Color 3D printing device supporting online synchronous recycling of waste materials and use method

Abstract

The present application relates to a kind of color 3D printing device and use method of supporting waste online synchronous recovery.The 3D printing device includes device frame, and color printing nozzle can be moved along front, back, left and right on device frame.Model printing base station can be moved along up and down direction on device frame, and waste synchronous recovery mechanism is arranged on device frame, and waste synchronous recovery mechanism includes waste printing base station, first roller, second roller and roller drive motor are arranged on waste printing base station, and conveyor belt is arranged on first roller and second roller.Model chuck for recycling filament waste is arranged on device frame behind conveyor belt, and chuck drive motor is arranged on device frame.Problem of recycling and utilizing waste produced by color FDM printing is effectively solved, and deficiency of current waste recycling and reusing equipment is made up, more suitable for waste recovery of consumer-grade color 3D printing application scene, and material utilization is improved.

Description

Technical Field

[0001] This invention relates to the field of color 3D printing technology, and specifically to a device and method for online synchronous waste recycling during the color 3D printing process based on FDM technology. Background Technology

[0002] Currently, color 3D printing is the trend in 3D printing technology development. Compared to other color 3D printing processes, such as binder jetting and material jetting, color FDM printing is more conducive to the promotion and application of color 3D printing technology in the consumer market due to its lower equipment cost. As a typical example of material extrusion technology, FDM (Fused Deposition Modeling) technology utilizes thermoplastic polymer filaments (commonly known as plastics) as printing consumables, such as PLA (Polylactic Acid) and ABS (Arcylonitrile Butadiene Styrene). By controlling the filament's entry into the print head and controlling the internal heating temperature, the filament undergoes a melting transformation within the print head, achieving the plasticization of the printing material from a solid to a molten state. The molten material is then extruded through the extrusion head structure at the end of the print head. The extruded molten material is cooled by a fan at the end of the print head, completing the transformation from a molten state to a solid state. Simultaneously, this process, combined with the motion system of the FDM equipment, guides the extruded molten material along a pre-planned printing path, processing it from point to line, from line to surface, and then from surface to volume, ultimately achieving the molding and printing of a 3D digital model.

[0003] Compared to traditional monochrome FDM printing, color FDM printing not only enhances visual appeal but also expands its application potential across various industries, such as product prototyping, architectural model making, and personalized consumer product customization. Color FDM printing will demonstrate greater potential. Currently, commonly used color FDM printing solutions include multi-color filament melting and mixing technology and multi-filament switching technology. Multi-color filament melting and mixing technology involves simultaneously feeding different colored filaments into a single printhead, where they are mixed and printed according to their respective color ratios within a single extrusion head. However, this technology faces problems such as uneven color mixing. Often, when the ideal color material is extruded from the extrusion head, a large amount of transitional color material is extruded. This transitional color material cannot be used for printing on the color model and is treated as "printing waste." Multi-filament switching technology feeds different colored filaments into separate single extrusion heads. Since alternating printing of filaments also produces transitional color material in the printhead, this transitional color material is also treated as "printing waste." Therefore, both of the above solutions require waste treatment of the molten transition color or the transition color of different colored filaments in the printing extruder.

[0004] The aforementioned recycling methods for printing waste generally follow the process of first crushing and grinding the waste, then remelting the granules or powder, and finally extruding them into filaments. Alternatively, these filaments can be recycled into a collection tray for subsequent FDM printing, or they can be granulated back into pellets for reuse. However, these methods treat the entire 3D printing waste recycling process as a separate piece of equipment, suitable for large-scale recycling scenarios. They are clearly unsuitable for consumer-grade color 3D printing applications. Therefore, a waste recycling device and method more suitable for consumer-grade color 3D printing applications is needed, capable of recycling and reusing small-scale color 3D printing waste, improving material utilization, and thus better aligning with the national policy advocating green and low-carbon development in manufacturing. Summary of the Invention

[0005] The purpose of this invention is to provide a color 3D printing device that supports online synchronous recycling of waste materials, so as to solve the above-mentioned technical problems existing in the prior art; at the same time, the purpose of this invention is also to provide a method of using the above-mentioned color 3D printing device.

[0006] To achieve the above objectives, the present invention provides a color 3D printing device supporting online synchronous waste recycling, which adopts the following technical solution: A color recycling 3D printing device supporting online synchronous waste recycling includes a device frame, on which a color printing nozzle capable of moving forward, backward, left, and right is mounted; on which a model printing base capable of moving up and down is mounted; and on which a waste synchronous recycling mechanism is mounted, comprising a waste printing base, a first roller, a second roller, and a roller drive motor are mounted on the waste printing base; a conveyor belt is mounted on the first roller and the second roller, the conveyor belt being used to supply the color printing nozzle with filamentous waste and to convey the filamentous waste backward; and a filament chuck for recycling filamentous waste is mounted on the device frame behind the conveyor belt, and a chuck drive motor for driving the filament chuck to rotate is mounted on the device frame.

[0007] The device frame is provided with a first guide post extending in the vertical direction. The model printing base is guided and moved vertically on the first guide post. The device frame is provided with a first lead screw extending in the vertical direction. The model printing base is threadedly connected to the first lead screw. The device frame is provided with a first lead screw drive mechanism that drives the first lead screw to rotate.

[0008] The waste printing base is movably mounted on the device frame.

[0009] The device frame is provided with a second guide post extending in the vertical direction. The waste printing base is guided and moved vertically on the second guide post. The device frame is provided with a second lead screw extending in the vertical direction. The waste printing base is threadedly connected to the second lead screw. The device frame is provided with a second lead screw drive mechanism that drives the second lead screw to rotate.

[0010] A method for using the above-mentioned 3D printing device according to the present invention adopts the following technical solution: including the following steps,

[0011] 1) Based on the given color model M, establish the corresponding voxel model V;

[0012] 2) Based on the color information of the given color model M, perform color assignment processing on each voxel unit in the above voxel model V to obtain the color voxel model N after color assignment;

[0013] 3) Based on the color voxel model N after color assignment, calculate the planning and processing of color slices and color printing paths;

[0014] 4) Move the model printing base and waste printing base to the printing position. Before each printing starts, it is necessary to determine whether the color value of the current printing path is consistent with the color value of the previous printed color path. If they are consistent, move the color printing nozzle to the model printing base to print the model. If they are inconsistent, move the color printing nozzle to the waste printing base to print and recycle waste filaments until the waste printing is completed. Then move the color printing nozzle to the model printing base to continue printing the model.

[0015] In step 1), the resolution of the voxel model is set according to the diameter of the nozzle at the bottom of the extrusion head of the color printhead.

[0016] In step 2), the color assignment process is performed according to the following steps:

[0017] I) Traverse each voxel unit of the voxel model V and calculate the color information of each voxel unit; the color information of each voxel unit is calculated through the following steps:

[0018] a) Assume the current center point of the voxel unit is P, and use the center point of the voxel unit as the three-dimensional spatial position of the voxel unit.

[0019] b) Using point P as a sampling point, map it to the color model M, and calculate the color value C of the sampling point;

[0020] c) Then assign the color value C of the current sampling point to the corresponding voxel unit on the voxel model V.

[0021] Ⅱ) After the above traversal process, the color value of each voxel unit in the voxel model V has been calculated, resulting in a color voxel model N.

[0022] In step 3), the calculation of the color slices and the planning of the color paths are achieved through the following steps:

[0023] Ⅰ) Based on the color voxel model N, calculate the two-dimensional color voxel cutting plane at the corresponding slice height position according to the set slice height;

[0024] Ⅱ) Traverse the above two-dimensional color voxel tangent planes to generate the color path of the current layer; the steps for generating the color path of the current layer are as follows:

[0025] a) Assuming the tangent plane of the two-dimensional color voxels in the current layer is S, according to the color attribute information, the color voxel units with the same color attribute are merged together to form color unit sub-regions.

[0026] b) Then, path generation is performed in each sub-region. A straight-line filling algorithm is used as the filling path to generate corresponding colored paths in each sub-region. The color of the planned path within each sub-region is the same as the color attribute value of the current sub-region.

[0027] c) Once all slice layers have been processed, the color paths in each layer together form the color printing path of the color model that needs to be printed.

[0028] Step 4) specifically includes the following steps:

[0029] A) Equipment preparation: Move the model printing base and the waste printing base to the printing position, ensuring that the gap thickness between the end of the color print head's extrusion head and the model printing base, as well as the gap thickness between the extrusion head and the waste printing base, are both 0.05mm-0.15mm.

[0030] B) Iterate through the set of color printing paths generated in step 3) and perform the following processing:

[0031] a) Extract the current layer height position of the color path and control the model printing platform to move to the corresponding height;

[0032] b) Determine if the color value of the current color printing path is consistent with the color value of the previous color printing path; if they are inconsistent, perform the "online recycling process for waste filaments"; if they are consistent, stack the material on the color printing nozzle on the model printing platform according to the printing route in the current color printing path.

[0033] c) Repeat step B) above until all color print paths for the color models have been printed.

[0034] Step b) of the "online recycling and processing procedure for waste filaments" includes the following steps:

[0035] i) Move the color printhead above the waste printing base;

[0036] ii) Switch to a specific color of filament in the color print head. Due to the color change, the waste material of the transition color is squeezed out from the color print head. Control the color print head to perform spiral horizontal printing with the inclined section of the "waste recycling filament printing model". The diameter of the "waste recycling filament printing model" is consistent with the diameter of the consumable used. The printed waste recycling filament gradually grows along the conveyor belt on the waste printing base.

[0037] iii) Once the waste printing filament on the waste printing base reaches the specified length, the conveyor belt is started, and the chuck drive motor is used to control the chuck to rotate and recycle the waste filament.

[0038] iv) When the waste material in the color print head has finished printing, record the position of the color print head on the waste material printing platform, and wait for the waste material generated during the next material change to continue printing from the last printing position;

[0039] v) Move the color printhead to the model printing platform and continue printing the color model.

[0040] The beneficial effects of this invention are as follows: The 3D printing device of this invention can not only realize the 3D printing of color models, but also ensure that the large amount of waste generated during color 3D printing due to the replacement of color filaments or the need to melt and mix materials to produce a specified color is simultaneously recycled in the form of filaments. The recycled waste is wound into a filament chuck. This effectively solves the problem of waste recycling generated by color FDM printing, making up for the shortcomings of current waste recycling equipment that can only be processed based on the "crushing-melting-filament making-granulation" process. It is more suitable for waste recycling in consumer-grade color 3D printing applications, improves material utilization, and thus better conforms to the national industrial policy advocating green and low-carbon development of manufacturing. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of a structure of an embodiment of a color 3D printing device that supports online synchronous recycling of waste materials according to the present invention;

[0042] Figure 2 yes Figure 1 A structural diagram from another angle;

[0043] Figure 3 yes Figure 2 A structural diagram from another angle;

[0044] Figure 4 This is a schematic diagram of the waste recycling structure;

[0045] Figure 5 This is a schematic diagram of the cross-section of a color voxel;

[0046] Figure 6 This is a schematic diagram of the sub-region division results after merging color voxel slices;

[0047] Figure 7 This is a schematic diagram of the color path generation result for a color voxel slice. Detailed Implementation

[0048] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0049] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The use of "belonging" in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0050] An embodiment of the color 3D printing device supporting online synchronous waste recycling according to the present invention, such as... Figures 1-4 As shown, the device includes a frame 1, on which a color printing nozzle 3 capable of moving forward, backward, left, and right is mounted. Specifically, the color printing nozzle is mounted on the frame via a Core motion mechanism. This Core motion mechanism is existing technology, and its specific structure and working principle will not be detailed in this embodiment. This type of motion mechanism is widely used in 3D printers and includes two motors 2, enabling translation in both the X and Y directions within the same horizontal plane. The color printing nozzle 3 uses an existing FDM nozzle, and its specific structure will not be detailed in this embodiment either. In short, the color printing nozzle 3 includes a multi-color filament connector 16 and an extrusion head 17 arranged sequentially. The lower part of the extrusion head has a nozzle. The extrusion head 17 includes a filament feeding module 20 for conveying the filament 22 and a heating module 21 for melting the filament.

[0051] In this embodiment, a model printing base 5 capable of moving vertically is provided on the device frame 1. A waste material synchronous recycling mechanism, including a waste material printing base 10, is also provided on the device frame. The waste material printing base 10 is equipped with a first roller 11, a second roller 12, and a roller drive motor 19. A conveyor belt 13 is provided on the first and second rollers. The conveyor belt is used to supply the color printing nozzles with filamentous waste material and to convey the filamentous waste material backward. The roller drive motor drives one of the rollers to rotate via a sprocket, pulley, or gear to enable the conveyor belt to operate. A filament chuck 14 for recycling the filamentous waste material 15 is provided behind the conveyor belt on the device frame. A chuck drive motor 18 is provided on the device frame to drive the filament chuck to rotate. In this embodiment, the waste filament material is printed in a spiral horizontal printing manner, with a cross-section shown as 23.

[0052] The device frame 1 has two first guide posts 4 extending vertically. A model printing base 5 is vertically guided and mounted on the first guide posts 4. A first lead screw 6 is provided on the device frame, and the model printing base 5 is threadedly connected to the first lead screw 6. A first lead screw drive mechanism 7 is provided on the device frame to drive the first lead screw 7 to rotate. Similarly, a waste material printing base 10 is vertically movable on the device frame 1. The device frame 1 has two second guide posts 8 extending vertically. The waste material printing base 10 is vertically guided and mounted on the second guide posts 8. A second lead screw 9 is provided on the device frame 1, and the waste material printing base 10 is threadedly connected to the second lead screw 9. A second lead screw drive mechanism is provided on the device frame 1 to drive the second lead screw 9 to rotate. Both the first and second lead screw drive mechanisms are driven by motors.

[0053] The above-mentioned 3D printing device is used as follows, including the following steps:

[0054] 1) Based on the given color model M, establish the corresponding voxel model V.

[0055] In step 1), the resolution of the voxel model V is established according to the diameter of the nozzle at the bottom of the extrusion head of the color printhead. This is because the minimum resolution of a color FDM printhead is the size of a nozzle.

[0056] 2) Based on the color information of the given color model M, perform color assignment processing on each voxel unit in the above voxel model V to obtain the color voxel model N after color assignment.

[0057] In step 2), the color assignment process is performed according to the following steps:

[0058] I) Traverse each voxel unit of the voxel model V and calculate the color information of each voxel unit. The color information of each voxel unit is calculated through the following steps:

[0059] a) Assume the current center point of the voxel unit is P, and use the center point of the voxel unit as the three-dimensional spatial position of the voxel unit.

[0060] b) Using point P as a sampling point, map it to the color model M, and calculate the color value C of the sampling point;

[0061] c) Then assign the color value C of the current sampling point to the corresponding voxel unit on the voxel model V.

[0062] Clearly, the color voxel model V is an approximate representation of the color model M in three-dimensional voxel space. For voxel units not included in the color model M, the corresponding color information is not contained.

[0063] Ⅱ) After the above traversal process, the color value of each voxel unit in the voxel model V has been calculated, resulting in a color voxel model N.

[0064] 3) Based on the color voxel model N after color assignment, calculate the planning and processing of color slices and color printing paths.

[0065] In step 3), the calculation of the color slices and the planning of the color paths are achieved through the following steps:

[0066] Ⅰ) Based on the color voxel model N, calculate the two-dimensional color voxel cutting plane at the corresponding slice height position according to the set slice height;

[0067] Ⅱ) Traverse the above two-dimensional color voxel tangent planes to generate the color path of the current layer; the steps for generating the color path of the current layer are as follows:

[0068] a) Assume the tangent plane of the two-dimensional color voxel in the current layer is S, such as Figure 5 As shown, based on color attribute information, color voxel units with the same color attribute are merged together to form color unit sub-regions, such as... Figure 6 As shown, for example, S1, S2, S3 and S4;

[0069] b) Then, path generation is performed within each sub-region, using a straight-line filling algorithm as the filling path to generate corresponding colored paths in each sub-region, such as... Figure 7 As shown, for example, Path1, Path12, Path3, and Path4. The color of the planned path within each sub-region is the same as the color attribute value of the current sub-region;

[0070] c) Once all the color slice layers have been processed, the color paths in each layer together form the color printing path of the color model that needs to be printed.

[0071] 4) Move the model printing base and waste printing base to the printing position. Before each printing starts, it is necessary to determine whether the color value of the current printing path is consistent with the color value of the previous printed color path. If they are consistent, move the color printing nozzle to the model printing base to print the model. If they are inconsistent, move the color printing nozzle to the waste printing base to print and recycle waste filaments until the waste printing is completed. Then move the color printing nozzle to the model printing base to continue printing the model.

[0072] In step 4), this is specifically achieved through the following steps:

[0073] A) Equipment Preparation: Move the model printing base and waste printing base to the printing position, ensuring that the gap thickness between the end of the color printhead's extrusion head and the model printing base, as well as the gap thickness between the extrusion head and the waste printing base, are both 0.05mm-0.15mm. In this embodiment, 0.01mm is selected, which is the thickness of an A4 sheet of paper. In other embodiments, 0.05mm or 0.15mm can also be selected.

[0074] B) Iterate through the set of color printing paths generated in step 3) and perform the following processing:

[0075] a) Extract the current layer height position of the color path and control the model printing platform to move to the corresponding height;

[0076] b) Determine if the color value of the current color printing path is consistent with the color value of the previous color printing path; if they are inconsistent, perform the "online recycling process for waste filaments"; if they are consistent, stack the material on the color print head on the model printing platform according to the printing route in the current color printing path.

[0077] c) Repeat step B) above until all color paths of the color models have been printed.

[0078] In step b), the "online recycling and processing procedure for waste filaments" includes the following steps:

[0079] i) Move the color printhead above the waste printing base;

[0080] ii) Switch to a specific color filament on the color printhead. Due to the color change, the transitional color waste is extruded from the color printhead. Control the color printhead to perform spiral horizontal printing with the inclined section of the "waste recycled filament printing model". The diameter of the "waste recycled filament printing model" is consistent with the diameter of the filament used. In this way, the printed waste recycled filament gradually grows along the conveyor belt on the waste printing base. In this step, the diameter of the "waste recycled filament printing model" is consistent with the diameter of the filament used. The advantage is that it can be used for subsequent regular non-color 3D printing tasks.

[0081] iii) Once the waste printing filament on the waste printing base reaches the specified length, the conveyor belt is started, and the chuck drive motor is used to control the chuck to rotate and recycle the waste filament.

[0082] iv) When the waste material in the color print head has finished printing, record the position of the color print head on the waste material printing platform, and wait for the waste material generated during the next material change to continue printing from the last printing position;

[0083] v) Move the color printhead to the model printing platform and continue printing the model.

[0084] d) The above process can be converted into GCode instructions commonly used in 3D printing and saved as a G file.

Claims

1. A color 3D printing method supporting online synchronous recycling of waste materials, characterized in that: Includes the following steps, 1) Based on the given color model M, establish the corresponding voxel model V; 2) Based on the color information of the given color model M, perform color assignment processing on each voxel unit in the above voxel model V to obtain the color voxel model N after color assignment; In step 2), the color assignment process is performed according to the following steps: I) Traverse each voxel unit of the voxel model V and calculate the color information of each voxel unit; the color information of each voxel unit is calculated through the following steps: a) Assume the current center point of the voxel unit is P, and use the center point of the voxel unit as the three-dimensional spatial position of the voxel unit. b) Using point P as a sampling point, map it to the color model M, and calculate the color value C of the sampling point; c) Then assign the color value C of the current sampling point to the corresponding voxel unit on the voxel model V; Ⅱ) After the above traversal process, the color value of each voxel unit in the voxel model V has been calculated, resulting in a color voxel model N; 3) Based on the color voxel model N after color assignment, calculate the planning and processing of color slices and color printing paths; 4) Move the model printing base and waste printing base to the printing position. Before each printing starts, it is necessary to determine whether the color value of the current printing path is consistent with the color value of the previous printed color path. If they are consistent, move the color printing nozzle to the model printing base to print the model. If they are inconsistent, move the color printing nozzle to the waste printing base to print and recycle the waste filaments until the waste printing is completed. Then move the color printing nozzle to the model printing base to continue printing the model.

2. The color 3D printing method according to claim 1, characterized in that: In step 1), the resolution of the voxel model is set according to the diameter of the nozzle at the bottom of the extrusion head of the color printhead.

3. The color 3D printing method according to claim 1, characterized in that: In step 3), the calculation of the color slices and the planning of the color paths are achieved through the following steps: Ⅰ) Based on the color voxel model N, calculate the two-dimensional color voxel cutting plane at the corresponding slice height position according to the set slice height; Ⅱ) Traverse the above two-dimensional color voxel tangent planes to generate the color path of the current layer; the steps for generating the color path of the current layer are as follows: a) Assuming the tangent plane of the two-dimensional color voxels in the current layer is S, according to the color attribute information, the color voxel units with the same color attribute are merged together to form color unit sub-regions. b) Then, path generation is performed in each sub-region. A straight-line filling algorithm is used as the filling path to generate corresponding colored paths in each sub-region. The color of the planned path within each sub-region is the same as the color attribute value of the current sub-region. c) Once all slice layers have been processed, the color paths in each layer together form the color printing path of the color model that needs to be printed.

4. The color 3D printing method according to claim 1, characterized in that: Step 4) specifically includes the following steps: A) Equipment preparation: Move the model printing base and waste printing base to the printing position, ensuring that the gap thickness between the end of the color print head extrusion head and the model printing base, as well as the gap thickness between the extrusion head and the waste printing base, are both 0.05mm-0.15mm. B) Iterate through the set of color printing paths generated in step 3) and perform the following processing: a) Extract the current layer height position of the color path and control the model printing platform to move to the corresponding height; b) Determine if the color value of the current color printing path is consistent with the color value of the previous color printing path; if they are inconsistent, perform the "online recycling process for waste filaments"; if they are consistent, stack the material on the color printing nozzle on the model printing platform according to the printing route in the current color printing path. c) Repeat step B) above until all color print paths for the color models have been printed.

5. The color 3D printing method according to claim 4, characterized in that: In step b), the "online recycling and processing flow of waste filaments" includes the following steps: i) Move the color printhead above the waste printing base; ii) Switch to a specific color filament on the color print head. Due to the color change, the waste material of the transition color is squeezed out from the color print head. Control the color print head to perform spiral horizontal printing with the inclined section of the "waste recycling filament printing model". The diameter of the "waste recycling filament printing model" is consistent with the diameter of the filament used. The printed waste recycling filament gradually grows along the conveyor belt on the waste printing base. iii) Once the waste printing filament on the waste printing base reaches the specified length, the conveyor belt is started, and the chuck drive motor is used to control the chuck to rotate and recycle the waste filament. iv) When the waste material in the color print head has finished printing, record the position of the color print head on the waste material printing platform, and wait for the waste material generated during the next material change to continue printing from the last printing position; v) Move the color printhead to the model printing platform and continue printing the color model.

6. A color 3D printing apparatus employing the color 3D printing method according to any one of claims 1-5, comprising a frame, a color printing nozzle movable in the front, back, left, and right directions on the frame, and a model printing base movable in the up and down direction on the frame, characterized in that: The device frame is equipped with a waste material synchronous recycling mechanism, which includes a waste material printing base. The waste material printing base is equipped with a first roller, a second roller, and a roller drive motor. Conveyor belts are installed on the first roller and the second roller. The conveyor belts are used to supply the color printing nozzles with filamentous waste material and to convey the filamentous waste material backward. A filament chuck for recycling filamentous waste material is installed on the device frame behind the conveyor belt. A chuck drive motor for driving the filament chuck to rotate is installed on the device frame.

7. The color 3D printing apparatus according to claim 6, characterized in that: The device frame is provided with a first guide post extending in the vertical direction. The model printing base is guided and moved vertically on the first guide post. The device frame is provided with a first lead screw extending in the vertical direction. The model printing base is threadedly connected to the first lead screw. The device frame is provided with a first lead screw drive mechanism that drives the first lead screw to rotate.

8. The color 3D printing apparatus according to claim 6, characterized in that: The waste printing base is movably mounted on the device frame.

9. The color 3D printing apparatus according to claim 8, characterized in that: The device frame is provided with a second guide post extending in the vertical direction. The waste printing base is guided and moved vertically on the second guide post. The device frame is provided with a second lead screw extending in the vertical direction. The waste printing base is threadedly connected to the second lead screw. The device frame is provided with a second lead screw drive mechanism that drives the second lead screw to rotate.

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