3D printing handheld device

Abstract

The utility model provides a 3D printing handheld device which comprises a wire feeding mechanism, the wire feeding mechanism comprises a wire feeding gear and a motor for driving the wire feeding gear, and the 3D printing handheld device is characterized by further comprising an auxiliary wire feeding mechanism; the auxiliary wire feeding mechanism comprises a friction wheel and a wire feeding channel, the friction wheel is adjacent to the wire feeding gear, the friction wheel is used for being matched with the wire feeding gear to enable wires to move, and an opening in one end of the wire feeding channel is adjacent to a gap between the wire feeding gear and the friction wheel; the number of the auxiliary wire feeding mechanisms is two, the two auxiliary wire feeding mechanisms are arranged on the two sides of the wire feeding gear correspondingly, and under driving of the wire feeding gear, the movement directions of wires in the two auxiliary wire feeding mechanisms are opposite. The 3D printing handheld device can effectively solve the technical problem that an existing 3D printing handheld device is provided with one material wire at a time, and the 3D printing handheld device is simple in structure, convenient to operate and capable of loading two material wires at a time.

Description

Technical Field

[0001] The utility model belongs to the technical field of 3D printing equipment, and particularly relates to a 3D printing handheld device. Background Art

[0002] Based on 3D printing technology, the 3D printing handheld device uses hot-melt PLA, ABS and other plastic filaments to extrude and draw to form the required 3D products, and is popular among children in particular.

[0003] However, currently, the 3D printing handheld devices on the market basically only support using one filament at a time. When drawing works of different colors, the filaments need to be frequently replaced. Although there are currently technical solutions for loading multiple filaments at one time, the driving structures involved in the solutions are complex and there are many components, making the formed 3D printing device too large and bulky to hold, and it is rather troublesome for troubleshooting and maintenance. Summary of the Utility Model

[0004] Aiming at the above deficiencies in the prior art, the utility model provides a 3D printing handheld device, which can effectively solve the technical problem of using only one filament in the existing 3D printing handheld device, and provides a 3D printing handheld device with a simple structure, convenient operation and capable of loading two filaments at one time.

[0005] To achieve the above object, the technical solution adopted by the utility model is: a 3D printing handheld device, including a wire feeding mechanism, the wire feeding mechanism includes a wire feeding gear and a motor for driving the wire feeding gear, and is characterized in that it further includes an auxiliary wire feeding mechanism;

[0006] The auxiliary wire feeding mechanism includes a friction wheel and a wire feeding channel. The friction wheel is arranged adjacent to the wire feeding gear. The friction wheel is used to cooperate with the wire feeding gear to move the filament. One end of the wire feeding channel is open and adjacent to the gap between the wire feeding gear and the friction wheel;

[0007] There are two groups of auxiliary wire feeding mechanisms, and the two groups of auxiliary wire feeding mechanisms are respectively arranged on both sides of the wire feeding gear. Driven by the wire feeding gear, the filaments in the two groups of auxiliary wire feeding mechanisms move in opposite directions.

[0008] The beneficial effects of adopting the above solution are as follows: In this solution, a single motor and a wire feeding gear are used to drive two wire materials simultaneously. The two wire materials are located on both sides of the wire feeding gear respectively. When the wire feeding gear rotates, one wire material advances into the wire feeding channel, and the other wire material moves in the opposite direction. Thus, when the wire feeding mechanism is connected to the heating and wire discharging part, if the motor rotates forward, one wire material enters the heating and wire discharging part through the corresponding wire feeding channel, while the other wire material moves in the opposite direction. However, when the motor rotates in reverse, the wire material that has entered the heating and wire discharging part retreats from the heating and wire discharging part back to the corresponding wire feeding channel, and the other wire material enters the heating and wire discharging part from the corresponding wire feeding channel under the drive of the wire feeding gear, that is, the switching of wire materials of different colors is completed.

[0009] This solution also includes a friction wheel that cooperates with the wire feeding gear to drive the wire material to move. The axial direction of the friction wheel is parallel to the axial direction of the wire feeding gear. The wire feeding gear and the friction wheel form a wire feeding gap, and the width of the wire feeding gap is slightly smaller than the diameter of the wire material. Once the wire material is inserted into the wire feeding gap formed between the wire feeding gear and the friction wheel, because the diameter of the wire material is slightly larger than the maximum distance or part of the distance between the wire feeding gear and the friction wheel, the rotating wire feeding gear will drive the friction wheel to rotate passively in the reverse direction through the wire material, thereby realizing the automatic wire feeding of the wire feeding line from the gap between the wire feeding gear and the friction wheel to the wire feeding channel and then to the heating and wire discharging part.

[0010] Furthermore, it also includes a heating and wire discharging part, which includes a feeding port, a heating element, and a discharging port. The other end of the wire feeding channel is communicated with the feeding port.

[0011] The beneficial effects of adopting the above solution are as follows: The heating and wire discharging part in this solution has the same structure and principle as the heating and wire discharging part of the existing 3D printing handheld device, including a feeding port, a heating element, and a discharging port. The other end of the wire feeding channel is communicated with the feeding port.

[0012] Furthermore, it also includes a strip-shaped housing with one end open. The wire feeding mechanism is arranged inside the housing, and the heating and wire discharging part is detachably connected to the open end of the housing.

[0013] The beneficial effects of adopting the above solution are as follows: The 3D printing handheld device in this solution includes a strip-shaped housing, which is similar to the housing of the existing 3D printing pen and can be fixedly connected by two parts or multiple parts through a bolt structure to facilitate the installation or maintenance of each part structure.

[0014] Furthermore, it also includes a conical wire guide. Both ends of the conical wire guide are open. The conical wire guide is arranged between the wire feeding channel and the feeding port. The larger opening end of the conical wire guide is communicated with the wire feeding channel, and the smaller opening end of the conical wire guide is communicated with the feeding port. The conical wire guide is detachably connected to the feeding port.

[0015] The beneficial effects of adopting the above solution are as follows: In this solution, in order to make the two wire feeding channels of the two groups of auxiliary wire feeding mechanisms more smoothly connected to the feeding port, a conical guide is provided between the wire feeding channel and the feeding port. The conical guide has openings at both ends. The larger opening end of the conical guide is connected to the two wire feeding channels. For example, the other ends of the two wire feeding channels both extend into the conical guide. The wire in the wire feeding channel enters from the largest opening end of the conical guide, and then under the action of the inner wall of the conical guide with gradually shrinking dimensions, the wire enters the feeding port connected thereto through the smaller opening end of the conical guide. This enables the wire in the two wire feeding channels to smoothly enter the feeding port when needed.

[0016] Further, auxiliary windows are respectively provided on both sides of the housing. The auxiliary windows are through holes opened on the housing. The connection line between the auxiliary window and the wire feeding gear is perpendicular to the movement direction of the wire. A flip cover that can be opened or closed is also provided. One side of the flip cover is rotatably connected to the housing, and the other side of the flip cover is snap-connected to the housing. The friction wheel is arranged on the flip cover;

[0017] An observation window is also provided on the housing. The observation window is made of a transparent material. Through the observation window, the junction of the other end of the wire feeding channel and the conical guide can be seen;

[0018] The wire feeding channel is made of a transparent material.

[0019] The beneficial effects of adopting the above solution are as follows: In this solution, in order to make the wire feeding and wire retracting time shorter and the wire feeding and wire retracting smoother, an auxiliary window is provided on the housing, and a flip cover that can be opened or closed is provided. Then the friction wheel is arranged on the inner side of the flip cover, that is, the side close to the inside of the housing. When the flip cover is opened, the friction wheel is separated from the wire feeding gear, and the wire can be directly manually pushed from the wire inlet hole into the inner end of the wire feeding channel without the drive of the wire feeding gear; when drawing is required, the flip cover on the side of the corresponding color wire is closed, and a gap slightly smaller than the diameter of the wire is formed between the friction wheel and the wire feeding gear. Then the corresponding wire is driven by the wire feeding gear to enter the discharge port from the inner end of the wire feeding channel. The flip cover on the side where the wire is not temporarily used remains open. Without the assistance of the friction wheel, the wire feeding gear cannot apply force to the wire, and the wire on the side not temporarily used remains stationary.

[0020] In this solution, an observation window is also provided on the housing. The observation window and the wire feeding channel are both made of transparent materials, so as to facilitate observing the advancement and retraction of the wire in the wire feeding channel through the observation window, and it is convenient for the user to select and switch the rotation direction of the wire feeding gear according to the advancement and retraction of the wire to drive the corresponding wire.

[0021] Further, wire guiding plates are respectively arranged at the upper end and the lower end of the friction wheel. The friction wheel is rotatably connected to the wire guiding plates. The lower end is the first wire guiding plate, and the upper end is the second wire guiding plate. One end of the wire guiding plate is fixedly connected to the flip cover. The width and length of the wire guiding plate are both larger than the diameter of the friction wheel. When the flip cover closes the auxiliary window, the edge of the wire feeding gear is embedded between the two wire guiding plates.

[0022] The beneficial effects of adopting the above solution are as follows: In this solution, in order to better match the wire feeding channel with the gap formed by the wire feeding gear and the friction wheel for wire feeding, a second wire guiding plate at the upper end and a first wire guiding plate at the lower end are respectively arranged along the length direction of the central axis of the friction wheel. The friction wheel is rotationally connected to one or two wire guiding plates. Since the width and length of the wire guiding plate are both greater than the diameter of the friction wheel, along the wire feeding direction, one end of the wire feeding channel is located between the upper and lower wire guiding plates, and perpendicular to the wire feeding direction, the edge of the wire feeding gear is located between the upper and lower wire guiding plates.

[0023] Further, two wire feeding holes and two front-end wire feeding channels are arranged at the other end of the housing. One end of the front-end wire feeding channel is communicated with the wire feeding hole, and the other end of the front-end wire feeding channel opens adjacent to the gap between the friction wheel and the wire feeding gear. The other end of the front-end wire feeding channel and one end of the wire feeding channel are both located on the first wire guiding plate. The front-end wire feeding channel and the wire feeding channel are respectively located at both ends of the gap between the friction wheel and the wire feeding gear.

[0024] The beneficial effects of adopting the above solution are as follows: In this solution, a wire feeding hole for feeding the wire into the housing is arranged on the housing, and in order to make the wire feeding process smoother, a front-end wire feeding channel is arranged between the wire feeding hole and the gap between the friction wheel and the wire feeding gear, so that the wire can enter the wire feeding hole and then smoothly enter the gap between the friction wheel and the wire feeding gear through the front-end wire feeding channel, and then enter the wire feeding channel.

[0025] In this application, the wire feeding direction mentioned is the direction from the wire feeding hole to the heating wire outlet part.

[0026] Further, a main gear and a driven gear are also arranged between the wire feeding gear and the motor. The main gear and the driven gear are vertically toothed by the driving of the main gear, and the wire feeding gear and the driven gear are connected by a rotating shaft.

[0027] The beneficial effects of adopting the above solution are as follows: In this solution, in order to protect the motor and reduce the maintenance cost of the gears, a main gear and a driven gear are also arranged between the wire feeding gear and the motor. The main gear is connected to the motor shaft, the motor directly drives the main gear, the main gear and the driven gear are toothed, the central axis of the main gear is perpendicular to the central axis of the driven gear, and the wire feeding gear and the driven gear are connected by a rotating shaft.

[0028] Further, a support column for supporting the wire feeding channel is also included. One end of the support column is fixedly connected to the bottom of the housing, and the other end is fork-shaped. One end of the wire feeding channel is embedded in the fork-shaped end.

[0029] It also includes a supporting device for supporting the wire-feeding gear and the driven gear. The supporting device is in the shape of an F, and includes a vertical rod and two horizontal plates. One end of the vertical rod is fixedly connected to the bottom of the housing, and one end of each of the two horizontal plates is detachably connected to the vertical plate. The two horizontal plates are respectively rotatably connected to the driven gear and the wire-feeding gear.

[0030] The beneficial effects of adopting the above solution are as follows: In this solution, in order to make each component more stable in the housing, a support column for supporting the wire-feeding channel is provided. One end of the support column is fixedly connected to the bottom of the housing, and the other end is fork-shaped. One end of the wire-feeding channel is embedded in the fork-shaped end so that the wire-feeding channel is stably supported.

[0031] A supporting device for supporting the wire-feeding gear and the driven gear is also provided. The supporting device is in the shape of an F, and includes a vertical rod and two horizontal plates. One end of the vertical rod is fixedly connected to the bottom of the housing, and one end of each of the two horizontal plates is respectively detachably connected to the vertical plate, so as to facilitate the installation of the wire-feeding gear and the driven gear. The two horizontal plates are respectively rotatably connected to the driven gear and the wire-feeding gear. In this way, it is not only convenient for the installation of the wire-feeding gear and the driven gear, but also enables the two gears to be stably supported.

[0032] Furthermore, it also includes a power supply device electrically connected to the motor, a button for controlling the rotation direction of the motor, and a circuit board respectively electrically connected to the motor, the heating wire-feeding part, and the button.

[0033] The beneficial effects of adopting the above solution are as follows: The other accessories required for the 3D printing handheld device in this solution to achieve the 3D printing function are the same as those of the 3D printing handheld device (3D printing pen) in the prior art. It also includes a power supply device, a button for controlling the rotation direction of the motor, a circuit board respectively electrically connected to the motor, the heating wire-feeding part, and the button, etc.

[0034] In conclusion, the beneficial effects of the present utility model are as follows:

[0035] 1. The 3D printing handheld device provided by the present utility model can load two wire filaments simultaneously in one device, enabling the user to draw more conveniently and quickly, and greatly reducing the frequency of replacing the wire filaments.

[0036] 2. The 3D printing handheld device provided by the present utility model has a simple structure and is convenient to use and maintain.

[0037] 3. The 3D printing handheld device provided by the present utility model can also improve the wire-feeding and wire-retracting efficiency through the improvement of the wire-feeding structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural diagram of the present utility model;

[0039] Figure 2 It is a schematic structural diagram of the wire-feeding mechanism of the present utility model;

[0040] Figure 3 Schematic connection diagram of the wire feeding gear, friction wheel and wire guiding plate;

[0041] Reference numerals: 1 - wire feeding gear, 12 - support device, 121 - vertical rod, 122 - horizontal plate, 2 - motor, 21 - main gear, 22 - driven gear, 3 - friction wheel, 4 - wire feeding channel, 41 - support column, 5 - heating wire outlet part, 6 - housing, 61 - auxiliary window, 62 - flip cover, 621 - first wire guiding plate, 622 - second wire guiding plate, 63 - observation window, 64 - wire feeding hole, 65 - front end wire feeding channel, 7 - conical feeder. Detailed implementation manners

[0042] The following further describes the detailed implementation manners of the present utility model in conjunction with the drawings:

[0043] In an embodiment of the present utility model, as Figures 1 - 3 shown, a 3D printing handheld device is provided, which includes a wire feeding mechanism. The wire feeding mechanism includes a wire feeding gear 1 and a motor 2 for driving the wire feeding gear 1, and is characterized in that it further includes an auxiliary wire feeding mechanism;

[0044] The auxiliary wire feeding mechanism includes a friction wheel 3 and a wire feeding channel 4. The friction wheel 3 is arranged adjacent to the wire feeding gear 1. The friction wheel 3 is used to cooperate with the wire feeding gear 1 to move the wire material. One end of the wire feeding channel 4 is open and adjacent to the gap between the wire feeding gear 1 and the friction wheel 3;

[0045] Two groups of auxiliary wire feeding mechanisms are provided. The two groups of auxiliary wire feeding mechanisms are respectively arranged on both sides of the wire feeding gear 1. Driven by the wire feeding gear 1, the wire materials in the two groups of auxiliary wire feeding mechanisms move in opposite directions.

[0046] Optimally, it further includes a heating wire outlet part 5. The heating wire outlet part 5 includes a feed inlet, a heating element, and a discharge outlet. The other end of the wire feeding channel 4 is communicated with the feed inlet.

[0047] Optimally, it further includes a strip-shaped housing 6. One end of the housing 6 is open. The wire feeding mechanism is arranged inside the housing 6. The heating wire outlet part 5 is detachably connected to the open end of the housing 6.

[0048] Optimally, it further includes a conical feeder 7. Both ends of the conical feeder 7 are open. The conical feeder 7 is arranged between the wire feeding channel 4 and the feed inlet. The larger opening end of the conical feeder 7 is communicated with the wire feeding channel 4, and the smaller opening end of the conical feeder 7 is communicated with the feed inlet. The conical feeder 7 is detachably connected to the feed inlet.

[0049] Preferably, auxiliary windows 61 are respectively arranged on both sides of the housing 6. The auxiliary windows 61 are through holes opened on the housing 6. The connection line between the auxiliary windows 61 and the wire feeding gear 1 is perpendicular to the movement direction of the wire material. A flip cover 62 for opening or closing the auxiliary windows 61 is also provided. One side of the flip cover 62 is rotatably connected to the housing 6, and the other side of the flip cover 62 is snap-connected to the housing 6. The friction wheel 3 is arranged on the flip cover 62;

[0050] An observation window 63 is further arranged on the housing 6. The observation window 63 is made of a transparent material. Through the observation window 63, the joint of the other end of the wire feeding channel 4 and the conical feeder 7 can be seen;

[0051] The wire feeding channel 4 is made of a transparent material.

[0052] Preferably, wire guiding plates are respectively arranged at the upper and lower ends of the friction wheel 3. The friction wheel 3 is rotatably connected to the wire guiding plates. The lower end is the first wire guiding plate 621, and the upper end is the second wire guiding plate 622. One end of the wire guiding plate is fixedly connected to the flip cover 62. The width and length of the wire guiding plate are both greater than the diameter of the friction wheel 3. When the flip cover 62 closes the auxiliary window 61, the edge of the wire feeding gear 1 is embedded between the two wire guiding plates.

[0053] Preferably, two wire feeding holes 64 and two front-end wire feeding channels 65 are arranged at the other end of the housing 6. One end of the front-end wire feeding channel 65 is communicated with the wire feeding hole 64. The other end of the front-end wire feeding channel 65 is opened adjacent to the gap between the friction wheel 3 and the wire feeding gear 1. The end of the other end of the front-end wire feeding channel 65 and the end of one end of the wire feeding channel 4 are both located on the first wire guiding plate 621. The front-end wire feeding channel 65 and the wire feeding channel 4 are respectively located at both ends of the gap between the friction wheel 3 and the wire feeding gear 1.

[0054] Preferably, a main gear 21 and a driven gear 22 are further arranged between the wire feeding gear 1 and the motor 2. The main gear 21 and the driven gear 22 are vertically meshed by the driving of the main gear 21. The wire feeding gear 1 and the driven gear 22 are connected by a rotating shaft.

[0055] Preferably, a support column for supporting the wire feeding channel 4 is further included. One end of the support column 41 is fixedly connected to the bottom of the housing 6, and the other end is fork-shaped. One end of the wire feeding channel 4 is embedded in the fork-shaped end;

[0056] A support device 12 for supporting the wire feeding gear 1 and the driven gear 22 is further included. The support device 12 is in an F shape and includes a vertical rod 121 and two horizontal plates 122. One end of the vertical rod 121 is fixedly connected to the bottom of the housing 6. One ends of the two horizontal plates 122 are respectively detachably connected to the vertical plate. The two horizontal plates 122 are respectively rotatably connected to the driven gear 22 and the wire feeding gear 1.

[0057] Optimally, it further includes a power supply device electrically connected to the motor 2, a button for controlling the rotation direction of the motor 2, and a circuit board electrically connected to the motor 2, the heating wire feeding part 5, and the button respectively.

[0058] During use, first connect and install all components, then turn on the power supply, open the two flip covers 62 on the housing 6, and then insert the two wire materials needed through the two wire feeding holes 64 respectively, and enter the wire feeding channel 4 through the front-end wire feeding channel 65 and the wire feeding gear 1. Wait until the wire materials can be seen through the observation window 63. Then cover the flip cover 62 at the end of the wire material to be used, so that the friction wheel 3 on the flip cover forms a gap slightly smaller than the diameter of the wire material with the wire feeding gear 1. Then press the corresponding button according to the situation of the wire feeding gear 1 rotating forward (or reverse) where the wire material is located, so that the motor 2 drives the wire feeding gear 1, and with the assistance of the friction wheel 3, the wire material moves through the wire feeding channel 4, passes through the conical wire guide 7, enters the heating wire feeding part 5, is heated and melted, and then discharged for drawing.

[0059] When the color needs to be changed, first press the reverse (or forward) button until the wire material that has just entered the heating wire feeding part 5 is seen to return to the wire feeding channel 4 through the observation window 63. Then open the flip cover 62 on that side, cover the flip cover 62 on the opposite side, and then press the button to make the wire material enter the heating wire feeding part 5.

[0060] Although the specific embodiments and implementation manners of the present invention have been described in detail with reference to the accompanying drawings, it should not be construed as a limitation on the protection scope of the present invention. Within the scope described in the claims, various modifications and deformations that can be made by those skilled in the art without creative labor still fall within the protection scope of this patent.

Claims

1. A 3D printing handheld device, comprising a wire feeding mechanism, wherein the wire feeding mechanism comprises a wire feeding gear (1) and a motor (2) driving the wire feeding gear (1), characterized in that It also includes an auxiliary wire feeding mechanism; The auxiliary wire feeding mechanism comprises a friction wheel (3) and a wire feeding channel (4); the friction wheel (3) is arranged adjacent to the wire feeding gear (1); the friction wheel (3) is used to cooperate with the wire feeding gear (1) to move the wire; one end of the wire feeding channel (4) is opened adjacent to the gap between the wire feeding gear (1) and the friction wheel (3); The auxiliary wire feeding mechanism is provided with two groups, and the two groups of the auxiliary wire feeding mechanism are respectively arranged on both sides of the wire feeding gear (1). Under the drive of the wire feeding gear (1), the wire material in the two groups of the auxiliary wire feeding mechanism moves in opposite directions.

2. A 3D printing handheld device as claimed in claim 1, characterized in that It also comprises a heated wire outlet portion (5), the heated wire outlet portion (5) comprising a feed port, a heating element, and a discharge port, and the other end of the wire feed channel (4) is connected to the feed port.

3. A 3D printing handheld device as claimed in claim 2, characterized in that It also comprises a bar-shaped shell (6), one end of which is open, the wire feeding mechanism is arranged in the shell (6), and the heating wire outlet portion (5) is detachably connected to the open end of the shell (6).

4. A 3D printing handheld device as claimed in claim 3, characterized in that It also includes a conical material guide (7), the conical material guide (7) has openings at both ends, the conical material guide (7) is arranged between the wire feeding channel (4) and the feeding port, the larger opening end of the conical material guide (7) is connected to the wire feeding channel (4), and the smaller opening end of the conical material guide (7) is connected to the feeding port, and the conical material guide (7) is detachably connected to the feeding port.

5. A 3D printing handheld device as claimed in claim 3, characterized in that Auxiliary windows (61) are respectively provided on both sides of the shell (6), the auxiliary windows (61) are through holes opened on the shell (6), the connecting line between the auxiliary window (61) and the wire feeding gear (1) is perpendicular to the moving direction of the wire, and a flip cover (62) is also provided for opening or closing the auxiliary window (61), one side of the flip cover (62) is rotatably connected to the shell (6), and the other side of the flip cover (62) is snap-fitted to the shell (6), and the friction wheel (3) is arranged on the flip cover (62); The housing (6) is also provided with an observation window (63), the observation window (63) is made of a transparent material, and the junction between the other end of the wire feeding channel (4) and the conical material guide (7) can be seen through the observation window (63); The wire feeding channel (4) is made of a transparent material.

6. A 3D printing handheld device as claimed in claim 5, characterized in that The upper and lower ends of the friction wheel (3) are respectively provided with wire guide plates, and the friction wheel (3) is rotatably connected to the wire guide plates. The lower end is a first wire guide plate (621), and the upper end is a second wire guide plate (622). One end of the wire guide plate is fixedly connected to the flip cover (62). The width and length of the wire guide plate are both greater than the diameter of the friction wheel (3). When the flip cover (62) closes the auxiliary window (61), the edge of the wire feeding gear (1) is embedded between the two wire guide plates.

7. A 3D printing handheld device as claimed in claim 6, characterized in that The other end of the shell (6) is provided with two wire feeding holes (64) and two front wire feeding channels (65), one end of the front wire feeding channel (65) is connected to the wire feeding hole (64), and the other end of the front wire feeding channel (65) is opened adjacent to the gap between the friction wheel (3) and the wire feeding gear (1), the other end of the front wire feeding channel (65) and one end of the wire feeding channel (4) are both located on the first wire guide plate (621), and the front wire feeding channel (65) and the wire feeding channel (4) are respectively located at the two ends of the gap between the friction wheel (3) and the wire feeding gear (1).

8. A 3D printing handheld device as claimed in claim 3, characterized in that A main gear (21) and a driven gear (22) are also provided between the wire feeding gear (1) and the motor (2); the main gear (21) and the driven gear (22) are vertically toothed; the wire feeding gear (1) and the driven gear (22) are connected via a rotating shaft.

9. A 3D printing handheld device as claimed in claim 8, characterized in that It also includes a support column (41) for supporting the wire feeding channel (4), one end of the support column (41) is fixedly connected to the bottom of the shell (6), and the other end is a fork-shaped end, and one end of the wire feeding channel (4) is embedded in the fork-shaped end; It also includes a supporting device (12) for supporting the wire feeding gear (1) and the driven gear (22), the supporting device (12) is arranged in an F-shaped pattern, and includes a vertical rod (121) and two horizontal plates (122), one end of the vertical rod (121) is fixedly connected to the bottom of the shell (6), one end of the two horizontal plates (122) are respectively detachably connected to the vertical rod (121), and the two horizontal plates (122) are respectively rotatably connected to the driven gear (22) and the wire feeding gear (1).

10. A 3D printing handheld device according to any one of claims 1 to 9, characterized in that It also includes a power supply device electrically connected to the motor (2), a key for controlling the rotation direction of the motor (2), and a circuit board electrically connected to the motor (2), the heating wire outlet portion (5), and the key respectively.

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