CN217495200U

CN217495200U - Printing screen assembly for three-dimensional printer and three-dimensional printer

Info

Publication number: CN217495200U
Application number: CN202220481765.1U
Authority: CN
Inventors: 毛宇航; 邓新桥
Original assignee: Shenzhen Anycubic Technology Co Ltd
Current assignee: Shenzhen Anycubic Technology Co Ltd
Priority date: 2021-12-20
Filing date: 2022-03-04
Publication date: 2022-09-27
Anticipated expiration: 2032-03-04

Abstract

The application discloses a print screen subassembly and three-dimensional inkjet printer for three-dimensional inkjet printer can reduce the condition that the display screen main part produced the damage because of receiving the drawing of patterns effect to improve the life of display screen main part. The print screen assembly in this application includes: a protection component and a display screen component; the protection component comprises a first layer plate, the display screen component comprises a display screen main body, the first layer plate is arranged above or below the display screen main body, and the first layer plate is adhered or attached to the display screen main body in an adsorption mode.

Description

Printing screen assembly for three-dimensional printer and three-dimensional printer

Technical Field

The application relates to the technical field of three-dimensional printing, in particular to a printing screen assembly for a three-dimensional printer and the three-dimensional printer.

Background

With the continuous development of science and technology and society, the application of three-dimensional printing technology tends to be extensive. Among them, the stereolithography technique of the bottom projection system has been widely focused on its advantage of high-precision printing.

In the existing photocuring three-dimensional printing technology of a lower projection mode, light is irradiated from bottom to top, each layer of image on a platform generates photopolymerization reaction and is cured in a very thin area of a resin layer to form a formed thin layer of a formed part, the formed thin layer is separated from a release film on a printing screen by moving the platform upwards, and then the curing of the next resin layer is continued to form the next formed thin layer, so that a three-dimensional body with multiple layers of photocuring formed thin layers is printed.

But because during shaping thin layer photocuring shaping, probably have certain degree viscidity between type membrane and the shaping thin layer, when the shaping thin layer with from the type membrane separation, according to the object balance principle of force when static relatively, shaping thin layer and from the release film between the mould release force probably can make the printing screen receive the power of dragging that corresponds with this power of demoulding, should drag the power and probably can make the printing screen produce slight deformation with the surface of leaving the type membrane contact to influence the life of printing screen.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the application provides a printing screen assembly for a three-dimensional printer and the three-dimensional printer, which can reduce the damage of the printing screen caused by the action of a demolding force, thereby prolonging the service life of the printing screen, and the following example is specifically referred to.

The present application provides in a first aspect a printing screen assembly for a three-dimensional printer, comprising: a protection component and a display screen component; wherein, the protection subassembly includes first plywood, the display screen subassembly includes the display screen main part, first plywood set up in the top or the below of display screen main part, and first plywood with display screen main part adhesion or adsorption and lamination.

Optionally, the first laminate has a stiffness higher than that of the display screen body, or the first laminate has a stiffness higher than that of a support layer in the display screen body;

or,

the thickness of the first layer plate is larger than that of the display screen main body, or the thickness of the first layer plate is larger than that of the supporting layer in the display screen main body.

Optionally, the surface area of the first laminate is greater than or equal to the area of the image display region of the display screen main body.

Optionally, the first laminate is attached to the display screen body by optical adhesive.

The area of the area where the optical cement is laid is smaller than or equal to the surface area of the side, opposite to the optical cement, of the display screen main body.

Optionally, the first ply has a thickness of 0.55mm to 3 mm.

Optionally, when the first layer plate is located below the display screen main body, a scratch-resistant layer is arranged above the display screen main body.

Optionally, the display screen main body is a black and white display screen main body, and the first layer plate is a transparent plate.

Wherein, the first laminate is a toughened glass plate or an acrylic plate.

The application second aspect provides a three-dimensional inkjet printer, including printer main part and Z axle subassembly, the Z axle subassembly set up in on the printer main part, the printer main part includes the printing screen subassembly of any one of the aforesaid.

According to the technical scheme, the method has the following advantages:

first plywood sets up in the top or the below of display screen main part, and first plywood and display screen main part adhesion or absorption laminating, adhesion or adsorption between through first plywood and the display screen main part, first plywood is an overall structure with the laminating of display screen main part, drawing of patterns produces the drawing of patterns power between release film and the shaping thin layer when being located on this overall structure, and when drawing the power that corresponds to this overall structure effect, the first plywood of laminating in the display screen main part can share and bear this and draw the power, thereby fix the display screen main part, reduce the condition that the display screen main part produced the damage because of the atress of drawing of patterns power, the service life of improvement display screen main part.

Drawings

In order to more clearly illustrate the technical solutions in the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is an exploded perspective view of a print screen assembly according to the present application;

FIG. 2 is a bottom view of the construction of a print screen assembly of the present application;

FIG. 3 is a schematic partial cross-sectional view of a print screen assembly of the present application;

fig. 4 is an exploded perspective view of a three-dimensional printer according to the present application.

Detailed Description

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for explaining relative positional relationships between the respective members or components, and do not particularly limit specific mounting orientations of the respective members or components.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In addition, the structures, the proportions, the sizes, and the like, which are illustrated in the accompanying drawings and described in the present application, are intended to be considered illustrative and not restrictive, and therefore, not limiting, since those skilled in the art will understand and read the present application, it is understood that any modifications of the structures, changes in the proportions, or adjustments in the sizes, which are not necessarily essential to the practice of the present application, are intended to be within the scope of the present disclosure without affecting the efficacy and attainment of the same.

The application provides a print screen subassembly and three-dimensional inkjet printer for three-dimensional inkjet printer can reduce the display screen main part and produce the condition of damaging because of receiving the drawing of patterns effect to improve the life of display screen main part.

Specifically, the printing screen assembly for the three-dimensional printer is referred to as the printing screen assembly hereinafter.

Referring to fig. 1 and 3, the printing screen assembly of the present application includes: the protection component 1 and the display screen component 2; wherein, protection subassembly 1 includes first plywood 11, and display screen subassembly 2 includes display screen main part 21, and first plywood 11 sets up in the top or the below of display screen main part 21 to first plywood 11 and display screen main part 21 adhesion or absorption laminating.

The printing screen assembly is suitable for a photocuring three-dimensional printing process, and the photocuring three-dimensional printer adopting the following projection mode is taken as an example for explanation. The working principle of the display screen main body 21 is as follows: ultraviolet light projects on the display screen main body 21 from bottom to top, cover the ultraviolet light through the display screen main body 21 and illuminate the cross section of the three-dimensional printing area, namely, part of the ultraviolet light penetrates through the display screen main body 21 and the release film to irradiate on the liquid photosensitive resin corresponding to the gap between the lifting platform and the display screen main body 21 in the trough, so that the ultraviolet light is cured, the cured resin moves upwards for a fixed height along with the lifting platform, the forming thin layer is fixed on the lifting platform and separated from the release film, then the lifting platform moves in the thickness distance of the forming thin layer, a new gap between the forming thin layer and the release film can be filled with the liquid photosensitive resin, then the lower-layer curing is carried out, and the whole part is completed.

Wherein, display screen main part 21 installs the silo bottom that sets up on the printer under normal condition, and first floor 11's luminousness is good to make the lower part light source see through display screen main part 21 and first floor 11 provide the energy to the liquid photosensitive resin of silo bottom, thereby carry out the photocuring and print, this silo refers to the device that is used for holding liquid photosensitive resin.

The display main body 21 is mainly used for covering ultraviolet rays or enabling the ultraviolet rays to penetrate through the display main body 21 so as to provide energy for the curing process of the liquid photosensitive resin in the material tank, so that photocuring printing of a corresponding three-dimensional printing area part is performed, and a resin forming thin layer is formed, wherein the display main body 21 covers the ultraviolet rays or can enable the area through which the ultraviolet rays penetrate to be an image display area of the display main body 21. In short, the basic principle of photo-curing printing is to polymerize a liquid photosensitive resin such as epoxy acrylic resin at a high speed into a solid state by irradiation of ultraviolet light with a certain wavelength, and then to cure the solid photosensitive resin to form a molded thin layer. It will be appreciated that each of the shaping sheets is the base surface for the next shaping sheet, i.e. a plurality of shaping sheets may form a three-dimensional object.

Wherein, the solidified thin layer is required to be upwardly drawn away from the position contacting with the display screen main body 21, so as to provide a solidifying position for the next thin layer, so as to solidify the printing of the next thin layer at the bottom of the last thin layer, and a release film is usually disposed on the surface of one side of the display screen main body 21 contacting with the liquid photosensitive resin material, so as to facilitate the upwardly drawing away of the thin layer.

In this application, first plywood 11 sets up in the top or the below of display screen main part 21, and first plywood 11 and display screen main part 21 adhesion or adsorption laminating, adhesion or adsorption between through first plywood 11 and display screen main part 21, first plywood 11 and the laminating of display screen main part 21 are an overall structure, drawing of patterns produces the die release force between type membrane and the shaping thin layer when being located this overall structure, and when the power of dragging that corresponds to this overall structure effect, the first plywood 11 of laminating on display screen main part 21 can share and bear this and drag the power, thereby fix display screen main part 21, reduce display screen main part 21 because of receiving the circumstances that the die release power acted on and produced the damage, improve display screen main part 21's life.

The first layer plate 11 is disposed above the display main body 21 or below the display main body 21.

When the first laminate 11 is located above the display main body 21, that is, the first laminate 11 is located above the display main body 21 and close to one side of the trough, one side of the first laminate 11 contacts with the trough, and the other side is attached to the upper surface side of the display main body 21, it can be understood that, under the above arrangement, the position where the light-cured forming thin layer is formed is located on one side of the upper surface of the first laminate 11, that is, the position where the light-cured forming thin layer is formed corresponds to the position where the light-cured forming thin layer in the trough, and the release film is arranged at the position so as to facilitate the separation of the forming thin layer, the pulling force corresponding to the demolding force of the forming thin layer and the release film directly acts on the upper surface of the first laminate 11, and the first laminate 11 has certain rigidity, that the capability of resisting elastic deformation when stressed is strong, the first laminate 11 is not easy to deform under stress, and can reduce the deformation damage of the display main body 21 caused by the demolding force, meanwhile, the first layer plate 11 is positioned above the display screen main body 21, so that the display screen main body 21 can be protected and prevented from being scratched, and the service life of the display screen main body 21 is prolonged.

When the first laminate 11 is located under the display main body 21, that is, the first laminate 11 is located at a position on one side of the lower surface of the display main body 21 close to the light source and attached to the lower surface of the display main body 21, under the above arrangement, the position where the light is cured to form the thin molding layer is located at the position of the upper surface of the display main body 21, and a release film is disposed at the position so as to facilitate the detachment of the thin molding layer, and a pulling force corresponding to a mold release force of the thin molding layer and the release film is directly applied to the upper surface of the display main body 21, so that the first laminate 11 adsorbed or adhered to the lower surface of the display main body 21 can fix the lower surface of the display main body 21, and thus, according to the stiffness property of the display main body 21 itself, the upper surface of the display main body 21, which may be deformed by the mold release force, can be fixed by the lower surface of the display main body 21 fixed by the first laminate 11, the condition that the stress deformation damage to the upper surface of the display screen main body 21 caused by the pulling force corresponding to the demolding force can be reduced, and therefore the service life of the display screen main body 21 is prolonged.

The connection mode of the first laminate 11 and the display main body 21 in the present application may be an adhesion mode or an adsorption mode, for example, in a mode of attaching the first laminate 11 and the display main body 21 by an adsorption mode, the first laminate 11 and the display main body 21 may be attached by physical vacuum adsorption, and the vacuum environment between the first laminate 11 and the display main body 21 is utilized to attach and connect with the air pressure difference of the outside air, or the first laminate 11 and the display main body 21 are attached and connected by a chemical adsorption mode, and the specific adsorption connection mode is not limited here.

In one embodiment, the rigidity of the first layer plate 11 is higher than that of the display screen main body 21, or the rigidity of the first layer plate 11 is higher than that of the support layer in the display screen main body 21;

or,

the thickness of the first layer 11 is greater than the thickness of the display main body 21, or the thickness of the first layer 11 is greater than the thickness of the support layer in the display main body 21.

The rigidity refers to the ability of a material or a structure to resist elastic deformation when stressed, and the first layer plate 11 is adhered or adsorbed on the display screen main body 21 so that the first layer plate 11 and the display screen main body 21 form an integral structure, and thus the first layer plate 11 with higher rigidity fixes the display screen main body 21 with lower rigidity, so as to improve the integral rigidity performance and prolong the service life of the display screen main body 21.

In addition, the thickness of the display screen main body 21 is generally smaller, and the thickness of the first layer plate 11 is larger than that of the display screen main body 21, so that the requirement that the first layer plate 11 reaches the preset strength can be met as much as possible, the first layer plate 11 is adhered and connected to the display screen main body 21, and the strength of the display screen main body 21 is improved. Further, as the thickness of the first laminate 11 increases, the effect against the external force increases to protect the display main body 21.

In one embodiment, the surface area of the first sheet 11 is greater than or equal to the area of the image display area of the display main body 21.

For example, the surface area of the first layer board 11 is equal to the area of the image display area of the display screen main body 21, that is, the first layer board 11 can be just matched with the outer side of the image display area of the display screen main body 21, so that the first layer board 11 can fix the image display area of the display screen main body 21 as much as possible, and in addition, the surface area of the first layer board 11 can be larger than the area of the image display area of the display screen main body 21, so that the part of the first layer board 11, which exceeds the image display area of the display screen main body 21, is connected with a structural member of the three-dimensional printer, on which the printing screen assembly is mounted, so as to fix the display screen main body 21 more stably, and thus the strength of the display screen main body 21 is improved.

In one embodiment, the first layer plate 11 is adhered to the display screen main body 21 by the optical adhesive 3. The optical adhesive 3 has the characteristics of being colorless and transparent, having the light transmittance of more than 90 percent, having good bonding strength, having small curing shrinkage and the like, and can be well adapted to the three-dimensional printing process. It should be noted that the thickness of the optical adhesive 3 is generally about 0.175 mm, which is limited by the influence of the blocking factor and the viscosity of the ultraviolet light during the photo-curing process.

The area of the area where the optical cement 3 is laid is smaller than or equal to the surface area of the side, opposite to the optical cement 3, of the display screen main body 21.

It can be understood that the optical adhesive 3 is a connecting medium between the display screen main body 21 and the first laminate 11, and is used for enabling the first laminate 11 to be attached to the display screen main body 21, and then the area of the area where the optical adhesive 3 is laid is smaller than or equal to the surface area of the display screen main body 21 facing to the side of the optical adhesive 3, so that the situation that the area of the area where the optical adhesive 3 is laid exceeds the surface area of the display screen main body 21 facing to the side of the optical adhesive 3, and no adhesive substance is arranged on the side of the optical adhesive 3, so that the optical adhesive is directly exposed outside can be reduced, and the pollution of the exposed part of the optical adhesive 3 to the photosensitive resin in the trough can be reduced, or the situation that the exposed part of the optical adhesive 3 is polluted by external dust and water vapor. Further, since the optical paste 3 has a good adhesive strength, when the area of the region where the optical paste 3 is applied is smaller than the surface area of the display main body 21 on the side facing the optical paste 3, it can be understood that a small amount of the optical paste 3 is used, and when the display main body 21 or the first sheet 11 is not entirely covered with the optical paste 3, the both can be adhered to each other.

It should be noted that the surface area of the display main body 21 facing the optical adhesive 3 may be the area of the entire plane of the surface of the display main body 21 facing the optical adhesive 3, or may be the area of the image display area of the display main body 21 facing the optical adhesive 3.

In another embodiment, the first layer plate 11 and the display panel main body 21 may be adhered together by using a double-sided adhesive tape, specifically, the double-sided adhesive tape surrounds the outer side of the non-image display area of the display panel main body 21 so as to adhere the display panel main body 21 and the first layer plate 11. It can be understood that since the first laminate 11 has a good fixing effect on the display main body 21 above the display main body 21 and a small releasing force is applied when the size of the display main body 21 is small, a simple adhesive fixing between the first laminate 11 and the display main body 21 can be performed by surrounding the outside of the non-image display area of the display main body 21 by using a double-sided tape.

In one embodiment, the first ply 11 has a thickness of 0.55mm to 3 mm.

It can be understood that, as can be seen from the calculation formula of the material strength, the strength of the first layer plate 11 is increased as the thickness of the first layer plate 11 becomes thicker, and since the strength of the first layer plate 11 is in a positive correlation with the fixing degree of the first layer plate 11 to the display main body 21, the fixing effect of the first layer plate 11 to the display main body 21 is increased as the thickness of the first layer plate 11 is increased under the same other conditions. In addition, since impurities inevitably exist in the first laminate 11, the light is more hindered by the impurities in the first laminate 11 as the thickness of the first laminate 11 increases, so that the light transmittance of the first laminate 11 becomes smaller as the thickness of the first laminate becomes thicker.

As can be seen from the above, the light transmittance of the first layer 11 and the strength of the fixing support of the first layer 11 are mutually restricted, and in order to ensure that the strength of the first layer 11 is within the predetermined strength and the light transmittance is also within the predetermined light transmittance as much as possible, the thickness of the first layer 11 is in a range of 0.55mm to 3 mm.

In the face of different requirements or different transmittance and intensity within a preset threshold range, the thickness range of the first layer plate 11 may be classified, for example: the first sheet 11 may have a thickness ranging from 0.55mm to 0.85mm, 0.85mm to 1.15mm, 1.15mm to 1.45mm, 1.45mm to 1.95mm, 1.95mm to 2.25mm, 2.25mm to 2.55mm, 2.55mm to 2.85mm, or 2.85mm to 3mm, the thickness of the first sheet 11 may be reduced to some extent in order to accommodate a higher required transmittance, ranging from 0.55mm to 0.85mm, 0.85mm to 1.15mm, 1.15mm to 1.45mm, and 1.45mm to 1.95mm, and the thickness of the first sheet 11 may be increased to some extent in order to accommodate a higher required fixed supporting strength to the display main body 21, ranging from 1.95mm to 2.25mm, 2.25mm to 2.55mm, 2.55mm to 2.85mm, or 2.85mm to 3mm, wherein the increased thicknesses of the first sheet 11 and the supporting strength of the first sheet may be in a state where the increased thicknesses of the first sheet 11 mm and the supporting strength of the first sheet are in a state where the increased by 8mm and the light transmittance are balanced, so that the first layer board 11 has better fixed supporting strength and light transmittance at the same time.

In one embodiment, when the first laminate 11 is located below the display main body 21, a scratch-resistant layer is disposed above the display main body 21.

The scratch-resistant layer has a similar function to that of the first layer plate above the display screen main body 21 in the above description, and covers the upper surface of the display screen main body 21 to protect the display screen main body 21 so as to reduce the damage or scratch of the display screen main body 21 caused by external collision or friction.

In one embodiment, the display panel body 21 is a black and white display panel, and the first layer plate 11 is a transparent plate.

It can be understood that, compare in traditional color display screen, color filter and backlight have been removed to black and white display screen, optimize the adjustment polaroid, optimize and adjust the aperture opening ratio, make the light source provide the required energy of resin solidification in the shorter time, can promote the efficiency of printing, in addition, because black and white screen's light transmissivity is stronger, the light that can permeate through is more, and the thermal diffusivity is just better, and to a certain extent, also can prolong the life of printer. The first layer plate 11 is a transparent plate, and specifically, the first layer plate 11 has a good light transmittance, for example, the light transmittance of the first layer plate 11 is 70% or more than 90% to reduce the blocking effect on the ultraviolet light, so that the light source can provide the energy required by resin curing in a shorter time, and the printing efficiency is improved.

Wherein, the first laminate 11 is a tempered glass plate or an acrylic plate. The tempered glass is a prestressed glass, in order to improve the strength of the glass, a chemical or physical method is generally used, a compressive stress is formed on the surface of the glass, and the glass firstly counteracts the surface stress when bearing an external force, so that the bearing capacity is improved, the self pressure resistance, the impact resistance and the like of the glass are enhanced, the strength of the tempered glass is improved by a plurality of times compared with that of the common glass, and the tempered glass is bending-resistant and can be well applied to the three-dimensional printing process. The first layer plate 11 can also be an acrylic plate, and similarly to the above, the acrylic plate has good weather resistance and acid and alkali resistance, does not generate yellowing and hydrolysis phenomena due to long-term water or sunshine infringement, has the characteristics of long service life, good light transmittance, over 92 percent, strong impact resistance, half lighter than common glass and the like, and has good adaptability in the aspect of three-dimensional printing application.

In other embodiments, the present application further provides a print screen assembly comprising: the protection component 1 and the display screen component 2; wherein, protection subassembly 1 includes first plywood 11, and display screen subassembly 2 includes display screen main part 21, and first plywood 11 sets up in the top or the below of display screen main part 21 to first plywood 11 and display screen main part 21 adhesion or absorption laminating.

Wherein the rigidity of the first layer plate 11 is higher than that of the display screen main body 21, or the rigidity of the first layer plate 11 is higher than that of the support layer in the display screen main body 21;

or,

the thickness of the first layer plate 11 is larger than that of the display screen main body 21, or the thickness of the first layer plate 11 is larger than that of the support layer in the display screen main body 21.

Wherein the surface area of the first laminate 11 is greater than or equal to the area of the image display region of the display main body 21.

Wherein, the first layer plate 11 is adhered to the display screen main body 21 through the optical cement 3.

Wherein the thickness of the first laminate 11 is 0.55mm to 3 mm.

When the first layer plate 11 is positioned below the display screen main body 21, a scratch-resistant layer is arranged above the display screen main body 21.

The display screen main body 21 is a black and white display screen main body, and the first layer plate 11 is a transparent plate.

Wherein, the first laminate 11 is a tempered glass plate or an acrylic plate.

Referring to fig. 4, the present application further provides a three-dimensional printer, which includes a printer main body 4 and a Z-axis assembly 5, where the Z-axis assembly 5 is disposed on the printer main body 4, and the printer main body 4 includes any one of the above printing screen assemblies.

It should be noted that the above-mentioned application contents and the specific embodiments are intended to demonstrate the practical application of the technical solutions provided in the present application, and should not be construed as limiting the scope of protection of the present application. Various modifications, equivalent substitutions, or improvements may be made by those skilled in the art within the spirit and principles of the present application. The protection scope of this application is subject to the appended claims.

Claims

1. A print screen assembly for a three-dimensional printer, comprising:

a protection component and a display screen component; wherein, the protection subassembly includes first plywood, the display screen subassembly includes the display screen main part, first plywood set up in the top or the below of display screen main part, and first plywood with display screen main part adhesion or adsorption and lamination.

2. A print screen assembly according to claim 1, wherein the first layer has a stiffness higher than the stiffness of the display screen body or the first layer has a stiffness higher than the stiffness of a support layer in the display screen body;

or,

the thickness of the first layer plate is larger than that of the display screen main body, or the thickness of the first layer plate is larger than that of a supporting layer in the display screen main body.

3. A print screen assembly according to claim 1, wherein the surface area of the first sheet is greater than or equal to the area of the image display region of the display screen body.

4. A print screen assembly according to claim 1, wherein the first sheet is attached to the display screen body by optical glue.

5. A print screen assembly according to claim 4, wherein the area of the area over which the optical paste is applied is less than or equal to the surface area of the side of the display screen body facing the optical paste.

6. A print screen assembly according to claim 1, wherein the first sheet has a thickness of from 0.55mm to 3 mm.

7. A print screen assembly according to claim 1, wherein a scratch resistant layer is provided over the display screen body when the first laminar is positioned beneath the display screen body.

8. The screen assembly of any one of claims 1 to 7, wherein the screen body is a black and white screen body and the first sheet is a transparent sheet.

9. A print screen assembly according to claim 8, wherein the first ply is a toughened glass sheet or an acrylic sheet.

10. A three-dimensional printer comprising a printer body and a Z-axis assembly disposed on the printer body, wherein the printer body comprises the print screen assembly of any one of claims 1 to 9.