Fused deposition 3D printer

Abstract

The application relates to the field of 3D printing technology, in particular to a fused deposition 3D printer, which comprises a fused printer shell, the inside of the fused printer shell is provided with a printing cavity; the fused printer shell can process printing wire materials into powder through efficient multi-material printing, and can perform printing operation through use of multiple different raw materials during single printing operation; meanwhile, a support material recycling mechanism can recycle a support frame used for supporting a printed part during printing operation; through the technical scheme, the printing cost of the equipment can be reduced, the time required for melting the printing wire material can be reduced, and the equipment can perform printing operation through multiple different types of printing wire materials during single printing operation, so that the fused printer shell can meet diversified printing demands and expand the application field; the problems of high printing cost and low equipment flexibility are solved.

Description

Technical Field

[0001] The present invention relates to the field of 3D printing technology, in particular to a fused deposition modeling 3D printer. Background Art

[0002] 3D printing, also known as additive manufacturing, is a manufacturing technology that creates three-dimensional objects by stacking materials layer by layer. Unlike traditional subtractive manufacturing, 3D printing does not require removing any parts from a piece of material. Instead, it directly adds material layer by layer according to the instructions of the digital model until the final three-dimensional object is formed.

[0003] Fused deposition modeling, also known as filament molding or fused filament fabrication, shares the same core technical principles and applications. A fused deposition modeling 3D printer heats a thermoplastic material (such as ABS or PLA) to a molten state, then extrudes it layer by layer through a nozzle onto a print platform. The material solidifies upon cooling, gradually building a three-dimensional object.

[0004] However, when using this fused deposition modeling 3D printer, sometimes it is necessary to print support brackets at the edge of the object in order to support the object that has not been fully printed. When printing is completed, the support brackets need to be removed and discarded. This behavior leads to waste of printing materials, thereby increasing the printing cost of the equipment. In addition, due to the differences in thermal stability, viscosity and fluidity of different printing raw materials, when using the fused deposition modeling 3D printer for a single printing operation, it is impossible to use a variety of different raw materials for printing operations, and its flexibility is poor. In addition, the printing efficiency and printing accuracy of this fused deposition modeling 3D printer are low; therefore, it does not meet the existing needs. For this reason, we have proposed a fused deposition modeling 3D printer. Summary of the Invention

[0005] The purpose of the present invention is to provide a fused deposition modeling 3D printer to solve the problems raised in the above-mentioned background technology. When using this fused deposition modeling 3D printer, it is sometimes necessary to print support brackets at the edge of the object in order to support the object that has not been fully printed. When printing is completed, the support brackets need to be removed and discarded. This behavior leads to waste of printing materials, thereby increasing the printing cost of the equipment. In addition, since different printing raw materials have certain differences in thermal stability, viscosity and fluidity, when using the fused deposition modeling 3D printer for a single printing operation, it is impossible to use a variety of different raw materials to perform printing operations, and its flexibility is poor. In addition, the printing efficiency and printing accuracy of this fused deposition modeling 3D printer are low.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fused deposition model 3D printer, comprising a fused deposition model housing, a printing chamber disposed within the fused deposition model housing, the interior of the printing chamber being fixedly mounted to a movable bracket, a multi-material high-efficiency printing nozzle being fixedly mounted to one side of an outer surface of the movable bracket, the multi-material high-efficiency printing nozzle comprising a print head mounting housing, a heater, a plurality of feed pipes, a number of printing wires equal to the number of feed pipes, a number of printing nozzles equal to the number of feed pipes, and a synchronous rotation mechanism, wherein the heater is fixedly mounted in the middle of the lower end surface of the print head mounting housing;

[0007] The plurality of conveying pipes are installed in an arc shape inside the print head mounting housing, and the conveying pipes are connected to the print head mounting housing via a roller bearing;

[0008] The plurality of printing nozzles are mounted in an arc shape on the outer side of the lower end surface of the print head mounting housing, the position of the feed pipe corresponds to the position of the printing nozzles, and the top end of the printing nozzle is located inside the feed pipe;

[0009] The bottom ends of the plurality of printing strands are respectively located on the upper sides of the interiors of the plurality of feed tubes. The plurality of printing strands are of different types. A crushing roller installed inside the feed tube is provided on both sides below each of the printing strands. The synchronous rotation mechanism can synchronously drive all the crushing rollers to rotate.

[0010] Each printing nozzle is provided with a support material recycling mechanism fixedly mounted on the outer surface of the print head mounting housing on one side, the support material recycling mechanism comprising a feeding pipe, a support material cutting hopper, an auger feed rod, a crushing rod, a plurality of cutting knives and a synchronous transmission mechanism, the feeding pipe being fixed to the lower end surface of the support material cutting hopper, the support material cutting hopper being in communication with the interior of the printing nozzle via the feeding pipe, and the auger feed rod being located inside the feeding pipe;

[0011] The crushing rod is located inside the supporting material cutting hopper, and the plurality of cutting knives are fixedly sleeved on the outer surface of the crushing rod. The synchronous transmission mechanism can synchronously drive the crushing rod to rotate while driving the auger feeding rod to rotate.

[0012] Preferably, a control panel is fixedly mounted on one side of the outer surface of the melting printer housing, and the movable bracket, the multi-material high-efficiency printing nozzle and the support material recycling mechanism are all electrically connected to the control panel.

[0013] Preferably, the synchronous rotation mechanism includes a grinding motor, the outer side of the grinding motor is provided with a motor heat insulation shell fixed to the inside of the print head mounting shell, and the upper end surface of the motor heat insulation shell is provided with a plurality of through holes.

[0014] Preferably, the output shaft of the grinding motor is connected to the motor shaft through a coupling, and the lower side of the outer surface of the motor shaft is fixedly sleeved on the first gear, and the first gear is engaged with a plurality of second gears whose number is the same as the feed pipe, and the plurality of second gears are respectively fixedly sleeved on the outer surfaces of a plurality of feed pipes.

[0015] Preferably, a fourth gear fixed to the inside of the print head mounting housing is provided above the second gear, and a third gear is meshed on both sides of the inner wall of the fourth gear. The two third gears connected to both sides of the inner wall of the same fourth gear are respectively fixedly mounted on the lower sides of the outer surfaces of the two crushing rollers located inside the same feed pipe.

[0016] Preferably, the multi-material high-efficiency printing nozzle further comprises a plurality of wire guide heads, the number of which is the same as that of the feed pipes, the plurality of wire guide heads being respectively mounted at the middle position of the upper end surfaces of the plurality of feed pipes via roller bearings, the inner wall of the wire guide head being in contact with the outer surface of the printing wire, and the wire guide head being slidably connected to the printing wire;

[0017] A feeding tray mounted on the upper end surface of the melting printer housing is provided above the multi-material high-efficiency printing nozzle, and all the printing wire materials pass through the feeding tray.

[0018] Preferably, the synchronous transmission mechanism includes a heat-conducting shell, a stepper motor is fixedly installed on one side of the inside of the heat-conducting shell, the output shaft of the stepper motor is connected to the transmission shaft through a coupling, and the surface of the transmission shaft facing the auger feed rod is fixed between the auger feed rod.

[0019] Preferably, a first bevel gear is fixedly sleeved on one side of the outer surface of the transmission shaft, the first bevel gear is meshed with a second bevel gear, the axis of the second bevel gear is connected to the bevel gear transmission shaft, a third bevel gear is fixedly sleeved on one side of the outer surface of the bevel gear transmission shaft, and the third bevel gear is meshed with a fourth bevel gear fixedly sleeved on the lower side of the outer surface of the crushing rod.

[0020] Preferably, the outer surfaces of the top end and the bottom end of the crushing rod are each provided with a conical support sleeve through a roller bearing sleeve, and both sides of the outer surface of the crushing rod are fixedly connected with a support rod fixed to the inner wall of the supporting material cutting hopper;

[0021] A sealing cover is provided above the crushing rod and is installed on the upper side of the outer surface of the support material cutting hopper through a threaded structure.

[0022] Preferably, a metal cover plate is provided on one side of the stepper motor and is located on the outer surface of the heat-conducting housing, and the stepper motor and the metal cover plate are fixed by screws.

[0023] The present invention can synchronously drive the pulverizing rollers located inside all the feed pipes to rotate through the synchronous rotating mechanism in the multi-material high-efficiency printing nozzle. The rotating pulverizing rollers can pulverize different types of printing wire materials located inside different feed pipes to process them into powder. Processing the printing wire materials into powder helps the material reach the melting temperature faster during the heating process, and the fine powder printing wire material particles can achieve a thinner layer thickness, and a variety of different melted printing wire materials will respectively enter the interior of the corresponding printing nozzles, so that this high-efficiency printing nozzle can use a variety of different raw materials to perform printing operations in a single printing operation. The above technical solution can be more The faster the melting of the printing wire, the shorter the time required to melt the printing wire. The fine powder particles of the printing wire can achieve a thinner layer thickness, thereby improving the accuracy and detail of the printed parts. This makes the surface of the printed object smoother and more delicate, reducing the workload of post-processing. The powder printing wire has better filling properties during the printing process and can more fully fill the gaps in the printed layer, reducing material waste. At the same time, through a variety of different types of printing wires and corresponding printing nozzles, the device can use a variety of different types of printing wires to perform printing operations in a single printing job. This enables the fusion printer housing to meet more diverse printing needs and expand its application areas.

[0024] The present invention removes the support frame used to support the printed part after the printing job is completed, and places it into the corresponding support material cutting hopper. The synchronous transmission mechanism located in the support material recycling mechanism can drive the cutting knife located inside the support material cutting hopper to rotate, so as to cut the support frame into particles. The particles will roll into the inside of the feeding tube under the action of gravity and be heated into liquid inside the feeding tube. The liquid printing wire material will be pushed into the inside of the corresponding printing nozzle by the rotating auger transfer rod located inside the feeding tube, so as to be recycled. The above technical solution can recycle and reuse the support frame, thereby reducing material waste, improving material utilization, and reducing the demand for new raw materials and procurement costs. Enterprises that use the melting printer shell for production operations can complete more printing tasks without increasing additional material costs, thereby reducing the overall production cost of printed parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0026] Figure 2 This is a front view of the internal structure of the present invention;

[0027] Figure 3 For the present invention Figure 2A magnified view of the structure at point A;

[0028] Figure 4 For the present invention Figure 3 A magnified view of the structure at B in the middle;

[0029] Figure 5 For the present invention Figure 3 A magnified view of the structure at C in the middle;

[0030] Figure 6 For the present invention Figure 5 Enlarged view of the structure at point D in the middle.

[0031] Figure: 1. Melt printer housing; 2. Support material recycling mechanism; 201. Heat-conducting housing; 202. Feeding tube; 203. Support material cutting hopper; 204. Stepper motor; 205. Drive shaft; 206. Auger feed rod; 207. First bevel gear; 208. Second bevel gear; 209. Bevel gear drive shaft; 210. Third bevel gear; 211. Fourth bevel gear; 212. Crushing rod; 213. Cutting blade; 214. Cone shaped support sleeve; 215, support rod; 216, sealing cover; 3, printing chamber; 4, movable bracket; 5, print head mounting housing; 6, heater; 7, grinding motor; 8, motor shaft; 9, first gear; 10, second gear; 11, feed pipe; 12, wire guide head; 13, wire for printing; 14, crushing roller; 15, third gear; 16, fourth gear; 17, printing nozzle; 18, motor insulation housing; 19, control panel; 20, feed tray. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] See also Figures 1 to 6 The present invention provides a fused deposition model 3D printer, comprising a fused printer housing 1, a printing chamber 3 being provided inside the fused printer housing 1, a movable bracket 4 being fixedly mounted inside the printing chamber 3, a multi-material high-efficiency printing nozzle being fixedly mounted on one side of an outer surface of the movable bracket 4, the multi-material high-efficiency printing nozzle comprising a print head mounting housing 5, a heater 6, a plurality of feed pipes 11, a number of printing wires 13 equal to the number of the feed pipes 11, a number of printing nozzles 17 equal to the number of the feed pipes 11, and a synchronous rotation mechanism, wherein the heater 6 is fixedly mounted in the middle position of the lower end surface of the print head mounting housing 5;

[0034] A plurality of conveying pipes 11 are installed in an arc shape inside the print head mounting housing 5, and the conveying pipes 11 are connected to the print head mounting housing 5 via roller bearings;

[0035] A plurality of printing nozzles 17 are mounted in an arc shape on the outer side of the lower end surface of the print head mounting housing 5. The position of the feed pipe 11 corresponds to the position of the printing nozzles 17, and the top end of the printing nozzle 17 is located inside the feed pipe 11.

[0036] The bottom ends of the multiple printing wire materials 13 are respectively located on the upper sides of the multiple conveying tubes 11. The types of the multiple printing wire materials 13 are different. A crushing roller 14 installed inside the conveying tube 11 is provided on both sides below each printing wire material 13. The synchronous rotation mechanism can synchronously drive all the crushing rollers 14 to rotate.

[0037] A control panel 19 is fixedly mounted on one side of the outer surface of the melting printer housing 1, and the movable bracket 4, the multi-material high-efficiency printing nozzle and the support material recycling mechanism 2 are all electrically connected to the control panel 19; the movable bracket 4, the multi-material high-efficiency printing nozzle and the support material recycling mechanism 2 can be controlled through the control panel 19.

[0038] Furthermore, the multi-material high-efficiency printing nozzle also includes a plurality of wire guide heads 12, the same number as the feed tubes 11. The plurality of wire guide heads 12 are respectively mounted at the middle position of the upper end surface of the plurality of feed tubes 11 via roller bearings. The inner wall of the wire guide head 12 is in contact with the outer surface of the printing wire 13, and the wire guide head 12 and the printing wire 13 are slidably connected.

[0039] A feed tray 20 is provided above the multi-material high-efficiency printing nozzle and is mounted on the upper end surface of the melting printer housing 1, and all printing wires 13 pass through the feed tray 20. When using the multi-material high-efficiency printing nozzle, the printing wire 13 is first passed through the feed tray 20 and its bottom end is inserted into the upper side of the corresponding printing nozzle 17 through the wire guide head 12.

[0040] The synchronous rotation mechanism provided by the present invention includes a grinding motor 7, the outer side of the grinding motor 7 is provided with a motor heat-insulating shell 18 fixed to the inside of the print head mounting shell 5, and the upper end surface of the motor heat-insulating shell 18 is provided with a plurality of through holes; the output shaft of the grinding motor 7 is connected to the motor shaft 8 through a coupling, the lower side of the outer surface of the motor shaft 8 is fixedly sleeved on the first gear 9, the first gear 9 is meshed with a plurality of second gears 10 whose number is the same as the feed pipe 11, and the plurality of second gears 10 are respectively fixedly sleeved on the outer surfaces of the plurality of feed pipes 11; when all the printing wires 13 are installed, the heater 6 is started to heat the print nozzles 17 located around it and the bottom end of the feed pipe 11 in contact with the print nozzle 17. When the heater 6 is started, the grinding motor 7 is started, and the motor heat-insulating shell 18 located on the outer side of the grinding motor 7 can prevent the grinding motor 7 from being affected by the high temperature generated by the heater 6;

[0041] The grinding motor 7 can drive the motor shaft 8 connected to it and the first gear 9 fixedly sleeved on the outer surface of the motor shaft 8 to rotate. The rotating first gear 9 can drive the second gear 10 meshing with it and the feed pipe 11 fixed inside the second gear 10 to rotate together.

[0042] A fourth gear 16 is provided above the second gear 10 and is fixed to the interior of the print head mounting housing 5. A third gear 15 is meshed on both sides of the inner wall of the fourth gear 16. The two third gears 15 connected to the inner wall of the same fourth gear 16 are respectively fixedly sleeved on the underside of the outer surfaces of two crushing rollers 14 located inside the same feed pipe 11. Because the fourth gear 16 is fixed to the print head mounting housing 5, when the feed pipe 11 rotates, the fourth gear 16 does not rotate with it.

[0043] When the feeding pipe 11 rotates, the two crushing rollers 14 on both sides thereof will revolve around the center point of the feeding pipe 11. As the crushing rollers 14 revolve, the third gear 15 fixedly sleeved on the lower side of the outer surface of the crushing rollers 14 will roll along the inner wall of the fourth gear 16. Under the transmission of the gear structure, the third gear 15 will rotate accordingly. The rotating third gear 15 can drive the crushing rollers 14 connected thereto to rotate. When all the crushing rollers 14 start to rotate, the printing wire 13 is transmitted downward through the feeding tray 20. The downward-moving printing wire 13 will contact the revolving and self-rotating crushing rollers 14, thereby being processed into powder. Processing the printing wire 13 into powder helps the material reach the melting temperature faster during the heating process, and the fine particles of the powder printing wire 13 can achieve a thinner layer thickness.

[0044] The printing wire material 13 processed into powder will enter the lower side of the heated feed pipe 11 under the action of gravity and be melted into liquid. A variety of melted printing wire materials 13 will respectively enter the corresponding printing nozzles 17, so that this efficient printing nozzle can use a variety of different raw materials to perform printing operations in a single printing operation. The above technical solution can melt the printing wire material 13 faster, thereby reducing the time required to melt the printing wire material 13. The fine powder particles of the printing wire material 13 can achieve a thinner layer thickness, thereby improving the accuracy and detail of the printed part, making the printed object surface smoother and more delicate, reducing the workload of post-processing, and the powder printing wire material 13 has better filling properties during the printing process, and can more fully fill the gaps in the printed layer, reducing material waste. At the same time, through a variety of different types of printing wire materials 13 and the corresponding printing nozzles 17, the device can use a variety of different types of printing wire materials 13 to perform printing operations in a single printing operation, which enables the melting printer housing 1 to meet more diverse printing needs and expand its application field.

[0045] Each printing nozzle 17 is provided with a support material recycling mechanism 2 fixedly mounted on the outer surface of the print head mounting housing 5 on one side. The support material recycling mechanism 2 includes a feeding pipe 202, a support material cutting hopper 203, an auger feed rod 206, a crushing rod 212, a plurality of cutting blades 213, and a synchronous transmission mechanism. The feeding pipe 202 is fixed to the lower end surface of the support material cutting hopper 203. The support material cutting hopper 203 communicates with the interior of the printing nozzle 17 through the feeding pipe 202. An auger feed rod 206 is located inside the feeding pipe 202.

[0046] The crushing rod 212 is located inside the supporting material cutting hopper 203, and multiple cutting knives 213 are fixedly sleeved on the outer surface of the crushing rod 212. The synchronous transmission mechanism can synchronously drive the crushing rod 212 to rotate while driving the auger feed rod 206 to rotate.

[0047] The synchronous transmission mechanism includes a heat-conducting shell 201, and a stepper motor 204 is fixedly installed on one side of the interior of the heat-conducting shell 201. The output shaft of the stepper motor 204 is connected to the transmission shaft 205 through a coupling, and the surface of the transmission shaft 205 facing the auger feed rod 206 is fixed to the auger feed rod 206; when the printing job is completed, the support frame used to support the printed part is removed and placed into the corresponding support material cutting hopper 203. Then, when the next printing job is performed, the stepper motor 204 is started, and the stepper motor 204 can drive the transmission shaft 205 connected thereto to rotate. The rotating transmission shaft 205 can drive the auger feed rod 206 fixed thereto to rotate. Since the feeding tube 202 located outside the auger feed rod 206 is directly connected to the printing nozzle 17, the position of the feeding tube 202 close to the printing nozzle 17 will also be heated.

[0048] The first bevel gear 207 is fixedly sleeved on one side of the outer surface of the transmission shaft 205, and the first bevel gear 207 is meshed with the second bevel gear 208. The axis of the second bevel gear 208 is connected to the bevel gear transmission shaft 209, and a third bevel gear 210 is fixedly sleeved on one side of the outer surface of the bevel gear transmission shaft 209. The third bevel gear 210 is meshed with a fourth bevel gear 211 fixedly sleeved on the lower side of the outer surface of the pulverizing rod 212; during the rotation of the transmission shaft 205, the first bevel gear 207 fixedly sleeved on the outer surface of the transmission shaft 205 and the second bevel gear 208 meshed therewith will rotate together. The rotating second bevel gear 208 can drive the bevel gear transmission shaft 209 connected to the axis of the second bevel gear 208 and the third bevel gear 210 fixedly sleeved on the outer surface of the bevel gear transmission shaft 209 to rotate, and the rotating third bevel gear 210 can drive the fourth bevel gear meshed therewith. The wheel 211 and the crushing rod 212 connected to the axis of the fourth bevel gear 211 rotate. When the crushing rod 212 rotates, the cutting knife 213 fixedly mounted on the outer surface of the crushing rod 212 will rotate therewith. The rotating cutting knife 213 can cut the support frame into particles. The particles will roll into the interior of the feeding tube 202 under the action of gravity and be heated into liquid inside the feeding tube 202. The liquid printing wire material 13 will be pushed into the interior of the corresponding printing nozzle 17 by the auger transfer rod 206 rotating inside the feeding tube 202, so as to be recycled. The above technical solution can recycle the support frame, thereby reducing material waste, improving material utilization, and reducing the demand for new raw materials and procurement costs. Enterprises using the melting printer shell 1 for production operations can complete more printing tasks without increasing additional material costs, thereby reducing the overall production cost of printed parts.

[0049] The outer surfaces of the top and bottom ends of the crushing rod 212 are each provided with a conical support sleeve 214 through a roller bearing sleeve. Both sides of the outer surface of the crushing rod 212 are fixedly connected to a support rod 215 fixed to the inner wall of the support material cutting hopper 203. The conical support sleeve 214 and the support rod 215 can support the crushing rod 212 to prevent it from tilting.

[0050] A sealing cover 216 is provided above the crushing rod 212 and is mounted on the upper side of the outer surface of the support material cutting hopper 203 through a threaded structure. The sealing cover 216 can prevent the particles from being thrown to the outside when the support frame is cut into particles.

[0051] A metal cover is provided on one side of the stepper motor 204 and is located on the outer surface of the heat-conducting housing 201. The stepper motor 204 and the metal cover are fixed to each other by screws. The metal cover protects the stepper motor 204 and can be removed for repair when a malfunction occurs in the stepper motor 204.

[0052] The synchronous rotation mechanism and the synchronous transmission mechanism mentioned above can respectively and simultaneously drive all the crushing rollers 14 and the auger transfer rod 206 and the cutting knife 213 to rotate. By driving multiple components to move by one driving force, it is possible to avoid configuring a separate driving device for each component, thereby reducing energy waste and reducing the production cost of the equipment. In addition, when a driving failure occurs in the support material recycling mechanism or the multi-material high-efficiency printing nozzle, since there is only one driving source, the driving failure can be quickly checked.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A fused deposition model 3D printer, characterized in that: The invention comprises a melt printer housing, wherein a print chamber is provided within the melt printer housing, wherein the interior of the print chamber is fixedly mounted to a movable bracket, wherein a multi-material high-efficiency print nozzle is fixedly mounted on one side of an outer surface of the movable bracket, wherein the multi-material high-efficiency print nozzle comprises a print head mounting housing, a heater, a plurality of feed pipes, a number of printing wires equal to the number of feed pipes, a number of print nozzles equal to the number of feed pipes, and a synchronous rotation mechanism, wherein the heater is fixedly mounted in the middle of the lower end surface of the print head mounting housing; The plurality of conveying pipes are installed in an arc shape inside the print head mounting housing, and the conveying pipes are connected to the print head mounting housing via a roller bearing; The plurality of printing nozzles are mounted in an arc shape on the outer side of the lower end surface of the print head mounting housing, the position of the feed pipe corresponds to the position of the printing nozzles, and the top end of the printing nozzle is located inside the feed pipe; The bottom ends of the plurality of printing strands are respectively located on the upper sides of the interiors of the plurality of feed tubes. The plurality of printing strands are of different types. A crushing roller installed inside the feed tube is provided on both sides below each of the printing strands. The synchronous rotation mechanism can synchronously drive all the crushing rollers to rotate. Each printing nozzle is provided with a support material recycling mechanism fixedly mounted on the outer surface of the print head mounting housing on one side, the support material recycling mechanism comprising a feeding pipe, a support material cutting hopper, an auger feed rod, a crushing rod, a plurality of cutting knives and a synchronous transmission mechanism, the feeding pipe being fixed to the lower end surface of the support material cutting hopper, the support material cutting hopper being in communication with the interior of the printing nozzle via the feeding pipe, and the auger feed rod being located inside the feeding pipe; The crushing rod is located inside the supporting material cutting hopper, and the plurality of cutting knives are fixedly sleeved on the outer surface of the crushing rod. The synchronous transmission mechanism can synchronously drive the crushing rod to rotate while driving the auger feeding rod to rotate.

2. The fused deposition modeling 3D printer according to claim 1, wherein: A control panel is fixedly mounted on one side of the outer surface of the melting printer housing, and the movable bracket, the multi-material high-efficiency printing nozzle and the support material recycling mechanism are all electrically connected to the control panel.

3. The fused deposition modeling 3D printer according to claim 1, wherein: The synchronous rotation mechanism includes a grinding motor. The outer side of the grinding motor is provided with a motor heat insulation shell fixed to the inside of the print head installation shell. The upper end surface of the motor heat insulation shell is provided with multiple through holes.

4. The fused deposition modeling 3D printer according to claim 3, wherein: The output shaft of the grinding motor is connected to the motor shaft through a coupling. The lower side of the outer surface of the motor shaft is fixedly sleeved on the first gear. The first gear is engaged with multiple second gears whose number is the same as the feed pipe, and the multiple second gears are respectively fixedly sleeved on the outer surfaces of multiple feed pipes.

5. The fused deposition modeling 3D printer according to claim 4, wherein: A fourth gear is provided above the second gear and is fixed to the inside of the print head mounting housing. A third gear is meshed on both sides of the inner wall of the fourth gear. The two third gears connected to both sides of the inner wall of the same fourth gear are respectively fixedly mounted on the lower sides of the outer surfaces of the two crushing rollers located inside the same feed pipe.

6. The fused deposition model 3D printer according to claim 5, wherein: The multi-material high-efficiency printing nozzle further includes a plurality of wire guide heads, the same number as the feed pipes, each of the plurality of wire guide heads being mounted at a middle position on the upper end surface of the plurality of feed pipes via a roller bearing, the inner wall of the wire guide head being in contact with the outer surface of the printing wire, and the wire guide head being slidably connected to the printing wire; A feeding tray mounted on the upper end surface of the melting printer housing is provided above the multi-material high-efficiency printing nozzle, and all the printing wire materials pass through the feeding tray.

7. The fused deposition model 3D printer according to claim 1, wherein: The synchronous transmission mechanism includes a heat-conducting shell, a stepper motor is fixedly installed on one side of the heat-conducting shell, the output shaft of the stepper motor is connected to the transmission shaft through a coupling, and the surface of the transmission shaft facing the auger feed rod is fixed between the auger feed rod.

8. The fused deposition modeling 3D printer according to claim 7, wherein: A first bevel gear is fixedly sleeved on one side of the outer surface of the transmission shaft, the first bevel gear is meshed with a second bevel gear, the axis of the second bevel gear is connected to the bevel gear transmission shaft, a third bevel gear is fixedly sleeved on one side of the outer surface of the bevel gear transmission shaft, the third bevel gear is meshed with a fourth bevel gear fixedly sleeved on the lower side of the outer surface of the pulverizing rod.

9. The fused deposition modeling 3D printer according to claim 8, wherein: The outer surfaces of the top and bottom ends of the crushing rod are each provided with a conical support sleeve through a roller bearing sleeve, and both sides of the outer surface of the crushing rod are fixedly connected with a support rod fixed to the inner wall of the supporting material cutting hopper; A sealing cover is provided above the crushing rod and is installed on the upper side of the outer surface of the support material cutting hopper through a threaded structure.

10. The fused deposition modeling 3D printer according to claim 7, wherein: A metal cover plate is provided on one side of the stepper motor and is located on the outer surface of the heat-conducting housing. The stepper motor and the metal cover plate are fixed by screws.

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