A 3D printer

Abstract

The application provides a 3D printer, comprising a base, a support, a first driving assembly arranged on the base, a second driving assembly arranged on the first driving assembly, the first driving assembly driving the second driving assembly to move along the height direction of the support, the second driving assembly driving a printing head to move along the parallel direction of the crossbar of the support, a third driving assembly arranged on the base, the third driving assembly driving a hot bed assembly to move relative to the base, the hot bed assembly driving a clamp to rotate relative to the base and simultaneously driving the clamp to rotate around its own axis. The third driving assembly and the second driving assembly cooperate with the third driving assembly to realize three-axis driving of a printed article, cooperate with the double-axis driving of the hot bed assembly to realize five-axis driving of the printed article by the printer, and the continuous fiber composite material 3D printing method of the five-axis 3D printer does not need a special forming die, and the die cost is greatly reduced compared with AFP and APL technologies.

Description

Technical Field

[0001] This application relates to a printer, and more particularly to a 3D printer. Background Technology

[0002] Continuous fiber reinforced composites are widely used in aerospace, automotive manufacturing, and marine engineering due to their excellent mechanical properties, lightweight and high strength. As the composite materials industry continues to mature, manually laminated multilayer and complex laminates are gradually being replaced by more efficient and higher-quality Automated Tape Placement (ATL) and Automated Fiber Placement (AFP) technologies.

[0003] However, the filament placement head of AFP equipment is relatively large, which may cause collisions or interference when manufacturing small parts or parts with complex internal structures.

[0004] In contrast, most existing technologies use 3D printing continuous fiber technology, which can significantly reduce upfront investment and product development cycle, and help reduce production costs. Most extrusion 3D printers on the market currently use three-degree-of-freedom nozzles, which can only print on horizontal planes one by one along the originally set path. For some suspended parts, additional support structures must be added outside the part body to prevent local collapse, which has certain limitations. Utility Model Content

[0005] This application provides a 3D printer to solve the problems existing in related technologies. The technical solution is as follows: This application provides a 3D printer, including: Base; The bracket is mounted on the base. The first drive component is mounted on the base. A second drive assembly is disposed on the first drive assembly, and the first drive assembly drives the second drive assembly to move along the height direction of the bracket. A printhead assembly is mounted on a second drive assembly, which drives the printhead to move along the parallel direction of the support crossbar. The third drive component is mounted on the base. A heated bed assembly is mounted on a base, and a third drive assembly drives the heated bed assembly to move relative to the base. The fixture is mounted on the heated bed assembly. The fixture holds the material and works with the print head assembly to print. The heated bed assembly drives the fixture to rotate relative to the base, and at the same time drives the fixture to rotate on its own axis.

[0006] In one implementation, The heated bed assembly includes: The first heated bed frame is mounted on the base, and the third drive assembly drives the first heated bed frame to move along the base. The second heated bed frame is mounted on the first heated bed frame, and the clamp is mounted on the second heated bed frame; A first motor is mounted on a first heated bed frame, and the first motor drives a second heated bed frame to rotate relative to the first heated bed frame; The second motor is mounted on the second heated bed frame. The second motor drives the fixture to rotate relative to the second heated bed frame. A third chain and a third sprocket are provided between the second motor and the fixture.

[0007] In one implementation, Both the first and second heated bed frames have a U-shaped cross-section, with their two ends corresponding to each other.

[0008] In one implementation, The heated bed assembly also includes: Two connecting shafts are respectively located at the two ends of the second heated bed frame and pass through the two ends of the first heated bed frame. One of the connecting shafts is located at the output end of the first motor.

[0009] In one implementation, it further includes: The first fixing rod is mounted on the base. The first slider is mounted on the first heated bed frame, and the third drive assembly drives the first heated bed frame to move relative to the base so that the first slider slides along the first fixed rod.

[0010] In one implementation, The third drive component includes: The third motor is mounted on the base. Two first sprockets are respectively mounted on the base and at the output end of the third motor; The first chain is mounted on two first sprockets, and the first heated bed frame is mounted on the first chain.

[0011] In one implementation, The second drive component includes: Two second sliders are mounted on the first drive assembly; Two second fixing rods are arranged between two second sliders; The fourth motor is mounted on one of the sliders; Two second sprockets are respectively mounted on the output end of the fourth motor and on the slider away from the fourth motor; The second chain is fitted between the two second sprockets; A sliding seat is mounted on the second chain and slides along the second fixed rod. The printhead assembly is mounted on the sliding seat.

[0012] In one implementation, The first driving component includes: Two fifth motors, both of which are mounted on a bracket; Two lead screws are respectively mounted on the output ends of two fifth motors, and two second sliders are respectively mounted on the two lead screws. When the two lead screws rotate simultaneously, the lead screws drive the second sliders to move relative to the height of the support.

[0013] In one implementation, The printhead assembly includes: The print head is mounted on the slide block. The sixth motor is located on the print head to control the feeding and retraction of the filament. A fan is installed on the printhead to cool the printhead nozzles and the extruded material.

[0014] In one implementation, The printhead assembly also includes: Consumable sensor, located on the print head, detects whether consumables are connected to the print head.

[0015] The advantages or beneficial effects of the above technical solutions include at least the following: The three-axis drive of the printed object is achieved by the third drive component and the second drive component working together with the third drive component. With the dual-axis drive of the heated bed frame component, the printer achieves five-axis drive of the printed object. The continuous fiber composite material 3D printing method of the five-axis 3D printer does not require a special molding mold, which greatly reduces the mold cost compared with AFP and APL technologies.

[0016] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0017] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0018] Figure 1 This is the circuit wiring diagram for the printer; Figure 2 This is a screenshot of the printer's web interface. Figure 3 This is a schematic diagram of the structure of this utility model; Figure 4 This is a schematic diagram of the base structure; Figure 5 This is a schematic diagram of the printhead assembly. Figure 6 This is a schematic diagram of the exploded structure of a heated bed assembly. Figure 7 This is a schematic diagram of the support structure; In the picture: 100. Base; 110. First fixing rod; 200. Bracket; 300. First drive assembly; 310. Fifth motor; 320. Lead screw; 400, Second drive assembly; 410, Second slider; 420, Second fixed rod; 430, Fourth motor; 440, Sliding seat; 450, Second sprocket; 500. Printhead assembly; 510. Printhead; 520. Sixth motor; 530. Fan; 540. Consumable sensor; 600. Third drive assembly; 610. Third motor; 620. First sprocket; 700, Heated bed assembly; 710, First heated bed frame; 711, First slider; 720, Second heated bed frame; 730, First motor; 740, Second motor; 750, Connecting shaft; 760, Third sprocket; 800. Fixture. Detailed Implementation

[0019] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0020] Figures 1-7 A structural diagram of a 3D printer according to an embodiment of this application is shown. Figures 1-7 As shown, the printer may include: Base 100; The bracket 200 is mounted on the base 100. The first drive component 300 is disposed on the base 100; The second drive component 400 is disposed on the first drive component 300, and the first drive component 300 drives the second drive component 400 to move along the height direction of the bracket 200. Printhead assembly 500 is mounted on second drive assembly 400, which drives printhead 510 to move in the parallel direction along crossbar of support 200. The third drive component 600 is mounted on the base 100. A heated bed assembly 700 is mounted on a base 100, and a third drive assembly 600 drives the heated bed assembly 700 to move relative to the base 100. The fixture 800 is mounted on the heated bed assembly 700. The fixture 800 holds the material and cooperates with the print head assembly 500 for printing. The heated bed assembly 700 drives the fixture 800 to rotate relative to the base 100, and at the same time drives the fixture 800 to rotate on its own axis.

[0021] like Figures 3-7 As shown, in this embodiment, The item to be printed is placed on the fixture 800, which holds a fixed glue rod. The item to be printed is adhered to the solid glue rod. The fixture 800 is driven to rotate by the heated bed assembly 700, and can also rotate along the direction of the heated bed assembly 700, thereby realizing the dual-axis rotation of the printed item. The third drive assembly 600 drives the heated bed assembly 700 to move relative to the base 100, thereby changing the position of the printed item relative to the print head assembly 500. The second drive assembly 400 drives the print head 510 to move laterally along the support 200, thereby changing the position of the print head assembly 500 relative to the printed object; The first drive assembly 300 drives the print head 510 to move up and down along the height direction of the bracket 200, thereby adjusting the distance between the print head 510 and the base 100 to facilitate printing of items; The three-axis drive of the printed object is achieved by the third drive component 600 and the second drive component 400 working together. With the dual-axis drive of the heated bed frame component, the printer achieves five-axis drive of the printed object. The continuous fiber composite material 3D printing method of the 5-axis 3D printer does not require a special molding mold, which greatly reduces the mold cost compared with AFP and APL technologies. There is no need to print on a traditional heated bed horizontal surface. With the help of the 800 fixture and the metal substrate, the shape of the printed part can be perfectly adapted to the curved surface of the substrate. You only need to adjust the shape of the metal substrate and the corresponding print file as needed. The surface of the metal substrate was treated with double-sided tape and solid color-changing adhesive sticks, which made it easier for the carbon fiber filaments to adhere to the substrate during the first layer printing, resulting in a low failure rate for the first layer. After printing, we used WD-40 solvent to spray the joint between the printed part and the metal tube substrate to remove the adhesive, thus easily removing the printed continuous fiber composite material part. The operation was simple and the adhesive removal and part retrieval efficiency was high.

[0022] like Figure 3 and Figure 6 As shown, in one embodiment, The heated bed assembly 700 includes: The first heated bed frame 710 is mounted on the base 100, and the third drive assembly 600 drives the first heated bed frame 710 to move along the base 100. The second heated bed frame 720 is mounted on the first heated bed frame 710, and the clamp 800 is mounted on the second heated bed frame 720. First motor 730 (corresponding to) Figure 1 and Figure 2 The first motor 730 is mounted on the first heated bed frame 710 and drives the second heated bed frame 720 to rotate relative to the first heated bed frame 710. Second motor 740 (corresponding to) Figure 1 and Figure 2 The second motor 740 is mounted on the second heated bed frame 720. The second motor 740 drives the clamp 800 to rotate relative to the second heated bed frame 720. A third chain and a third sprocket 760 are provided between the second motor 740 and the clamp 800.

[0023] In this embodiment, the first motor 730 drives the second heated bed frame 720 to rotate relative to the first heated bed frame 710, so that the second heated bed frame 720 drives the clamp 800 to rotate; The second motor 740 drives the fixture 800 to rotate via the third chain and the third sprocket 760, so that the fixture 800 can rotate relative to the first heated bed frame 710 while rotating, thus achieving dual-axis adjustment; Specifically, the heated bed assembly 700 also includes: Two connecting shafts 750 are respectively disposed at the two ends of the second heated bed frame 720 and pass through the two ends of the first heated bed frame 710. One of the connecting shafts 750 is disposed at the output end of the first motor 730. The second heated bed frame 720 rotates around the connecting shaft 750. When the first motor 730 drives the second heated bed frame 720, the second heated bed frame 720 rotates around the connecting shaft 750. In conjunction with the rotation of the clamp 800, dual-axis adjustment of the printed items is achieved. The second motor 740 drives the third sprocket 760 to rotate. Under the action of the third chain, the third sprocket 760 at the bottom of the clamp 800 rotates, thereby realizing the rotation of the clamp 800 by the second motor 740.

[0024] like Figure 3 and Figure 6 As shown, in one embodiment, The cross-sections of the first heated bed frame 710 and the second heated bed frame 720 are both U-shaped, with the two ends of the first heated bed frame 710 and the second heated bed frame 720 corresponding to each other.

[0025] In this embodiment, the cross-sections of the first heated bed frame 710 and the second heated bed frame 720 are both U-shaped, which facilitates the placement of the clamp 800 and the rotation and adjustment of the second heated bed frame 720.

[0026] In one implementation, it further includes: The first fixing rod 110 is mounted on the base 100; The first slider 711 is disposed on the first heated bed frame 710. The third drive assembly 600 drives the first heated bed frame 710 to move relative to the base 100, so that the first slider 711 slides along the first fixed rod 110.

[0027] In this embodiment, the first heated bed frame 710 is driven to slide on the base 100 by the third driving component 600, while the first slider 711 slides along the first fixed rod 110, thereby ensuring the stability of the movement of the first heated bed frame 710, and thus the position of the first heated bed frame 710 cover plate clamp 800 and the print head assembly 500 is determined by the position of the first heated bed frame 710 cover plate clamp 800 and the print head assembly 500.

[0028] like Figure 4 As shown, in one embodiment, The third drive component 600 includes: Third motor 610 (corresponding to) Figure 1 and Figure 2 The Y motor in the middle), and the third motor 610 are mounted on the base 100; Two first sprockets 620 are respectively mounted on the base 100 and the output end of the third motor 610; The first chain is mounted on two first sprockets 620, and the first heated bed frame 710 is mounted on the first chain.

[0029] In this embodiment, the first sprocket 620 is driven to rotate by the third motor 610, and the first chain is driven to rotate by the first sprocket 620 on the base 100. The first heated bed frame 710 is placed on the first chain, and the first chain is tensioned by the two first sprockets 620. Then, the movement of the first chain drives the first heated bed frame 710 to move relative to the base 100.

[0030] like Figures 3-4 and Figure 7 As shown, in one embodiment, The second drive component 400 includes: Two second sliders 410 are disposed on the first drive assembly 300; Two second fixing rods 420 are disposed between two second sliders 410; Fourth motor 430 (corresponding to) Figure 1 and Figure 2 The X motor in the middle), and the fourth motor 430 are set on one of the sliders; Two second sprockets 450 are respectively mounted on the output end of the fourth motor 430 and on the slider away from the fourth motor 430; The second chain is fitted between the two second sprockets 450; A sliding seat 440 is mounted on a second chain and slides along a second fixed rod 420. A printhead assembly 500 is mounted on the sliding seat 440.

[0031] In this embodiment, the sliding seat 440 slides on the second fixed rod 420, and the print head assembly 500 is mounted on the sliding seat 440. By sliding the sliding seat 440 assembly on the second fixed rod 420, the position of the print head assembly 500 relative to the clamp 800 can be changed, which facilitates the adjustment of the print head assembly 500. The fourth motor 430 drives the sliding seat 440 to slide along the fixed rod, and its driving method is the same as that of the first sprocket 620 and the first chain.

[0032] like Figures 3-4 and Figure 7 As shown, in one embodiment, The first drive component 300 includes: Two fifth motors 310 (corresponding) Figure 1 and Figure 2 The Z1 and Z2 motors in the middle), and the two fifth motors 310 are both mounted on the bracket 200; Two lead screws 320 are respectively mounted on the output ends of two fifth motors 310, and two second sliders 410 are respectively mounted on the two lead screws 320. When the two lead screws 320 rotate simultaneously, the lead screws 320 drive the second sliders 410 to move in the height direction relative to the bracket 200.

[0033] In this embodiment, the fifth motor 310 drives the lead screw 320 to rotate, thereby driving the two second sliders 410 to move up and down relative to the bracket 200, thereby changing the height between the printhead assembly 500 and the clamp 800. Specifically, the two fifth motors 310 need to be driven simultaneously during use to ensure that the lead screw 320 rotates at the same speed, thereby ensuring that the second slider 410 moves simultaneously. Furthermore, a limiting rod can be provided on the bracket 200, and the second slider 410 is slidably connected to the limiting rod. When the second slider 410 moves along the lead screw 320, the second slider 410 slides along the limiting rod to ensure the stability of the lead screw 320 when rotating, and at the same time ensure the stability of the movement of the second slider 410.

[0034] like Figure 3 and Figure 5 As shown, in one embodiment, Printhead assembly 500 includes: Print head 510 is mounted on slide 440; Sixth motor 520 (corresponding to) Figure 1 and Figure 2 The sixth motor 520 is mounted on the printhead 510 to control the feeding and retraction of the filament filament. Fan 530 is mounted on printhead 510 to cool the nozzles of printhead 510 and the extruded material.

[0035] In this embodiment, the print head 510 slides along the fixed rod with the sliding seat 440, and the filament enters the print head 510. The sixth motor 520 controls the biting and retraction of the filament. Two fans 530 are provided, which are respectively located on the side and front of the print head 510, and respectively cool the nozzle of the print head 510 and the extruded material. Specifically, the printhead 510 has the same structure as the printhead 510 in commonly available printers on the market.

[0036] like Figure 3 and Figure 5 As shown, in one embodiment, The printhead assembly 500 also includes: Consumable sensor 540 is mounted on printhead 510 to detect whether consumables are connected to printhead 510.

[0037] In this embodiment, the consumable sensor 540 is a common infrared sensor, which is used to detect whether consumables have entered the printhead 510.

[0038] Specifically, the printer uses FYSETC's Big-Dipper motherboard as its control board, which can efficiently and accurately control stepper motors, heating components (such as the heated bed and printhead), and various sensors. For motherboard settings and firmware flashing, refer to Duet3D's relevant documentation (https: / / docs.duet3d.com); detailed motherboard settings are attached. Figure 1 For connections of components such as motors and hot junctions, please refer to the appendix. Figure 3-5 .

[0039] After burning the corresponding RepRapFirmwire, users can operate the 3D printer and partition it through the web-based GUI; See the appendix for specific functions. Figure 2 .

[0040] Machine status monitoring: Users can monitor the position parameters of the motion mechanism, the temperature of the MCU, etc. Temperature control: Users can configure the activation of the hot end, maintain the temperature, and control the activation of the hot end here. Temperature monitoring tool: Users can monitor the current temperature of the hot end in real time. Custom macros: Users can upload pre-written G files to the Macros folder and invoke them at any time in the console. Motion axis control: Users can control the movement of each of the XYZ and UV axes individually. G-code Upload: Users can upload G-files stored locally to this site and run the software. To generate a printing path adapted to the five-axis architecture, we used slicing software developed by the authors of an open-source project. This software, based on the RhinocerosGrasshopper plugin, implements a slicing algorithm for conformal printing and multi-axis collaborative path planning and control. The specific process by which this slicing software converts the 3D model into G-code is as follows: First, the user creates a 3D model in the Rhinoceros environment that needs to be conformally printed, namely the base model and the upper model, where the base model needs to match the actual object clamped on the heated bed.

[0041] Next, the Grasshopper plugin is run within Rhinoceros, and the slicing software is opened. In the slicing software, the user needs to specify the base model, the upper model, and the Z-axis boundaries of the upper model at the beginning. This specification uses Grasshopper's built-in interface, allowing direct selection of points, lines, surfaces, and solids within the Rhinoceros environment. Adjustable printing parameters include: print layer height, path width, infill direction, filament diameter, extrusion ratio, and print rate. After adjusting these parameters, the user activates the generation switch, and the software begins running, ultimately outputting a G-code file. The user can directly run the G-code file on a web browser to control the machine and complete the printing process, or run a simulation within the software to observe the general printing process.

[0042] The software's specific slicing algorithm process is mainly divided into three parts: print path generation, tool path generation, and component control, realizing the conversion from 3D model to G-code.

[0043] Print path generation section Input: Base model, upper model, Z-axis boundary, layer height, print width Output: Print path (Rhinoceros curve) The curve is then subdivided into multiple line segments composed of straight lines. Unlike planar 3D printing, for 5-axis printing, the nozzle moves in three-dimensional space during extrusion. Therefore, in addition to layer height, the length of each segment also contributes to determining the resolution of the printed product. Here, the software sets the length of each line segment to 0.2 mm, approximately half the diameter of a typical 3D printing nozzle.

[0044] Toolpath generation section Input: Base model, print path Output: Reference plane, single-segment step size, starting direction vector, ending direction vector, path inflection points, path length Component control section Input: Reference plane, single-segment step size, starting direction vector, ending direction vector, path inflection points, path length. Output: G-code file. Based on the printing parameter settings, the extrusion amount for each path segment is calculated, and combined with the printing rate, the feed rate is calculated. Finally, the control logic for each axis motor is determined, and the final code is generated.

[0045] The functions of each module in each device of this utility model embodiment can be found in the corresponding description in the above method, and will not be repeated here.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A 3D printer, characterized in that, include: Base; The bracket is mounted on the base; A first drive component is disposed on the base; A second drive component is disposed on the first drive component, and the first drive component drives the second drive component to move along the height direction of the bracket. A printhead assembly is disposed on the second drive assembly, and the second drive assembly drives the printhead to move along the parallel direction of the support crossbar; A third drive assembly is disposed on the base; A heated bed assembly is disposed on the base, and the third drive assembly drives the heated bed assembly to move relative to the base; A clamp is mounted on the heated bed assembly. The clamp holds the material and cooperates with the print head assembly for printing. The heated bed assembly drives the clamp to rotate relative to the base and simultaneously drives the clamp to rotate on its own axis.

2. A 3D printer according to claim 1, characterized in that, The heated bed assembly includes: A first heated bed frame is mounted on the base, and the third drive assembly drives the first heated bed frame to move along the base. A second heated bed frame is mounted on the first heated bed frame, and the clamp is mounted on the second heated bed frame; A first motor is mounted on the first heated bed frame, and the first motor drives the second heated bed frame to rotate relative to the first heated bed frame; A second motor is mounted on the second heated bed frame. The second motor drives the clamp to rotate relative to the second heated bed frame. A third chain and a third sprocket are provided between the second motor and the clamp.

3. A 3D printer according to claim 2, characterized in that, Both the first heated bed frame and the second heated bed frame have a "U" shaped cross-section, with the two ends of the first heated bed frame and the second heated bed frame corresponding to each other.

4. A 3D printer according to claim 3, characterized in that, The heated bed assembly also includes: Two connecting shafts are respectively disposed at the two ends of the second heated bed frame and pass through the two ends of the first heated bed frame, with one of the connecting shafts disposed at the output end of the first motor.

5. A 3D printer according to claim 2, characterized in that, Also includes: A first fixing rod is disposed on the base; A first slider is disposed on the first heated bed frame, and the third drive assembly drives the first heated bed frame to move relative to the base so that the first slider slides along the first fixed rod.

6. A 3D printer according to claim 5, characterized in that, The third driving component includes: A third motor is mounted on the base. Two first sprockets are respectively mounted on the base and the output end of the third motor; The first chain is sleeved on the two first sprockets, and the first heated bed frame is mounted on the first chain.

7. A 3D printer according to claim 1, characterized in that, The second driving component includes: Two second sliders are disposed on the first drive component; Two second fixing rods are disposed between the two second sliders; A fourth motor is mounted on one of the sliders; Two second sprockets are respectively disposed on the output end of the fourth motor and on the slider away from the fourth motor; The second chain is fitted between the two second sprockets; A sliding seat is disposed on the second chain and slides along the second fixed rod. The printhead assembly is disposed on the sliding seat.

8. A 3D printer according to claim 7, characterized in that, The first driving component includes: Two fifth motors, both of which are mounted on the bracket; Two lead screws are respectively mounted on the output ends of the two fifth motors, and two second sliders are respectively mounted on the two lead screws. When the two lead screws rotate simultaneously, the lead screws drive the second sliders to move relative to the height of the bracket.

9. A 3D printer according to claim 7, characterized in that, The printhead assembly includes: A printhead, wherein the printhead is disposed on the slide seat; A sixth motor, which is mounted on the print head, controls the feeding and retraction of the filament; A fan is provided on the printhead to cool the printhead nozzles and the extruded material.

10. A 3D printer according to claim 9, characterized in that, The printhead assembly also includes: A consumable sensor is disposed on the print head to detect whether consumables are connected to the print head.

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