relatively low thermal conductivity, or may be structural. A structural thing is formed between the upper surface of the heat sink 14 and a plate-shaped body formed by providing a plate-shaped body (heat | fever reflecting plate) via the spacer on the upper surface of the heat sink 14, for example. Insulated spaces can be mentioned. Heat radiation to the upper surface side (hot end supply port 12a side) of the heat radiating plate 14 is suppressed by the heat insulating layer, and heat radiation to the lower surface side is efficiently performed.

  Next, a hot end (a discharge head for a modeling material) for a 3D printer according to another embodiment of the present invention will be described with reference to FIG. The hot end HE2 of FIG. 2 includes a discharge portion having a discharge port 21a for discharging a melted modeling material at a lower end (lower side of the drawing), a nozzle 21 having a melting portion for melting the modeling material, and a heat dissipation portion 21b, and an upper end ( A barrel 22 (supply part) in which a filament (linear modeling material) supply port 22 a is formed on the upper side of the drawing, a pair of heating heads 23 that are means for heating the melting part of the nozzle 21, and the nozzle 21. And a cover 25 formed so as to surround it and a heat insulating spacer 26 (heat insulating portion). In the hot end HE2, a passage 27 that connects the supply port 22a and the discharge port 21a in a straight line is formed in the nozzle 21, the barrel 22, and the heat insulating spacer 26. The present embodiment is characterized in that the heat radiating portion 21 b is formed integrally with the nozzle 21.

  The barrel 22 has a cylindrical shape in which a passage 27 for guiding a filament (modeling material) supplied from a supply port 22a formed at the upper end, which is a supply unit, to the nozzle 21 is formed. The lower part of the barrel 22 is screwed to the upper part of the nozzle 21 via a heat insulating spacer 26.

  As the material of the barrel 22, for example, metal, ceramics, glass, and the like can be widely used. However, the thermal conductivity is relatively low from the viewpoint of suppressing conduction of heat from the nozzle 21 to the supply port 22 a side. Preferably a material is used. For example, a titanium alloy, stainless steel, quartz glass, or the like can be used. When engineering ceramics or machinable ceramics are used, those having a relatively low thermal conductivity are selected. The heat insulating spacer 26 is formed in a bottomed cylindrical shape whose inner diameter substantially coincides with the outer diameter of the barrel 22, and a hole constituting a part of the passage 27 is formed at the center of the bottom. The heat insulating spacer 26 is provided as a heat insulating portion for suppressing heat conduction from the nozzle 21 to the barrel 22, and the material thereof is, for example, heat conduction of titanium alloy, quartz glass, borosilicate glass, polyimide resin, or the like. A material with a low rate can be used. Further, it can be formed from engineering ceramics or machinable ceramics having a relatively low thermal conductivity. In the case where the barrel 22 is made of a material having a low thermal conductivity that can sufficiently insulate the heat generated by the heating of the heating head 23 of the nozzle 21, the heat insulating spacer 26 can be dispensed with.

  The nozzle 21 has a tapered discharge portion with a discharge port 21a provided at the tip, and a cylindrical portion with a heating portion 23 and 23 attached facing the left and right sides near the discharge port 21a in the middle. It is said that. The part to which the barrel 22 and the heat insulating spacer 26 at the upper part of the nozzle 21 are attached is formed in a thick cylindrical shape, and the lower part from this part has a cylinder diameter substantially equal to that of the barrel 22. Further, a portion (melting portion) of the nozzle 21 to which the heating heads 23 and 23 are attached is provided with a flat portion cut out from the left and right, and leads (from the heating heads 23 and 23 attached to the flat portion) Line 231 is derived. As the material of the nozzle 21, a material having high thermal conductivity is preferably used in order to efficiently transmit heat from the heating head 23 to the modeling material of the passage 27, and for example, metal, ceramics, glass, or the like is used. Can do.

  The heat dissipating part 21b is formed in a disk shape with the tip of the discharge part protruding from the center, and is formed under the heating head 23 so as to project or come into contact with the heat dissipating part 21b. A ring-shaped groove centered on the discharge port 21a can be formed on the lower surface (surface on the discharge port 21a side) of the heat dissipation unit 21b, similarly to the heat dissipation plate 14b in FIG. Further, by providing a plurality of dimples instead of the groove portion, the area of the lower surface of the heat radiating portion 21b may be increased, the surface of the lower surface may be blackened, or these may be used in combination. May be. The size and shape of the heat radiating portion 21b can be appropriately determined in consideration of a desired heating temperature or the like of the region where the modeling material is discharged.

  Since the heat radiating part 21b is formed integrally with the nozzle 21, the heat given from the heating head 23 to the nozzle 21 can be efficiently conducted to the heat radiating part 21b to radiate heat. That is, the residual heat of the nozzle 21 can be effectively used for heating the region where the modeling material is discharged. The heat dissipating part 21b and the nozzle 21 may be integrally molded, or may be separately molded and bonded by an inorganic bonding material. Since the nozzle 21 can be heated to about 500 ° C. depending on the type of modeling material, it is preferable to use a material having a heat-resistant temperature of 500 ° C. or more as the inorganic bonding material. For example, a silver brazing material, a copper brazing material, and an aluminum brazing material can be used. In addition, the heat radiating portion 21b in the example shown in FIG. 2 may be provided with a heat insulating layer on the upper surface in order to efficiently radiate heat from the lower surface, similarly to the heat radiating plate 14 in the example shown in FIG.

  The cover 25 has a cylindrical shape and is provided so as to cover from the upper end portion of the nozzle 21 to the melting portion where the heating head 23 is provided. The heat radiating portion 21b is provided so as to be in contact with or close to the heat radiating portion 21b. As a material of the cover 25, when the cover 25 is provided so as to come into contact with the heat radiating portion 21b, a material having high thermal conductivity is preferable in order to transmit the heat of the upper portion of the heated nozzle 21 to the heat radiating portion 21b. . For example, a metal with good workability such as aluminum or stainless steel can be used. As described above, the cover 25 has a large outer diameter at the upper part of the nozzle 21 in order to conduct heat of the nozzle 21 particularly to the heat radiating part 21b or to prevent heat from being transmitted from the upper part of the nozzle 21 to the barrel 22. It is preferably extended to a part and attached so as to be in contact with a part of the surface of the nozzle 21 directly or through a high thermal conductivity material. The cover 25 may be formed with a through hole for leading the lead 231 connected to the heating head to the outside of the cover 25 as necessary.

  3 and 4 show a modification of the heating means used in the hot end of the present invention. As shown in FIG. 3C, the heat block HB as a heating means has a holder 31 and a pair of heating heads 33. As shown in FIGS. 3 (A) and 3 (B), the holder 31 has a prismatic shape whose outer shape viewed from the top and side surfaces is a rectangle. The holder 31 is formed with a vertical through hole 31a that penetrates in the vertical direction and has an upper opening 31a1 at the upper end and a lower opening 31a2 at the lower end. A hot end nozzle is inserted and attached to the vertical through hole 31a. As shown in FIG. 4B, the tip of the nozzle 111 is inserted from the upper opening 31a1, and the tip of the nozzle 111 is attached so as to protrude from the lower opening 31a2.

  In addition, as shown in FIG. 3B, the holder 31 has a total of 10 horizontal through holes 31b penetrating between the opposing side surfaces, 5 in the vertical direction at the left and right ends with the vertical through hole 31a interposed therebetween. Individuals are formed. As shown in the top view of the heat block HB in FIG. 3C, the heating heads 33, 33 are brought into contact with the opposing side surfaces of the holder 31, and the through holes 33 a provided in the heating head 33 have the holder 31. It arrange | positions so that it may overlap with the horizontal through-hole 31b. A wire (conductive wire) 34 is inserted into the through-hole 33a, the lateral through-hole 31b, and the through-hole 33a, and both ends of the wire 34 are bound on the narrow side surface of the holder 31, and the holder 31 is attached to the heating head 33 from both sides. The heating heads 33 and 33 are fixed to the holder 31 so as to be sandwiched between them. The wire 34 may have a role of conducting between the electrodes connected to the heating resistor layers of the pair of heating heads 33, 33 in addition to the role of fixing the heating head 33 to the holder 31. In addition, in the through hole 33a of the heating head 33, for example, a conductive paste such as a silver paste is filled and baked as necessary.

  As with the heating heads 13 and 23 shown in FIGS. 1 and 2, the heating head 33 includes a heating resistor layer formed on an insulating substrate and an electrode formed to apply a voltage to the heating resistor layer. The electrode is formed so as to face the periphery of the through-hole 33a, and is attached to the side surface of the holder 31 with the surface of the insulating substrate on which the heating resistor layer is not formed in contact.

  The material of the holder 31 is preferably a material having high thermal conductivity such as aluminum, copper, or iron. The holder 31 is heated by the heating head 33 and transfers heat from the inner wall of the vertical through hole 31a to the nozzle 111 inserted through the vertical through hole 31a.

  FIG. 4A shows a view of the nozzle 111 that is inserted through the heat block HB and heated, as viewed from the bottom side. FIG. 4B is a cross-sectional view showing a state where the nozzle 111 is inserted through the holder 31 of the heat block HB and attached.

  The nozzle 111 has a thick cylindrical upper end portion provided with a mounting hole to which a barrel is attached, a prismatic melting portion extending downward from the central portion of the lower surface of the upper end portion, and a distal end portion that is narrowed to form a discharge port 111a. And a formed discharge portion. The nozzle 111 has a passage 117 communicating with the discharge port 111a at the tip (lower end) of the discharge portion (nozzle 111) from the bottom surface of the mounting hole at the upper end portion through the melting portion. The heat block HB is attached to the nozzle 111 such that the inner wall surface of the vertical through hole 31 a abuts the outer peripheral surface of the melting portion of the nozzle 111. In addition, a barrel, a cover, and a heat radiation part can be attached to the attachment hole at the upper end of the nozzle 111, for example, in the same manner as in the example shown in FIG.

HE1, HE2 Hot end 11, 21, 111 Nozzle 11a, 21a Discharge port 12, 22 Barrel 12a, 22a Supply port 121 Outer tube 121a Open 122 Inner tube 13, 23, 33 Heating head 131, 231 Lead 14, 21b Heat radiation part ( Heat sink)
14a opening 14b groove 15, 25 cover 17, 27, 117 passage 18 screw 26 heat insulating spacer HB heat block 31 holder 31a vertical through hole 31a1 upper opening 31a2 lower opening 31b horizontal through hole 33a through hole 34 wire 111a discharge port

Claims (3)

A supply unit in which a supply port for supplying a filamentous modeling material is formed;
A melting part having a heating means for melting the modeling material supplied from the supply part;
A discharge part formed with a discharge port for discharging the modeling material melted in the melting part,
A hot end for a 3D printer, characterized in that a heat radiating part for radiating heat by the heating means is provided on the discharge part side of the heating means.   The hot end for a 3D printer according to claim 1, wherein the lower surface of the heat radiating portion is blackened and / or the surface area is increased.   A 3D printer comprising the hot end according to claim 1.

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