3D printing device and multi-color printing method

Abstract

The present application relates to the technical field of 3D printing, and discloses a 3D printing device and a multi-color printing method, which comprise a buffer and a storage box; a plurality of material trays for winding and storing wires are arranged in the storage box; a wire driver is arranged at a discharge port of the storage box; the wire driver is used for conveying the wire to be printed to the buffer and is also used for drawing back the conveyed wire to the storage box; the buffer is arranged between the storage box and a nozzle assembly of the 3D printing device, is used for receiving and storing the wire to be printed, and is also used for conveying the wire to be printed to the nozzle assembly. Through the arrangement of the storage box and the buffer, the problem that the asynchronization of wire conveying affects the operation of the 3D printing device can be effectively avoided; without the need of arranging a plurality of wire channels to convey wires of different colors, the operation and method of multi-color 3D printing are simplified, and the printing efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a 3D printing device and a multi-color printing method. Background Art

[0002] 3D printing technology is a method of constructing three-dimensional objects by printing layer by layer using 3D printing equipment based on the three-dimensional model data of the object.

[0003] When traditional 3D printing equipment performs multi-color printing, multiple extruders and multiple nozzles are usually set up to print different colors of filaments respectively. However, this method usually requires manually inserting the filament into the extruder; or multiple wire channels are set up to transport multiple colors of filaments to one extruder and nozzle, but the structure of setting up multiple wire channels is relatively complex, and the operation and method of changing wires are relatively cumbersome, affecting printing efficiency. In addition, the wire delivery of the wire channel and the extruder may be out of sync, affecting the operation of the 3D printing equipment.

[0004] Therefore, finding a 3D printing device and a multi-color printing method that can solve any of the above technical problems has become an important topic studied by those skilled in the art. Summary of the Invention

[0005] The present invention discloses a 3D printing device and a multi-color printing method, which are used to solve the technical problems existing in existing 3D printing devices and multi-color printing methods, such as unstable wire conveying and complicated color change printing operations, which affect printing operation and printing efficiency.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A buffer device for 3D printing equipment, comprising a buffer and a material storage box;

[0008] The material storage box is provided with a plurality of material trays for winding and storing wires, and the discharge port of the material storage box is provided with a wire drive, which is used to deliver the wire to be printed to the buffer and to draw the delivered wire back into the material storage box;

[0009] The buffer is arranged between the material storage box and the nozzle assembly of the 3D printing device, and is used to receive and store the wire to be printed, and is also used to convey the wire to be printed to the nozzle assembly.

[0010] Optionally, a storage tube and a buffer groove are provided in the buffer, one end of the storage tube is connected to the discharge port of the storage box, and the other end of the storage tube is movably connected to the buffer groove;

[0011] The storage tube is provided with a driving member, and the storage tube can be driven by the driving member to move, thereby driving the other end of the storage tube to move along the direction of the buffer groove.

[0012] Optionally, the driving member is provided with a detector for detecting the moving position of the storage tube;

[0013] When the storage tube moves to a preset first position, the other end of the storage tube moves to the maximum moving distance set in the buffer groove, and the storage box stops conveying the wire to be printed to the buffer; when the storage tube moves to a preset second position, the other end of the storage tube moves to the minimum moving distance set in the buffer groove, and the storage box starts conveying the wire to be printed to the buffer.

[0014] Optionally, a protective portion is further provided at one end of the buffer groove away from the storage tube, and the buffer groove is connected to the nozzle assembly of the 3D printing device through the protective portion.

[0015] A 3D printing device, comprising a nozzle assembly and a buffer device as described in any one of the above items;

[0016] The nozzle assembly includes a print head and an extruder for conveying wire to the print head, and the extruder is connected to the buffer of the buffer device; the extruder is also provided with a wire detector for detecting the wire.

[0017] Optionally, a cutter for cutting the wire is provided between the nozzle assembly and the buffer.

[0018] Optionally, the speed at which the material storage box of the buffer device conveys the wire is greater than the speed at which the extruder conveys the wire.

[0019] A multi-color printing method of a 3D printing device as described in any one of the above, comprising:

[0020] The filament to be printed is transported from the material storage box to the nozzle assembly through the buffer;

[0021] When the filament to be printed is finished printing, the storage box draws back the filament that has finished printing, and delivers the filament to be changed color to the nozzle assembly through the buffer.

[0022] Optionally, the filament to be printed is transported from the material storage box to the nozzle assembly via the buffer, specifically including:

[0023] The buffer receives the wire to be printed delivered by the storage box;

[0024] Determine whether the filament to be printed in the buffer has reached the set maximum value;

[0025] If so, stop receiving the wire to be printed delivered by the storage box.

[0026] Optionally, after the filament to be printed is transported from the material storage box to the nozzle assembly via the buffer, the method further includes:

[0027] Determine whether the nozzle assembly has received the filament to be printed;

[0028] If so, print according to the predetermined model;

[0029] If not, continue receiving within the set response time;

[0030] When the set response time is exceeded and the filament in the current printing order is still not received, the device is repaired and the process returns to the step of transporting the filament to be printed from the material storage box to the nozzle assembly via the buffer.

[0031] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages compared with the prior art:

[0032] 1. When a print command is received, the wire to be printed is transported to the buffer through the material tray of the material storage box; the buffer stores the wire to be printed, and the wire in the buffer can be pushed by the material tray to transport the wire to the nozzle assembly for printing; the buffer receives and stores the wire to adjust the wire transportation to avoid wire accumulation at the nozzle assembly, effectively preventing the possible asynchrony or speed error between the wire transportation of the material storage box and the reception of the wire by the nozzle assembly, which may cause wire accumulation and unstable transportation.

[0033] 2. When the filament to be printed is finished printing and needs to be changed in color for printing, the material tray of the material storage box withdraws the filament that has been printed, and transports the filament to be changed in color through the buffer to the nozzle assembly for color change printing.

[0034] Compared with the existing technology, the present invention adds a buffer device in the 3D printing equipment, winds and stores the wire through the material tray of the storage box, and can be driven by the wire driver to convey the wire, so as to realize automatic replenishment of the wire; the buffer provides a buffer space for the wire to prevent accumulation and other problems such as poor operation during the wire conveying process; and there is no need to set up multiple wire channels to print wires of multiple colors, which simplifies the operation and method of multi-color printing and effectively improves printing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 is a structural diagram of the buffer of Example 1;

[0037] Figure 2 This is a structural block diagram of the 3D printing device of Example 2;

[0038] Figure 3 This is a flow chart of the multi-color 3D printing method of Example 3. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0041] 3D printing technology typically heats a solid, low-melting-point, linear material (such as PLA or ABS) to a semi-molten state and then extrudes it for 3D printing. The filament of the present invention refers to a solid, linear material.

[0042] Example 1

[0043] The buffer device of this embodiment can be used to connect with the nozzle assembly of the 3D printing device to convey the wire to the nozzle assembly for 3D printing, including a buffer (attached Figure 1 ) and a material storage box (not shown in the drawings); the material storage box of this embodiment is used to store a variety of wires and can automatically transport the wires to be printed according to predetermined instructions; the buffer of this embodiment is used to receive and store the wires to be printed, and through the movable connection between the storage tube and the buffer groove, the wires are flexibly stored and transported, achieving a buffering effect, and preventing unstable wire transportation from affecting the operation of the 3D printing equipment;

[0044] The material storage box is provided with a plurality of material trays for winding and storing wires, and the discharge port of the material storage box is provided with a wire drive, which is used to deliver the wire to be printed to the buffer and also to draw the delivered wire back into the material storage box;

[0045] The buffer is located between the material storage box and the nozzle assembly of the 3D printing device, and is used to receive and store the wire to be printed, and is also used to transport the wire to be printed to the nozzle assembly.

[0046] It should be noted that the speed at which the material tray of the material storage box conveys the wire is certain, while the speed at which the nozzle assembly prints the wire varies according to the printing model. If no buffer is provided, if the speed at which the nozzle assembly prints the wire slows down, that is, the speed at which the extruder conveys the wire slows down, wire accumulation is likely to occur; if the speed at which the nozzle assembly prints the wire speeds up, that is, the speed at which the extruder conveys the wire speeds up, wire disconnection is likely to occur. All of the above situations will affect the operation of the 3D printing equipment.

[0047] Specifically, a plurality of material trays are provided in the material storage box, and wire is wound and stored on each material tray. The material tray can be driven to rotate, so as to release the wound wire or rewind it onto the material tray; a wire driver is provided at the discharge port of the material storage box. When a print instruction is received, the corresponding material tray releases the wire to be printed, and the wire to be printed is conveyed to the buffer through the discharge port and driven by the wire driver; when the wire to be printed is printed, that is, when a color change instruction is received, the wire driver withdraws the conveyed wire back into the material storage box, and the corresponding material tray rewinds it onto the material tray. At the same time, another material tray releases the wire to be changed in color, and then conveys it to the buffer through the wire driver. As a specific embodiment, each material tray is provided with a corresponding discharge port, and each discharge port is provided with a wire driver to convey the wire on the material tray to the buffer.

[0048] The buffer is connected to the material storage box to receive and store the wire to be printed delivered by the material storage box. The buffer is also connected to the nozzle assembly to deliver the stored wire to be printed to the nozzle assembly for printing. When a print instruction is received, the buffer receives and stores the wire to be printed, providing a buffer space for the wire to be printed, avoiding wire accumulation caused by the speed of the material storage box conveying the wire and the speed of the nozzle assembly printing the wire being out of sync, thereby improving the printing quality, and the wire stored in the buffer can be continuously delivered to the nozzle assembly to avoid short wires. When a color change instruction is received, the wire that has completed printing in the buffer is withdrawn by the material storage box, and at the same time the buffer receives and stores the wire to be changed in color, and then delivers the wire to be changed in color to the nozzle assembly, thereby eliminating the need to set up multiple extruders and nozzles to print wires of multiple colors, simplifying the operation and method of multi-color 3D printing and effectively improving printing efficiency.

[0049] It should be noted that the wire to be printed is one of the wires wound on several material trays. When a printing instruction is received, the material storage box automatically identifies the wire to be printed and conveys it. Similarly, the wire to be changed in color is also one of the wires wound on several material trays. When a color change instruction is received, the wire to be printed completes printing, and the material storage box automatically identifies the wire to be changed in color and conveys it. The wire in the buffer can be driven by the driving force of the wire driver to convey the wire to the nozzle assembly for printing.

[0050] Further, see Figure 1 A storage tube 101 and a buffer groove 102 are provided in the buffer. One end of the storage tube 101 is connected to the discharge port of the storage box to receive the wire conveyed by the storage box; the other end of the storage tube 101 is movably connected to the buffer groove 102, and the end of the buffer groove 102 away from the storage tube 101 is connected to the nozzle assembly;

[0051] A driving member 103 is provided on the storage tube. The storage tube 101 can be driven to move by the driving member 103 , thereby driving the other end of the storage tube 101 to move along the direction of the buffer groove 102 .

[0052] Specifically, the buffer is arranged between the material storage box and the nozzle assembly. One end of the storage tube 101 in the buffer is fixed in the buffer and connected to the discharge port of the material storage box, which is used to receive and store the wire conveyed by the material storage box; the other end of the storage tube 101 is movably connected to the buffer groove. When printing starts, the storage tube 101 is filled with the wire conveyed by the material storage box. The wire is continuously conveyed and the other end of the storage tube 101 is driven to move away from the buffer groove 102, so that the wire in the storage tube 101 can be pushed into the buffer groove 102 to store more wire to prevent the wire from overflowing. The wires are accumulated, thereby providing a buffering effect for the wires; when the buffer channel 102 is filled with wires, that is, the buffer is filled with wires, the storage box will stop conveying the wires to the buffer, and the driving member 103 will drive the other end of the storage tube 101 to move toward the buffer groove 102, thereby pushing the stored wires to the nozzle assembly; when the wires in the buffer groove 102 are conveyed, the storage box again conveys the wires to the storage tube 101 and drives the other end of the storage tube 101 to move away from the buffer groove 102, so that the buffer groove 102 is filled with wires again. Thus, through the movement of the storage tube 101 in the buffer groove 102, a dynamic balance between the storage and delivery of the wires is achieved.

[0053] It should be noted that, in actual use, the storage box conveys the wire and the nozzle assembly prints the wire simultaneously. Since the printing speed of the nozzle assembly on the wire varies according to the different printing models, in order to avoid the storage box conveying the wire too fast and the nozzle assembly printing the wire slowly, resulting in wire accumulation, the buffer groove 102 and the storage tube 101 provide a buffering effect for the wire conveyance to prevent the wire from accumulating in the nozzle assembly and clogging the nozzle; if the nozzle assembly prints the wire faster, the wire stored in the storage tube 101 and the buffer groove 102 can also be supplied to the nozzle assembly.

[0054] Exemplarily, the buffer groove 102 is a groove that matches the storage tube 101, so that the other end of the storage tube 101 can move along the buffer groove 102; the buffer groove 102 can also be a cylindrical channel that is compatible with the storage tube 101, etc., which is not specifically limited in this embodiment; the length of the buffer groove 102 can also be adjusted according to actual usage requirements.

[0055] Furthermore, the driving member 103 is provided with a detector for detecting the moving position of the storage tube 101;

[0056] Specifically, when the storage tube 101 moves to the preset first position (as shown in the attached Figure 1 As shown in the figure), the other end of the storage tube 101 moves to the maximum moving distance set in the buffer groove 102, that is, the wire material that the buffer groove 102 can store reaches the maximum value, and the material storage box will stop conveying the wire material to be printed to the buffer; because the nozzle assembly continuously prints the wire material, during this process, the driving member 103 will drive the other end of the storage tube 101 to move in the direction close to the buffer groove 102, that is, the storage tube 101 moves from the preset first position to the preset second position, thereby providing wire material for the printing of the nozzle assembly; until when the storage tube 101 moves to the preset second position, the other end of the storage tube 101 moves to the minimum moving distance set in the buffer groove 102, that is, the wire material in the buffer groove 102 is exhausted, and the material storage box starts to re-convey the wire material to be printed to the storage tube 101 of the buffer, and the storage tube 101 pushes the wire material into the buffer groove 102, and at the same time, the storage tube 101 moves from the preset second position to the preset first position.

[0057] It should be noted that the storage tube 101 can reciprocate between a preset first position and a preset second position, thereby adjusting the moving distance of the other end of the storage tube 101 in the buffer groove 102, that is, adjusting the position of the other end of the storage tube 101 in the buffer groove 102, and then adjusting the buffer length of the wire, so as to achieve the purpose of stable transportation of the wire.

[0058] As a specific embodiment, the storage tube 101 is a linear storage tube, or a U-shaped storage tube, preferably a U-shaped storage tube, one end of the U-shaped storage tube is provided with a wire inlet hole, the wire inlet hole is connected to the discharge port of the storage box, the other end of the U-shaped storage tube is movably connected to the buffer groove 102, the end of the buffer groove 102 away from the U-shaped storage tube is provided with a wire outlet hole, and the wire outlet hole is connected to the nozzle assembly.

[0059] Furthermore, a protective portion 104 is provided at one end of the buffer groove 102 away from the storage tube 101 , and the end of the buffer groove 102 away from the storage tube 101 is connected to the nozzle assembly through the protective portion 104 .

[0060] Specifically, the end of the buffer groove 102 away from the storage tube 101 is connected to the nozzle assembly through the protective part 104, and the wire is transported to the nozzle assembly through the protective part 104; when the storage tube 101 moves to the preset second position, the wire in the buffer groove 102 is exhausted. At this time, the storage box replenishes the wire to the storage tube 101 and the buffer groove 102. To avoid the wire being disconnected, the wire remaining in the protective part 104 will be transported to the nozzle assembly for printing. At the same time, after the buffer groove 102 receives the pushed wire, the above process is repeated again, which will not be repeated here, so as to ensure the continuity of printing and improve the quality of 3D printing.

[0061] Example 2

[0062] See also Figure 2 This embodiment provides a 3D printing device, including a nozzle assembly 3, and also includes a buffer device as any one of the embodiments of the first embodiment; therefore, the specific structure and technical effects of the buffer device described in the first embodiment are also referred to in this embodiment, and have the same technical effects.

[0063] The nozzle assembly 1 includes a print head and an extruder for conveying wire to the print head. The extruder is connected to a buffer 2 of a buffer device. A wire detector for detecting the wire is also provided on the extruder.

[0064] Specifically, the filaments of various colors are stored on the several trays of the hopper 1. These filaments are then fed to the nozzle assembly 3 via the buffer 2. The extruder of the nozzle assembly 3 receives the filaments and feeds them to the printhead for printing. A filament detector on the extruder detects whether the filament fed by the buffer 2 is the filament to be printed, preventing the wrong filament from being received and affecting print quality.

[0065] Furthermore, a cutter 5 for cutting the wire is provided between the nozzle assembly 3 and the buffer 2, and a controller 4 is also included. The controller 4 is used to control the cutter 5 to cut the wire according to the color change instruction, and is also used to control the storage box 1 to convey or withdraw the wire according to the printing instruction or color change instruction.

[0066] Specifically, when a printing instruction is received, the controller 4 controls the corresponding material tray in the storage box 1 to transport the wire to be printed to the buffer 2; when a color change instruction is received, that is, after the wire to be printed is completed, the cutter 5 is controlled by the controller 4 to cut the wire, and at the same time controls the material tray of the storage box 1 to withdraw the cut wire from the buffer 2 and rewind it on the material tray, thereby improving the utilization rate of the wire and controlling the cost of 3D printing.

[0067] Furthermore, the speed at which the material storage box 1 of the buffer device conveys the wire is greater than the speed at which the extruder conveys the wire.

[0068] Preferably, the speed at which the material tray in the storage box 1 conveys the wire is three times the speed at which the extruder conveys the wire, thereby ensuring that the speed at which the storage box 1 conveys the wire to the buffer 2 can keep up with the speed at which the extruder conveys the wire to the print head for printing, further ensuring the smooth operation of the 3D printing equipment.

[0069] The printing process of the 3D printing device of this embodiment is specifically as follows: when a print instruction is received, the material tray of the storage box 1 conveys the wire to be printed to the buffer 2 through the discharge port; the buffer 2 receives and stores the wire to be printed, and conveys it to the extruder of the nozzle assembly; the extruder detects the wire to be printed, and pushes it to the print head of the nozzle assembly 3, and the print head prints according to the predetermined model; when a color change instruction is received and color change printing is required, the controller 4 controls the cutter 5 to cut the wire, and the material tray retracts the printed wire, and at the same time, the material tray with the wire to be changed in the material box 1 pushes the wire to be changed in color to the buffer, and the buffer then conveys the wire to be changed in color to the nozzle assembly 3 for color change printing.

[0070] Example 3

[0071] This embodiment provides a multi-color printing method, which uses a 3D printing device as described in any one of the second embodiment. Therefore, the specific structure and technical effects of the 3D printing device described in the second embodiment are also referenced in this embodiment and have the same technical effects.

[0072] See Figure 3 , a multi-color printing method, specifically comprising:

[0073] Step 1: transport the wire to be printed from the material storage box to the nozzle assembly through the buffer;

[0074] Step 2: When the filament to be printed is finished printing, the storage box withdraws the filament that has finished printing, and delivers the filament to be changed color to the nozzle assembly through the buffer.

[0075] Furthermore, step 1 specifically includes:

[0076] Step 101: The buffer receives the wire to be printed delivered by the storage box;

[0077] Specifically, the storage tube in the buffer receives the wire to be printed delivered by the storage box, and the wire to be printed is located in the storage tube;

[0078] Step 102, judging whether the wire to be printed in the buffer reaches a set maximum value;

[0079] Step 103, if the wire to be printed in the buffer does not reach the set maximum value, continuing to receive the wire to be printed delivered by the storage box;

[0080] Step 104, if the wire to be printed in the buffer reaches the set maximum value, stopping receiving the wire to be printed delivered by the storage box.

[0081] It should be noted that the set maximum value of the wire to be printed in the buffer is the maximum value of the length of the wire that fills the storage tube and the buffer groove in the buffer in Embodiment One, and the processes and principles of the delivery of the wire and the printing of the wire are consistent with those described in Embodiment One and Embodiment Two, which will not be described here.

[0082] Further, after the wire to be printed is delivered from the storage box to the nozzle assembly through the buffer in Step 1, the process further includes:

[0083] judging whether the nozzle assembly receives the wire to be printed;

[0084] if yes, printing according to a predetermined model;

[0085] if no, continuously receiving within a set response time;

[0086] when the wire in the current printing order is still not received within the set response time, the device is repaired, and the process returns to Step 1: delivering the wire to be printed from the storage box to the nozzle assembly through the buffer.

[0087] Specifically, after the wire to be printed is delivered to the nozzle assembly through the buffer, the extruder of the nozzle assembly receives the wire, and at the same time, the wire detector on the extruder detects whether the extruder accurately receives the wire and whether the received wire is the wire to be printed. If yes, the wire to be printed is printed according to a predetermined model; if the extruder always does not receive the wire or the received wire is not the wire to be printed within a set response time, it is determined that the device is malfunctioning, and after the device is repaired to eliminate the malfunction, the wire to be printed is delivered to the nozzle assembly through the buffer again to ensure accurate and high-quality multi-color 3D printing.

Claims

1. A buffer device for a 3D printing device, characterized in that: Including buffer and storage box; The material storage box is provided with a plurality of material trays for winding and storing wires, and the discharge port of the material storage box is provided with a wire drive, which is used to deliver the wire to be printed to the buffer and to draw the delivered wire back into the material storage box; The buffer is provided between the material storage box and the nozzle assembly of the 3D printing device, and is used to receive and store the wire to be printed, and is also used to transport the wire to be printed to the nozzle assembly; A storage tube and a buffer groove are provided in the buffer, one end of the storage tube is fixed in the buffer and connected to the discharge port of the storage box, and the other end of the storage tube is movably connected to the buffer groove; the end of the buffer groove away from the storage tube is connected to the nozzle assembly; The storage tube is provided with a driving member, and the storage tube can be driven by the driving member to move, thereby driving the other end of the storage tube to move along the direction of the buffer groove.

2. The buffer device of the 3D printing equipment according to claim 1, characterized in that: The driving member is provided with a detector for detecting the moving position of the storage tube; When the storage tube moves to a preset first position, the other end of the storage tube moves to the maximum moving distance set in the buffer groove, and the storage box stops conveying the wire to be printed to the buffer; when the storage tube moves to a preset second position, the other end of the storage tube moves to the minimum moving distance set in the buffer groove, and the storage box conveys the wire to be printed to the buffer.

3. The buffer device of the 3D printing equipment according to claim 2, characterized in that: A protective portion is further provided at one end of the buffer groove away from the storage tube, and the protective portion is connected to the nozzle assembly.

4. A 3D printing device, comprising a nozzle assembly, characterized in that: The 3D printing device further comprises a buffer device according to any one of claims 1 to 3; The nozzle assembly includes a print head and an extruder for conveying wire to the print head, and the extruder is connected to the buffer of the buffer device; the extruder is also provided with a wire detector for detecting the wire.

5. The 3D printing device according to claim 4, characterized in that: A cutter for cutting the wire is provided between the nozzle assembly and the buffer; and a controller for controlling the cutter and the storage box of the buffer device is also included.

6. The 3D printing device according to claim 4, characterized in that: The speed at which the material storage box of the buffer device conveys the wire is greater than the speed at which the extruder conveys the wire.

7. A multi-color printing method, applied to the 3D printing device according to any one of claims 4 to 6, characterized in that: include: The filament to be printed is transported from the material storage box to the nozzle assembly through the buffer; When the filament to be printed is finished printing, the storage box draws back the filament that has finished printing, and delivers the filament to be changed color to the nozzle assembly through the buffer.

8. The multi-color printing method according to claim 7, characterized in that: The filament to be printed is transported from the storage box to the nozzle assembly through the buffer, specifically including: The buffer receives the wire to be printed delivered by the storage box; Determine whether the filament to be printed in the buffer has reached the set maximum value; If so, stop receiving the wire to be printed delivered by the storage box.

9. The multi-color printing method according to claim 7, wherein: After the filament to be printed is transported from the material storage box to the nozzle assembly through the buffer, the process also includes: Determine whether the nozzle assembly has received the filament to be printed; If yes, print according to the predetermined model; If not, continue receiving within the set response time; When the set response time is exceeded and the filament in the current printing order is still not received, the device is repaired and the process returns to the step of transporting the filament to be printed from the material storage box to the nozzle assembly via the buffer.

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