Filtering structure, extrusion kit and stereolithography apparatus

Abstract

The application provides a filtering structure, an extrusion kit and a stereoscopic printing device. The filtering structure is used for filtering granular consumables sent by a feeding assembly to an extrusion assembly. The filtering structure comprises a storage box and a filtering assembly. A storage cavity is arranged in the storage box. One end of the storage cavity is communicated with the feeding assembly, used for receiving a feeding airflow carrying the granular consumables. The other end of the storage cavity is communicated with the extrusion assembly, used for sending the received granular consumables to the extrusion assembly. At least one side of the storage box is provided with an exhaust hole communicated with the storage cavity. The filtering assembly is arranged on the side of the storage box provided with the exhaust hole. The filtering assembly is configured to filter the feeding airflow discharged from the exhaust hole.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, and in particular to a filter structure, an extrusion kit, and a 3D printing device. Background Technology

[0002] When 3D printing equipment feeds granular consumables to the extrusion unit, most of them have a filter structure at the hopper or feed tube where the granular consumables are stored. The filter structure increases the feeding resistance, which makes the feeding of granular consumables less continuous and smooth, and may even cause blockage. Utility Model Content

[0003] This application provides a filter structure, an extrusion kit, and a stereolithography device to solve the problem that the filter structure in the known technology causes insufficient and unsmooth feeding, or even blockage.

[0004] This application provides a filtering structure for filtering granular consumables fed from a feeding assembly to an extrusion assembly. The filtering structure includes a storage box and a filtering assembly. The storage box has a storage chamber, one end of which is connected to the feeding assembly to receive the feeding airflow carrying the granular consumables, and the other end of which is connected to the extrusion assembly to feed the received granular consumables to the extrusion assembly. At least one side of the storage box has an exhaust port connected to the storage chamber. The filtering assembly is located on the side of the storage box with the exhaust port and is configured to filter the feeding airflow discharged from the exhaust port.

[0005] In one possible implementation, the diameter of the vent hole is smaller than the particle size of the particulate consumable.

[0006] In one possible implementation, the filter assembly is detachably connected to the storage box.

[0007] In one possible implementation, the storage box has a mounting portion on at least one side, the mounting portion has a mounting cavity, the mounting cavity communicates with the vent hole, and the filter assembly is at least partially located within the mounting cavity.

[0008] In one possible implementation, the mounting part is connected to the storage box on the side near the storage box, and the mounting part and the storage box together form the mounting cavity. An air vent is provided on the side of the mounting part away from the storage box, and the air vent communicates with the mounting cavity.

[0009] In one possible implementation, the filter assembly is clamped between the storage box and the mounting portion.

[0010] In one possible implementation, the filter assembly includes a mounting member and a filter element, the mounting member being at least partially located within the mounting cavity, the filter element being connected to a portion of the mounting member located within the mounting cavity, and the filter element being configured to filter the feed airflow flowing from the exhaust port to the air outlet.

[0011] In one possible implementation, one end of the mounting portion has an inlet / outlet, which communicates with the mounting cavity, and the filter assembly can enter or leave the mounting cavity through the inlet / outlet.

[0012] In one possible implementation, along a first direction, one end of the storage box has a feed inlet, and the other end of the storage box has a discharge outlet, with the axis of the discharge outlet forming an angle with the first direction.

[0013] In one possible implementation, the storage box is configured to be connected to one side of the extrusion assembly, and the discharge port is located on the side of the storage box near the extrusion assembly.

[0014] In one possible implementation, along the first direction, the bottom wall of the storage chamber at the end away from the inlet is provided as a guide surface, which is configured to guide the granular consumables piled thereon toward the outlet.

[0015] In one possible implementation, the filter structure further includes a movable plate, the material guide surface has a discharge port that communicates with the storage chamber, and the movable plate is movably connected to the storage box for opening or closing the discharge port.

[0016] This application also provides an extrusion kit, including an extrusion assembly and the above-described filter structure, the filter structure being connected to the extrusion assembly.

[0017] This application also provides a stereolithography apparatus, including the above-described filter structure or the above-described extrusion kit.

[0018] The filtration structure of this application includes a storage box between the feeding assembly and the extrusion assembly. The storage box can temporarily store the granular consumables conveyed by the feeding assembly through the feeding airflow. After the feeding airflow delivers the granular consumables to the storage box, the feeding airflow can be discharged from the exhaust port. During the discharge process, the feeding airflow will carry away dust and other impurities carried by the granular consumables, thereby filtering the granular consumables entering the extrusion assembly. The filtration assembly absorbs the dust and other impurities carried out by the feeding airflow to avoid contaminating other components of the printing equipment and affecting the indoor environment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the extrusion kit of this application in one embodiment.

[0020] Figure 2 This is a schematic diagram of the filtering structure of this application in one embodiment.

[0021] Figure 3 This is an exploded view of the filtering structure of this application in one embodiment.

[0022] Figure 4 for Figure 2 A cross-sectional schematic diagram of the filter structure along the IV-IV direction.

[0023] Figure 5 for Figure 2 A cross-sectional view of the filter structure along the V-V direction.

[0024] Figure 6 This is a schematic diagram of the structure of the stereoscopic printing device of this application in one embodiment.

[0025] Key component symbols: 300, 3D printing equipment; 200, extrusion kit; 100, filter structure; Z, first direction; X, second direction; Y, third direction; P, guide surface; 10, storage box; 101, storage cavity; 11, first box body; 110, first cavity; 111, feed inlet; 112, vent; 113, observation port; 12, second box body; 120, second cavity; 121, discharge port; 122, unloading port. ; 123, Feeding section; 1230, Guide protrusion; 13, Mounting section; 130, Air outlet; 131, Mounting cavity; 132, Inlet and outlet; 14, Connecting plate; 20, Filter assembly; 21, Mounting component; 210, Mounting groove; 22, Filter component; 30, Feeding assembly; 31, Feeder; 32, Negative pressure device; 40, Extrusion assembly; 50, Movable plate; 51, Sliding protrusion; 52, Sliding groove; 60, Transparent component; 70, Frame.

[0026] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0027] The following description will refer to the accompanying drawings to provide a more complete picture of the present application. The drawings illustrate exemplary embodiments of the present application. However, the present application may be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals denote the same or similar components.

[0028] The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to limit the application. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are intended to also include the plural forms. Furthermore, when used herein, “comprising” and / or “including” and / or “having,” integers, steps, operations, components, and / or components, but does not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components, and / or groups thereof.

[0029] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Furthermore, unless expressly defined herein, terms such as those defined in a general dictionary should be interpreted as having the same meaning as they have in the relevant art and in the content of this application, and will not be interpreted as having an idealized or overly formal meaning.

[0030] When 3D printing equipment feeds granular consumables to the extrusion unit, most of them have a filter structure at the hopper or feed tube where the granular consumables are stored. The filter structure increases the feeding resistance, which makes the feeding of granular consumables less continuous and smooth, and may even cause blockage.

[0031] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0032] like Figures 1 to 3 As shown, this embodiment provides a filter structure 100 for filtering the granular consumables fed from the feeding assembly 30 to the extrusion assembly 40. The granular consumables are granular materials, and they are generally used in FGF (Fused Granular Fabrication) 3D printing. Granular consumables contain a large amount of material dust, which can easily lead to dust accumulation in the nozzle and dust overflow, affecting the printing platform and polluting the indoor environment.

[0033] The feeding assembly 30 transports granular consumables by generating a feeding airflow, specifically a negative pressure airflow, to feed the material via negative pressure feeding. The feeding assembly 30 includes a feeder 31 and a negative pressure device 32. The negative pressure device 32 generates the feeding airflow, which carries the consumables conveyed by the feeder 31. The extrusion assembly 40 melts the granular consumables and delivers them to the nozzle.

[0034] The filter structure 100 includes a storage box 10 and a filter assembly 20. The storage box 10 has a storage chamber 101. One end of the storage chamber 101 is connected to the feeding assembly 30 for receiving the feeding airflow carrying granular consumables, and the other end of the storage chamber 101 is connected to the extrusion assembly 40 for feeding the received granular consumables to the extrusion assembly 40. At least one side of the storage box 10 has an exhaust port 112, which is connected to the storage chamber 101. The feeding airflow can be discharged from the storage chamber 101 through the exhaust port 112 to prevent the internal pressure of the storage chamber 101 from increasing and affecting the feeding. The filter assembly 20 is located on the side of the storage box 10 with the exhaust port 112. The filter assembly 20 is configured to filter the feeding airflow discharged from the exhaust port 112 to absorb dust and other impurities carried away by the feeding airflow from the granular consumables.

[0035] Thus, the filter structure 100 of this application provides a storage box 10 between the feeding assembly 30 and the extrusion assembly 40. The storage box 10 can temporarily store the granular consumables conveyed by the feeding assembly 30 through the feeding airflow. After the feeding airflow delivers the granular consumables to the storage box 10, the feeding airflow can be discharged from the exhaust port 112. During the discharge process, the feeding airflow will carry away the dust and other impurities carried by the granular consumables, thereby filtering the granular consumables entering the extrusion assembly 40. The filter assembly 20 absorbs the dust and other impurities carried out by the feeding airflow to avoid contaminating other components of the printing equipment and affecting the indoor environment.

[0036] For ease of reading, this application introduces the terms first direction Z, second direction X, and third direction Y to describe the embodiments of this application. The first direction Z, second direction X, and third direction Y can be three non-parallel straight lines in space; further, the first direction Z, second direction X, and third direction Y can be three mutually perpendicular directions in a three-dimensional coordinate system (a three-dimensional Cartesian coordinate system). In subsequent embodiments, the first direction Z is described as the Z-axis direction of the three-dimensional coordinate system, the second direction X as the X-axis direction of the three-dimensional coordinate system, and the third direction Y as the Y-axis direction of the three-dimensional coordinate system.

[0037] Please combine Figures 1 to 4 In one embodiment, the storage box 10 includes a first box body 11 and a second box body 12. Along the first direction Z, the second box body 12 is detachably connected to the bottom end of the first box body 11, and the second box body 12 is used to connect the extrusion assembly 40.

[0038] The first box 11 has a roughly rectangular cross-sectional shape and is positioned along the first direction Z. A first cavity 110 is formed at the end of the first box 11 near the second box 12. The second box 12 has a roughly isosceles trapezoidal cross-sectional shape and a second cavity 120 is formed at the end of the second box 12 near the first box 11. When the second box 12 is connected to the first box 11, the second cavity 120 communicates with the first cavity 110, so that the second cavity 120 and the first cavity 110 together constitute the aforementioned storage cavity 101.

[0039] The storage box 10 also includes a connecting plate 14, part of which is located within the first cavity 110, and the other part of which is located within the second cavity 120. The portion of the connecting plate 14 located within the first cavity 110 is connected to the inner wall of the first box 11, and the portion of the connecting plate 14 located within the second cavity 120 is connected to the inner wall of the second box 12. The connecting plate 14 is detachably connected to one of the first box 11 and the second box 12 by fasteners such as bolts, while the other is integrally formed.

[0040] It is understood that in other embodiments, the connecting plate 14 can be detachably connected to the first housing 11 and the second housing 12 by fasteners such as bolts.

[0041] Thus, the second box 12 is detachably connected to the extrusion assembly 40, and the first box 11 is detachably connected to the second box 12. When it is necessary to replace the corresponding storage box 10 based on different extrusion assemblies 40, it is only necessary to separate the first box 11 and the second box 12 and replace the second box 12 corresponding to the extrusion assembly 40, without having to replace the first box 11, thereby improving the applicability of the storage box 10 and reducing costs.

[0042] Please combine Figures 1 to 4 In one embodiment, along the first direction Z, one end of the storage box 10 is provided with a feed inlet 111, and the other end of the storage box 10 is provided with a discharge outlet 121. The axis of the discharge outlet 121 is set at an angle to the first direction Z.

[0043] The feed inlet 111 is located at the end of the first housing 11 away from the second housing 12, specifically on the side wall of the end of the first housing 11 away from the second housing 12, and the feed inlet 111 connects to the first cavity 110. The granular consumable enters the first cavity 110 with the feeding airflow, and falls into the second cavity 120 under its own gravity, and is then sent from the second cavity 120 to the extrusion assembly 40. Compared to having the feed inlet 111 located on the top surface of the first housing 11, this avoids the feeding airflow carrying the granular consumable into the first cavity 110 at a high velocity, which would cause the granular consumable to be quickly sent to the extrusion assembly 40, affecting the filtration effect of the granular consumable sent to the extrusion assembly 40.

[0044] Furthermore, the storage box 10 is configured to be connected to one side of the extrusion assembly 40, and the discharge port 121 is located on the side of the storage box 10 near the extrusion assembly 40.

[0045] Along the second direction X, the second housing 12 is detachably connected to one side of the extrusion assembly 40. The second housing 12 can be connected to the extrusion assembly 40 by fasteners such as screws, so as to facilitate the separation of the second housing 12 from the extrusion assembly 40. Along the second direction X, the discharge port 121 is located on the side of the second housing 12 near the extrusion assembly 40, and the discharge port 121 communicates with the second cavity 120.

[0046] In this embodiment, along the first direction Z, the bottom wall of the storage cavity 101 at the end away from the feed inlet 111 is set as a guide surface P, and the guide surface P is configured to guide the granular consumables piled on it to move toward the discharge outlet 121.

[0047] The guide surface P is specifically set as the bottom wall of the end of the second cavity 120 away from the first cavity 110. The guide surface P is an inclined surface, and the direction of the normal of the guide surface P is set at an angle with the first direction Z. Along the first direction Z, the guide surface P extends downward from the end near the first box 11 and inclined toward the side of the extrusion assembly 40.

[0048] In this embodiment, the filter structure 100 also includes a movable plate 50, and the material guide surface P has a discharge port 122. The discharge port 122 is connected to the storage chamber 101. The movable plate 50 is movably connected to the storage box 10 and is used to open or close the discharge port 122.

[0049] Along the first direction Z, the end face of the second box 12 away from the first box 11 is an inclined surface, and this inclined surface is parallel to the guide surface P. The end of the second box 12 away from the first box 11 has a protruding feeding part 123, which extends downward from the inclined surface and inclinedly toward the side away from the discharge port 121. Along the extension direction of the feeding part 123, the feeding port 122 extends from the guide surface P to penetrate the feeding part 123, so that the granular consumables in the second cavity 120 can quickly leave the second cavity 120 from the feeding port 122, thereby completing the recycling of the granular consumables in the storage cavity 101.

[0050] The size of the discharge port 122 is smaller than that of the guide surface P, and the discharge port 122 is approximately located in the middle area of ​​the guide surface P. The portion of the guide surface P without the discharge port 122 and the movable plate 50 can receive and support the granular consumables falling from the first cavity 110 into the second cavity 120, allowing the granular consumables to accumulate on the guide surface P and in the discharge port 121 and be temporarily stored in the storage cavity 101. This prevents the granular consumables from falling directly into the extrusion assembly 40 after entering the storage cavity 101, thus affecting the filtration effect of the granular consumables. Furthermore, the granular consumables accumulated in the discharge port 121 will overflow onto the guide surface P, which will then guide the overflowing granular consumables to the discharge port 121. The guide surface P will also guide the granular consumables accumulated on it to slide along the guide surface P under its own gravity to the discharge port 121, thereby allowing the granular consumables to enter the extrusion assembly 40 from the discharge port 121.

[0051] Along the third direction Y, guide protrusions 1230 are provided on opposite sides of the unloading section 123, and the extension direction of the guide protrusions 1230 is parallel to the inclination direction of the guide surface P. Along the third direction Y, sliding protrusions 51 are provided at opposite ends of the movable plate 50. The sliding protrusions 51 are approximately "L" shaped, so that the sliding protrusions 51 and the movable plate 50 together form a sliding groove 52. The guide protrusions 1230 are slidably disposed in the sliding groove 52, thereby guiding the movable plate 50 to slide, so that the unloading port 122 can be opened or closed by the sliding of the movable plate 50 relative to the unloading section 123.

[0052] Please combine Figures 2 to 5 In one embodiment, at least one side of the first housing 11 is provided with an exhaust port 112 along the third direction Y.

[0053] In this embodiment, exhaust holes 112 are provided on both sides of the first housing 11 along the third direction Y to improve the discharge efficiency of the feeding airflow, thereby improving the filtration efficiency and effect of the granular consumables. Multiple exhaust holes 112 are provided on each side of the first housing 11, arranged in a rectangular array, and all exhaust holes 112 are connected to the first cavity 110. Furthermore, along the first direction Z, the multiple exhaust holes 112 are located below the feed inlet 111.

[0054] Specifically, the diameter of the vent hole 112 is smaller than the particle size of the granular consumable, so as to prevent the granular consumable from leaving the first cavity 110 through the vent hole 112.

[0055] Furthermore, the filter assembly 20 is detachably connected to the storage box 10. At least one side of the storage box 10 is provided with a mounting part 13, the mounting part 13 is provided with a mounting cavity 131, the mounting cavity 131 communicates with the exhaust port 112, and the filter assembly 20 is at least partially located in the mounting cavity 131.

[0056] In this embodiment, along the third direction Y, mounting portions 13 are provided on both opposite sides of the first box body 11, and the mounting portions 13 are integrally formed with the first box body 11. The mounting portions 13 are generally rectangular shell structures, and the side of the mounting portions 13 near the first box body 11 is open, so that the side wall of the first box body 11 near the mounting portion 13 and the mounting portions 13 together form a mounting cavity 131.

[0057] Along the first direction Z, the top of the mounting part 13 has an inlet and outlet 132, which connects to the mounting cavity 131. The filter assembly 20 can enter or leave the mounting cavity 131 through the inlet and outlet 132. A portion of the filter assembly 20 is clamped between the storage box 10 and the mounting part 13 to ensure that the feed airflow leaving the first cavity 110 is filtered. Another portion of the filter assembly 20 is exposed in the mounting cavity 131, so that the filter assembly 20 can be quickly removed and replaced or cleaned by pulling out the portion of the filter assembly 20 exposed in the mounting cavity 131.

[0058] In this embodiment, along the third direction Y, an air vent 130 is provided on the side of the mounting part 13 away from the storage box 10, and the air vent 130 communicates with the mounting cavity 131. Multiple air vents 130 are provided, arranged in a rectangular array, and each air vent 130 corresponds to a multiple exhaust port 112, so that the feeding airflow is filtered by the filter assembly 20 before being discharged from the mounting cavity 131 through the air vent 130.

[0059] Furthermore, the filter structure 100 also includes a transparent element 60. Along the second direction X, an observation port 113 is provided on the side of the first housing 11 away from the extrusion assembly 40, and the observation port 113 connects to the first cavity 110. The transparent element 60 is made of glass or similar material, is connected to the first housing 11, and closes the observation port 113 to facilitate observation of the consumable storage status within the first cavity 110.

[0060] Furthermore, the filter assembly 20 includes a mounting member 21 and a filter element 22, the mounting member 21 being at least partially located within the mounting cavity 131, the filter element 22 being connected to the portion of the mounting member 21 located within the mounting cavity 131, and the filter element 22 being configured to filter the feed airflow flowing from the exhaust port 112 to the exhaust port 130.

[0061] The mounting component 21 is generally square in shape, and its shape is adapted to the mounting cavity 131 to ensure that the mounting component 21 can be partially placed inside the mounting cavity 131. All four sides of the mounting component 21 abut against the cavity wall of the mounting cavity 131 to ensure the sealing of the contact surfaces between the mounting component 21 and the first housing 11 and the mounting part 13.

[0062] Along the third direction Y, the mounting member 21 has a mounting groove 210 on the side near the first housing 11. The filter member 22 is a filter screen or filter cloth, etc., with the function of filtering dust and other impurities carried by the feeding airflow. Its specific structure is not limited in this application. Along the third direction Y, the side of the filter member 22 near the first housing 11 abuts against the first housing 11, so as to cover the multiple exhaust holes 112 through the filter member 22, so that the feeding airflow leaving the exhaust holes 112 flows directly through the filter member 22.

[0063] Furthermore, along the third direction Y, the side of the filter element 22 away from the first housing 11 can abut against the mounting element 21 or directly against the inner wall of the mounting part 13.

[0064] like Figure 1 As shown, this embodiment also provides an extrusion kit 200, including an extrusion assembly 40 and the above-mentioned filter structure 100, wherein the filter structure 100 is connected to the extrusion assembly 40.

[0065] The extrusion assembly 40 can be a single-nozzle extrusion mechanism or a multi-nozzle extrusion mechanism. The specific structure of the extrusion assembly 40 is not limited in this application. It can receive the granular consumables in the storage chamber 101, process the granular consumables and extrude them to the nozzle.

[0066] like Figure 5 and Figure 6 As shown, this embodiment also provides a stereolithography device 300, including the above-described filter structure 100 or the above-described extrusion kit 200.

[0067] The stereoscopic printing apparatus 300 also includes a frame 70 to which the extrusion kit 200 is connected. It is understood that the stereoscopic printing apparatus 300 also includes other necessary structures for realizing stereoscopic printing, which are not specifically described in this application.

[0068] The specific embodiments of this application have been described above with reference to the accompanying drawings. However, those skilled in the art will understand that various changes and substitutions can be made to the specific embodiments of this application without departing from the scope of this application. All such changes and substitutions fall within the scope defined by this application.

Claims

1. A filter structure for filtering particulate consumables fed from a feeding assembly to an extrusion assembly, characterized in that, The filtering structure includes: A storage box has a storage cavity inside. One end of the storage cavity is connected to the feeding assembly for receiving the feeding airflow carrying the granular consumables. The other end of the storage cavity is connected to the extrusion assembly for feeding the received granular consumables to the extrusion assembly. At least one side of the storage box has an exhaust hole, which is connected to the storage cavity. A filter assembly is disposed on the side of the storage box where the vent is provided, and the filter assembly is configured to filter the feed airflow discharged from the vent.

2. The filter structure as described in claim 1, characterized in that, The diameter of the vent hole is smaller than the particle size of the particulate consumable.

3. The filter structure as described in claim 1, characterized in that, The filter assembly is detachably connected to the storage box.

4. The filter structure as described in claim 3, characterized in that, The storage box has a mounting portion on at least one side, the mounting portion has a mounting cavity, the mounting cavity is connected to the exhaust port, and the filter assembly is at least partially located in the mounting cavity.

5. The filter structure as described in claim 4, characterized in that, The mounting part is connected to the storage box on the side near the storage box, and the mounting part and the storage box together form the mounting cavity. An air vent is provided on the side of the mounting part away from the storage box, and the air vent communicates with the mounting cavity.

6. The filter structure as described in claim 5, characterized in that, The filter assembly is clamped between the storage box and the mounting part.

7. The filter structure as described in claim 5, characterized in that, The filter assembly includes a mounting member and a filter element, the mounting member being at least partially located within the mounting cavity, the filter element being connected to the portion of the mounting member located within the mounting cavity, and the filter element being configured to filter the feed airflow flowing from the exhaust port to the air outlet.

8. The filter structure as described in claim 4, characterized in that, One end of the mounting part is provided with an inlet and outlet, which are connected to the mounting cavity. The filter component can enter or leave the mounting cavity through the inlet and outlet.

9. The filter structure as described in claim 1, characterized in that, Along the first direction, one end of the storage box has a feed inlet, and the other end of the storage box has a discharge outlet. The axis of the discharge outlet is set at an angle to the first direction.

10. The filter structure as described in claim 9, characterized in that, The storage box is configured to be connected to one side of the extrusion assembly, and the discharge port is located on the side of the storage box near the extrusion assembly.

11. The filter structure as described in claim 9, characterized in that, Along the first direction, the bottom wall of the storage chamber at the end away from the feed inlet is provided as a guide surface, which is configured to guide the granular consumables piled on it toward the discharge port.

12. The filter structure as described in claim 11, characterized in that, The filter structure also includes a movable plate, the material guide surface has a discharge port, the discharge port is connected to the storage chamber, and the movable plate is movably connected to the storage box for opening or closing the discharge port.

13. An extrusion kit, characterized in that, It includes an extrusion assembly and a filter structure as described in any one of claims 1 to 12, the filter structure being connected to the extrusion assembly.

14. A stereoscopic printing device, characterized in that, Includes the filter structure as described in any one of claims 1 to 12 or the extrusion kit as described in claim 13.

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