3D printer

Abstract

The 3D printer comprises a main machine, a 3D printing platform and a feeding device, a printing head is arranged on the main machine, the 3D printing platform is installed below the printing head, and the feeding device is connected with the printing head through a conveying pipe; the host is provided with a mounting table, a circuit board and a first electric connector are further mounted in the host, the first electric connector is located at the bottom of the mounting table, one end of the first electric connector is electrically connected with the circuit board, and the other end of the first electric connector is provided with a plurality of contacts; an axial moving module and a printing table in the 3D printing platform are mounted on a mounting seat, and the mounting seat is mounted on a mounting table; and a second electric connector is further arranged in the mounting base, one end of the second electric connector is electrically connected with the axial moving module, a plurality of contact pins are arranged at the other end of the second electric connector, and the contact pins are electrically connected with the contacts when the 3D printing platform is mounted on the host. In the disassembly and assembly process of the 3D printing platform and the host, circuit conduction can be automatically completed through mechanical butt joint, and the disassembly and assembly efficiency and maintenance convenience are improved.

Description

Technical Field

[0001] This invention relates to the field of 3D printing equipment technology, specifically to a 3D printer. Background Technology

[0002] 3D printing technology has been widely applied in many fields, among which fused deposition modeling (FDM) has become the mainstream in the market due to its low cost and ease of operation. As the technology becomes more widespread, users are increasingly demanding more portable equipment, easier maintenance, greater functional expandability, and better cost control.

[0003] Traditional 3D printers are mostly integrated, fixed structures, with core components secured by numerous bolts or even welding. This makes disassembly and maintenance cumbersome. Furthermore, traditional 3D printers are bulky, inconvenient to transport and store, and troubleshooting is time-consuming; a single module failure often requires complete machine repair, resulting in long downtime and high operating costs. Existing modularization attempts for traditional 3D printers only achieve simple mechanical disassembly; electrical connections still rely on traditional flexible cables. Long-term movement and disassembly can easily lead to cable breakage and poor contact. Exposed cables are also prone to dust and oil contamination, reducing the reliability of 3D printer operation. Moreover, cable connections have low fault tolerance and fail to address the core pain points of detachable 3D printers. Summary of the Invention

[0004] The purpose of this invention is to provide a 3D printer that automatically completes circuit connection through mechanical docking during the assembly and disassembly process of the 3D printing platform and the main unit, thereby improving assembly and disassembly efficiency and maintenance convenience. To achieve the above objective, this invention adopts the following technical solution:

[0005] This invention discloses a 3D printer, comprising: a main unit, a 3D printing platform, and a feeding device. The main unit is provided with a print head, the 3D printing platform is detachably installed below the print head, and the feeding device is connected to the print head through a feeding pipe.

[0006] The host is provided with a mounting platform, and a first groove is provided on the mounting platform. The host is also equipped with a circuit board and a first electrical connector. The print head and the feeding device are both electrically connected to the circuit board. The first electrical connector is located at the bottom of the mounting platform, and one end of the first electrical connector is electrically connected to the circuit board. The other end is provided with multiple contacts, which are exposed at the bottom of the first groove.

[0007] The 3D printing platform includes a mounting base, an axial movement module, and a printing stage. The axial movement module is mounted on the mounting base, and the printing stage is mounted on the axial movement module. The bottom of the mounting base is provided with a second groove. The mounting base is also provided with a second electrical connector. One end of the second electrical connector is electrically connected to the axial movement module, and the other end is provided with a plurality of pins corresponding to the contacts. The second electrical connector is located at the top of the second groove, and the pins extend from the top of the second groove.

[0008] When the 3D printing platform is installed on the host, the second groove is engaged with the first groove, and the pin is electrically connected to the contact.

[0009] Furthermore, the main unit includes a frame and a housing. The frame is a ring-shaped structure with a hollow center and an open perimeter. The housing is installed outside the frame, covering the perimeter of the frame, and the overall shape is U-shaped. The mounting platform is located at the bottom end of the hollow center portion of the frame.

[0010] The circuit board and the first electrical connector are mounted on the outer periphery of the rack, with the circuit board located above the rack and the first electrical connector located below the rack.

[0011] Preferably, the housing is further provided with a display screen, which is electrically connected to the circuit board, and the display screen is a touch screen.

[0012] Furthermore, the axial movement module in the 3D printing platform is an X-axis movement module, and the host is equipped with a Z-axis movement module and a Y-axis movement module. The Z-axis movement module is installed in the hollow part in the middle of the frame, the Y-axis movement module is installed on the Z-axis movement module, and the print head is installed on the Y-axis movement module.

[0013] The Z-axis moving module includes a guide rod, a slide, a screw, a first synchronous pulley, and a first servo mechanism. The guide rod and the screw are positioned in the middle of the frame along the Z-axis and are arranged in two groups along the Y-axis. The slide is mounted on the guide rod and the screw, allowing the slide to move up and down along the guide rod under the control of the screw. The Y-axis moving module is mounted on the slide.

[0014] The first servo mechanism is installed between the frame and the housing, and is located below the screw. The first servo mechanism is connected to the screws on both sides through a first synchronous pulley.

[0015] Furthermore, the Z-axis movement module also includes: an adjustment plate, on which the first servo mechanism is mounted, and multiple guide wheels are provided on the adjustment plate, with the synchronous belt of the first synchronous pulley resting on the guide wheels. A first bolt is provided on one side of the adjustment plate, one end of which is fixedly connected to the adjustment plate, and the other end extends out of the frame and is provided with a first nut. The first bolt is provided with external threads, and the frame is provided with a first mounting hole for the first bolt to extend out, the first mounting hole being provided with internal threads.

[0016] By rotating the first bolt, the position of the adjusting plate is adjusted, and the positions of the first servo mechanism and the guide wheel are adjusted as the adjusting plate moves, thereby tensioning the synchronous belt of the first synchronous pulley.

[0017] Furthermore, the print head is provided with an L-shaped first connecting plate, which allows the print head to be mounted on the Y-axis moving module. A U-shaped snap-fit ​​plate is also provided below the first connecting plate to fix the print head.

[0018] Preferably, the first groove has a corresponding limiting groove at the exposed position of the contact. During connection, the pin is inserted along the limiting groove and electrically connected to the contact.

[0019] Furthermore, the feeding device includes a screw pusher, a hopper, and a material cylinder. The screw pusher is installed at one end of the hopper and is electrically connected to the main unit. The material cylinder is installed in the hopper, and one end of the material cylinder is connected to the print head of the main unit through a feeding pipe, while the other end is filled with printing material. The hopper is equipped with a transparent cover for easy observation of whether the material cylinder is installed.

[0020] After adopting the above technical solution, the present invention has the following effects: 1. The 3D printing platform and the host in this invention adopt an electrical connection structure with pins and contacts. During the disassembly and assembly process, the circuit can be automatically completed by mechanical docking between the first groove and the second groove, which greatly improves the disassembly and assembly efficiency and maintenance convenience.

[0021] 2. The host in this invention adopts a U-shaped structure, which integrates the cables and related moving module components inside the host. Furthermore, the 3D printing platform and the host are connected by an electrical connection structure using pins and contacts, eliminating exposed cables and connectors. This makes the equipment movement wiring simpler and the equipment structure more compact, which is conducive to achieving lightweighting and high integration.

[0022] 3. The 3D printing platform and the host in this invention adopt an electrical connection structure with pins and contacts. During the high-speed movement, start-up, stop and reversal of 3D printing, there will be no momentary circuit break or loose connection due to vibration, which ensures stable power and signal transmission and improves the continuity of the printing process and the forming accuracy. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0024] Figure 2 This is a schematic diagram showing the connection between the host computer and the 3D printing platform in this invention.

[0025] Figure 3 This is a partial cross-sectional view of the connection between the host computer and the 3D printing platform in this invention.

[0026] Figure 4 This is a three-dimensional structural diagram of the host computer in this invention.

[0027] Figure 5 for Figure 4 Enlarged view of point A.

[0028] Figure 6 This is an exploded view of the host computer in this invention.

[0029] Figure 7 This is a partial cross-sectional view of the host computer in this invention.

[0030] Figure 8 This is a bottom structural diagram of the host rack in this invention.

[0031] Figure 9 This is a diagram of the back structure of the host rack in this invention.

[0032] Figure 10 This is a bottom elevation view of the main unit rack in this invention.

[0033] Figure 11 This is a three-dimensional structural diagram of the 3D printing platform in this invention.

[0034] Figure 12 This is a bottom structural diagram of the 3D printing platform in this invention.

[0035] Figure 13 for Figure 12 Enlarged view of point B.

[0036] Figure 14 This is an exploded view of the 3D printing platform in this invention.

[0037] Figure 15 This is a schematic diagram of the base plate of the leveling component in this invention being mounted on the axial moving module.

[0038] Figure 16 This is a partial cross-sectional view of the 3D printing platform in this invention.

[0039] Figure 17 This is a schematic diagram showing the connection between the second servo mechanism and the mounting base in this invention.

[0040] Figure 18 This is a three-dimensional structural diagram of the feeding device in this invention.

[0041] Figure 19 This is a schematic diagram showing the connection between the material cylinder and the hopper in this invention.

[0042] Figure 20 This is an exploded view of the printhead of the present invention.

[0043] Main component symbols: 1: Main unit; 11: Frame; 111: Mounting platform; 112: First groove; 113: First mounting hole; 114: Limiting groove; 12: Housing; 13: Circuit board; 14: First electrical connector; 141: Contact; 15: Print head; 151: First connecting plate; 152: Snap-fit ​​plate; 16: Z-axis moving module; 161: Guide rod; 162: Slide; 163: Screw; 164: First synchronous pulley; 165: First servo mechanism; 166: Adjusting plate; 167: Guide wheel; 168: First bolt; 1681: First nut; 17: Y-axis moving module; 18: Display screen. 2: 3D printing platform; 21: Mounting base; 211: Second groove; 212: Strip hole; 213: Third bolt; 22: Axial movement module (X-axis movement module); 221: Guide rail; 222: Slider; 223: Second synchronous pulley; 224: Second servo mechanism; 23: Printing table; 24: Leveling assembly; 241: Support plate; 2411: Second mounting hole; 242: Base plate; 2421: Connecting end; 2422: Second connecting plate; 243: Second bolt; 2431: Second nut; 244: Spring; 25: Second electrical connector; 251: Pin. 3: Feeding device; 31: Screw propeller; 32: Hopper; 321: Hopper cover; 33: Material cylinder; 34: Conveying pipe. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0045] In the description of this invention, it should be noted that the terms "X-axis", "Y-axis" and "Z-axis" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0046] like Figure 1 , Figures 4 to 6 As shown, the present invention discloses a 3D printer, including: a host 1, a 3D printing platform 2 and a feeding device 3. The host 1 is provided with a print head 15, the 3D printing platform 2 is detachably installed below the print head 15, and the feeding device 3 is connected to the print head 15 through a feeding pipe 34.

[0047] As shown in the figure, the host 1 is provided with a mounting platform 111, and a first groove 112 is provided on the mounting platform 111. The host 1 is also equipped with a circuit board 13 and a first electrical connector 14. The print head 15 and the feeding device 3 are both electrically connected to the circuit board 13. The first electrical connector 14 is located at the bottom of the mounting platform 111, and one end of the first electrical connector 14 is electrically connected to the circuit board 13. The other end is provided with multiple contacts 141, which are exposed at the bottom of the first groove 112.

[0048] like Figures 11 to 13 As shown, the 3D printing platform 2 includes: a mounting base 21, an axial movement module 22, and a printing table 23. The axial movement module 22 is mounted on the mounting base 21, and the printing table 23 is mounted on the axial movement module 22. The bottom of the mounting base 21 is provided with a second groove 211. The mounting base 21 is also provided with a second electrical connector 25. One end of the second electrical connector 25 is electrically connected to the axial movement module 22, and the other end is provided with a plurality of pins 251 corresponding to the contacts 141. The second electrical connector 25 is located at the top of the second groove 211, and the pins 251 extend from the top of the second groove 211.

[0049] Combination Figure 2 and Figure 3 As shown, when the 3D printing platform 2 is installed on the host 1, the second groove 211 is snapped into the first groove 112, and the pin 251 is electrically connected to the contact 141.

[0050] In this embodiment, to prevent misalignment or poor connection when the pin 251 is electrically connected to the contact 141, the first groove 112 is provided with a corresponding limiting groove 114 at the exposed position of the contact 141. During connection, the pin 251 can be automatically guided and centered along the limiting groove 114 before being electrically connected to the contact 141. At the same time, the limiting groove 114 can also restrict the position of the pin 251 during assembly and movement, ensuring stable power and signal transmission and improving the continuity and forming accuracy of the printing process.

[0051] Combination Figure 6 As shown, in this embodiment, the host 1 includes a frame 11 and a housing 12. The frame 11 is a ring-shaped structure with a hollow center and an open periphery. The housing 12 is installed on the outside of the frame 11, covering the periphery of the frame 11, and the whole is in the shape of a U-shape. The mounting platform 111 is located at the bottom end of the hollow center portion of the frame 11.

[0052] The circuit board 13 and the first electrical connector 14 are mounted on the outer periphery of the frame 11, with the circuit board 13 located above the frame 11 and the first electrical connector 14 located below the frame. Additionally, a display screen 18 is mounted on the housing 12, which is electrically connected to the circuit board 13 and is a touch screen.

[0053] Secondly, in this embodiment, the axial movement module 22 in the 3D printing platform 2 is an X-axis movement module. The host 1 is equipped with a Z-axis movement module 16 and a Y-axis movement module 17. The Z-axis movement module 16 is installed in the hollow part in the middle of the frame 11, the Y-axis movement module 17 is installed on the Z-axis movement module 16, and the print head 15 is installed on the Y-axis movement module 17.

[0054] Among them, such as Figure 7 and Figure 8 As shown, the Z-axis moving module 16 includes: a guide rod 161, a slide 162, a screw 163, a first synchronous pulley 164, and a first servo mechanism 165. The guide rod 161 and the screw 163 are positioned in the middle of the frame 11 along the Z-axis direction and are divided into two groups along the Y-axis direction. The slide 162 is mounted on the guide rod 161 and the screw 163, so that the slide 162 can move up and down along the guide rod 161 under the control of the screw 163. The Y-axis moving module 17 is mounted on the slide 162.

[0055] In this embodiment, the first servo mechanism 165 is installed between the frame 11 and the housing 12, and is located below the screw 163. The first servo mechanism 165 is connected to the screws 163 on both sides through the first synchronous pulley 164.

[0056] Secondly, in combination Figure 9 and Figure 10 As shown, the Z-axis moving module 16 also includes: an adjustment plate 166, a first servo mechanism 165 mounted on the adjustment plate 166, and a plurality of guide wheels 167 provided on the adjustment plate 166, with the synchronous belt of the first synchronous pulley 164 resting on the guide wheels 167.

[0057] A first bolt 168 is provided on one side of the adjusting plate 166. One end of the first bolt 168 is fixedly connected to the adjusting plate 166, and the other end extends out of the frame 11 and is provided with a first nut 1681. The first bolt 168 is provided with external threads (not shown in the figure). The frame 11 is provided with a first mounting hole 113 for the first bolt 168 to extend out. The first mounting hole 113 is provided with internal threads (not shown in the figure).

[0058] By rotating the first bolt 168, the position of the adjusting plate 166 is adjusted, and the positions of the first servo mechanism 165 and the guide wheel 167 are adjusted as the adjusting plate 166 moves, thereby tensioning the synchronous belt of the first synchronous pulley 164.

[0059] In addition, such as Figure 20 As shown, in this embodiment, an L-shaped first connecting plate 151 is provided on the print head 15, allowing the print head 15 to be mounted on the Y-axis moving module 17 via the first connecting plate 151. A U-shaped snap-fit ​​plate 152 is also provided below the first connecting plate 151 to fix the print head 15, ensuring the continuity of the printing process and the forming accuracy. One side of the first connecting plate 151 has an opening corresponding to the snap-fit ​​plate 152 to facilitate the installation of the print head 15.

[0060] Since the axial movement module 22 in the 3D printing platform 2 is an X-axis movement module, in this embodiment, the mounting base 21 of the 3D printing platform 2 is cuboid in shape, and the length direction of the mounting base 21 is the same as the direction of the axial movement module 22, that is, it extends along the X-axis direction. The second groove 211 is provided at the bottom of one end of the mounting base 21 along the length direction.

[0061] Among them, such as Figure 14 As shown, the axial movement module 22 includes: a guide rail 221, a slider 222, a second synchronous pulley 223, and a second servo mechanism 224. The guide rail 221 is fixed on the mounting base 21, the slider 222 is movably mounted on the guide rail 221, the second servo mechanism 224 is mounted on one end of the guide rail 221, one end of the second synchronous pulley 223 is connected to the second servo mechanism 224, and the other end is mounted on the other end of the guide rail 221.

[0062] In this embodiment, the 3D printing platform further includes a leveling component 24, which includes a support plate 241, a base plate 242, a second bolt 243, and a spring 244. The support plate 241 is disposed above the base plate 242, the printing table 23 is fixed above the support plate 241, and the base plate 242 is mounted on the axial movement module 22.

[0063] The base plate 242 has multiple outwardly protruding connecting ends 2421 arranged symmetrically around its circumference. Each connecting end 2421 is connected to the support plate 241 by a second bolt 243. Usually, there are three or four connecting ends 2421. In this embodiment, the base plate 242 has four connecting ends 2421, forming an overall cross-shaped structure.

[0064] The second bolt 243 has an external thread (not shown in the figure), and the bearing plate 241 has a second mounting hole 2411 corresponding to the second bolt 243. The second mounting hole 2411 has an internal thread (not shown in the figure), and a spring 244 is fitted on the outside of the second bolt 243. The spring 244 is located between the base plate 242 and the bearing plate 241.

[0065] To facilitate leveling the position of the printing table 23, a hexagonal second cap 2431 is provided at the bottom of the second bolt 243. In other embodiments, the second cap 2431 may also be circular or other polygonal.

[0066] When the second bolt 243 is rotated clockwise, it moves upward under the action of the internal thread in the second mounting hole 2411, and its head lifts the printing platform 23, raising the height of that point. When the second bolt 243 is rotated counterclockwise, it moves downward, and the printing platform 23 falls under its own weight or the action of the spring 244, lowering the height of that point.

[0067] By independently adjusting the second bolt 243 of each connection end 2421, the tilt angle and overall height of the printing table 23 can be precisely adjusted to achieve the required levelness or flatness.

[0068] In addition, combined Figure 15 As shown, in this embodiment, the base plate 242 is mounted on the slider 222 of the axial movement module 22, and the base plate 242 is connected to a point of the timing belt of the second timing pulley 223 through an L-shaped second connecting plate 2422, so that the printing table 23 and the leveling assembly 24 can move axially with the timing belt of the second timing pulley 223.

[0069] Combination Figure 16 and Figure 17As shown, in this embodiment, the second servo mechanism 224 is located within the mounting base 21, and the mounting base 21 is provided with multiple slotted holes 212. The second servo mechanism 224 is fixed by a third bolt 213. The length direction of the slotted holes 212 is the same as the direction of the second synchronous pulley 223. The synchronous belt of the second synchronous pulley 223 is tensioned by adjusting the installation position of the second servo mechanism 224. During installation, the second servo mechanism 224 is first fixed in the mounting base 21 by the third bolt 213. At this time, the second servo mechanism 224 is located close to the guide rail 221, and then the second synchronous pulley 223 is installed. After the second synchronous pulley 223 is installed, the second servo mechanism 224 is moved along the slotted holes 212 and adjusted away from the guide rail 221 to tension the synchronous belt of the second synchronous pulley 223.

[0070] like Figure 18 and Figure 19 As shown, in this embodiment, the feeding device 3 includes a screw pusher 31, a hopper 32, and a material cylinder 33. The screw pusher 31 is installed at one end of the hopper 32 and is electrically connected to the host 1 via a cable (not shown in the figure). The material cylinder 33 is installed in the hopper 32, and one end of the material cylinder 33 is connected to the print head 15 of the host 1 via a feeding pipe 34, while the other end is filled with printing material. The hopper 32 is provided with a transparent cover 321 to facilitate observation of whether the material cylinder 33 is installed.

[0071] The above description is merely a preferred embodiment of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the protection scope of the present invention.

Claims

1. A 3D printer, characterized in that, include: The system comprises a main unit, a 3D printing platform, and a feeding device. The main unit is equipped with a print head, the 3D printing platform is detachably mounted below the print head, and the feeding device is connected to the print head via a feeding pipe. The host is provided with a mounting platform, the mounting platform is provided with a first groove, and the host is also provided with a circuit board and a first electrical connector. The print head and the feeding device are both electrically connected to the circuit board, and the first electrical connector is located at the bottom of the mounting platform. One end of the first electrical connector is electrically connected to the circuit board, and the other end is provided with multiple contacts, which are exposed at the bottom of the first groove. The 3D printing platform includes: a mounting base, an axial movement module, and a printing stage. The axial movement module is mounted on the mounting base, and the printing stage is mounted on the axial movement module. The bottom of the mounting base is provided with a second groove. The mounting base is also provided with a second electrical connector. One end of the second electrical connector is electrically connected to the axial movement module, and the other end is provided with a plurality of pins corresponding to the contacts. The second electrical connector is located at the top of the second groove, and the pins extend from the top of the second groove. When the 3D printing platform is installed on the host, the second groove is engaged with the first groove, and the pin is electrically connected to the contact.

2. A 3D printer as described in claim 1, characterized in that: The host includes a frame and a shell. The frame is a ring-shaped structure with a hollow center and an open perimeter. The shell is installed on the outside of the frame and covers the perimeter of the frame, forming an overall U-shape. The mounting platform is located at the bottom of the hollowed-out section in the middle of the frame.

3. A 3D printer as described in claim 2, characterized in that: The circuit board and the first electrical connector are mounted on the outer portion of the rack, with the circuit board located above the rack and the first electrical connector located below the rack.

4. A 3D printer as described in claim 3, characterized in that: The housing is also provided with a display screen, which is electrically connected to the circuit board, and the display screen is a touch screen.

5. A 3D printer as described in claim 2, characterized in that: The axial movement module in the 3D printing platform is an X-axis movement module. The host is equipped with a Z-axis movement module and a Y-axis movement module. The Z-axis movement module is installed in the hollow part in the middle of the frame. The Y-axis movement module is installed on the Z-axis movement module. The print head is installed on the Y-axis movement module.

6. A 3D printer as described in claim 5, characterized in that: The Z-axis moving module includes: a guide rod, a slide, a screw, a first synchronous pulley, and a first servo mechanism. The guide rod and the screw are positioned in the middle of the frame along the Z-axis direction and are divided into two groups along the Y-axis direction. The slide is mounted on the guide rod and the screw, so that the slide can move up and down along the guide rod under the control of the screw. The Y-axis moving module is mounted on the slide. The first servo mechanism is installed between the frame and the housing, and is located below the screw. The first servo mechanism is connected to the screws on both sides through a first synchronous pulley.

7. A 3D printer as described in claim 6, characterized in that: The Z-axis moving module further includes: an adjustment plate, the first servo mechanism is mounted on the adjustment plate, and the adjustment plate is also provided with multiple guide wheels, the timing belt of the first timing pulley rests on the guide wheels; A first bolt is provided on one side of the adjusting plate. One end of the first bolt is fixedly connected to the adjusting plate, and the other end extends out of the frame and is provided with a first nut. The first bolt is provided with external threads. The frame is provided with a first mounting hole for the first bolt to extend out, and the first mounting hole is provided with internal threads. By rotating the first bolt, the position of the adjusting plate is adjusted, and the positions of the first servo mechanism and the guide wheel are adjusted as the adjusting plate moves, thereby tensioning the synchronous belt of the first synchronous pulley.

8. A 3D printer as described in claim 5, characterized in that: The print head is provided with an L-shaped first connecting plate, which allows the print head to be mounted on the Y-axis moving module. A U-shaped snap-fit ​​plate is also provided below the first connecting plate to fix the print head.

9. A 3D printer as described in claim 1, characterized in that: The first groove has a corresponding limiting groove at the exposed position of the contact. During connection, the pin is inserted along the limiting groove and electrically connected to the contact.

10. A 3D printer as described in any one of claims 1-9, characterized in that: The feeding device includes: a screw propeller, a hopper, and a cylinder. The screw propeller is installed at one end of the hopper and is electrically connected to the main unit. The material cylinder is installed in the hopper, and one end of the material cylinder is connected to the print head of the host through a feeding pipe, while the other end is filled with printing material. The hopper is equipped with a transparent cover to facilitate observation of whether the material cylinder is installed.

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