3D printing pen

Abstract

The utility model relates to a 3D (three-dimensional) printing pen, which adopts the design that a pen point is connected with a pen body through a detachable connecting device, when the pen point is damaged or abraded, only the pen point part instead of the whole printing pen needs to be replaced, and the maintenance cost is obviously reduced. In addition, different printing materials may require discharging heads of different specifications to achieve the optimal printing effect. According to the utility model, a user is allowed to conveniently replace the discharge heads with different specifications according to actual requirements, so that the use flexibility and the application range of the printing pen are improved. Moreover, the induction plate is arranged in the pen point and electrically connected with the activation position on the circuit board, and the control device can be triggered to start the material pumping device only after the pen point is correctly installed. By means of the design, the safety problems such as material leakage caused by wrong installation are effectively solved, and the safety of equipment and operators is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of 3D printing, in particular to a 3D printing pen. Background Art

[0002] With the development of three-dimensional (3D) printing technology, the demand for the ability to easily create customized objects is growing among both individual users and professionals. As an innovative tool, 3D printing pens allow users to draw three-dimensional structures through manual control, which greatly facilitates fields such as artistic creation, education, and prototyping. However, there are some limitations in existing 3D printing pen technology. Existing 3D printing pens often use a fixed pen head design, meaning that the pen head is a non-replaceable or adjustable part. This design leads to several key issues:

[0003] High maintenance costs: When the pen tip is worn or damaged, the user must replace the entire printer pen instead of just the damaged part.

[0004] Low flexibility: Different materials may require different nozzle sizes or shapes to achieve optimal printing results. Since the pen tip is not replaceable, users cannot choose the most suitable configuration based on their needs. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a 3D printing pen that can solve the problems of high maintenance cost and poor flexibility.

[0006] The utility model provides a 3D printing pen, which includes:

[0007] Pen body;

[0008] A circuit board is disposed in the pen body;

[0009] A pumping device is provided on the pen body;

[0010] a control device, disposed on the pen body and electrically connected to the circuit board;

[0011] The lead-out device includes a pen tip, a sensing plate and a discharge head, wherein the sensing plate and the discharge head are respectively arranged in the pen tip, and the discharge head is detachable and connected to the pumping device; and

[0012] A detachable connecting device is provided, wherein the pen tip is connected to the pen body via the detachable connecting device, so that the activation position of the sensing plate and the circuit board is electrically connected, thereby enabling the pumping device to pump the material to the discharge head when the control device is triggered.

[0013] Preferably, the detachable connection device includes a snap hole and a snap portion, one of the snap hole and the snap portion is provided on the pen body, and the other of the snap hole and the snap portion is provided on the pen tip;

[0014] The buckle portion is detachably clamped in the buckle hole.

[0015] Preferably, a plurality of plug-in plates are provided on the pen tip, and the buckle holes are provided on the plug-in plates.

[0016] Preferably, four said plug-in pieces are provided on the pen tip, wherein two opposite said plug-in pieces are each provided with a said snap hole, and the other two said plug-in pieces are each provided with a avoidance hole, and each said plug-in piece can be detachably plugged onto the pen body.

[0017] Preferably, the 3D printing pen further comprises a conducting device, and the conducting device comprises a conductive pin and a conductive sheet;

[0018] One of the conductive pin and the conductive sheet is disposed on the circuit board, and the other of the conductive pin and the conductive sheet is disposed on the sensing board;

[0019] The conductive pins are movably supported on the conductive sheet, so that the circuit board and the sensing board are electrically connected through the conductive pins and the conductive sheet.

[0020] Preferably, the derivation device also includes a base body, which is arranged on the pen tip, and two connecting columns and two connecting holes are provided on the base body. A plurality of fixing holes are opened on the induction plate, and each of the connecting columns is correspondingly inserted into one of the fixing holes, and each of the connecting holes is aligned with one of the fixing holes.

[0021] Preferably, the guide device further comprises a material guide pipe, one end of which is connected to the discharge head, and the other end of which is connected to the material pumping device.

[0022] Preferably, the pumping device includes a pumping motor, a pump body, a reduction gear set and two pumping gears, the pumping motor and the pump body are both arranged in the pen body, the reduction gear set and the two pumping gears are respectively arranged in the pump body, the pumping motor is drivingly connected to the reduction gear set, and the reduction gear set is drivingly connected to the two pumping gears;

[0023] A pumping hose is provided between the two pumping gears. When the two pumping gears rotate, the material is introduced through one end of the pumping hose and discharged through the other end.

[0024] Preferably, the control device includes a plurality of buttons and a plurality of control switches, each of the buttons is movably arranged on the pen body, each of the control switches is arranged on the circuit board, and each of the buttons is movably supported on each of the control switches in a one-to-one correspondence.

[0025] Preferably, the 3D printing pen further comprises a cover, and the cover is detachably mounted on the pen body.

[0026] The implementation of this utility model has the following beneficial effects:

[0027] The present utility model relates to a 3D printing pen, which is designed to connect the pen tip to the pen body by adopting a detachable connecting device. When the pen tip is damaged or worn, only the pen tip part needs to be replaced instead of the entire printing pen, which significantly reduces maintenance costs. Furthermore, different printing materials may require discharge heads of different specifications to achieve the best printing effect. The utility model allows users to easily replace discharge heads of different specifications according to actual needs, thereby improving the flexibility and applicability of the printing pen. In addition, the sensor plate is arranged in the pen tip and is electrically connected to the activation position on the circuit board. Only when the pen tip is correctly installed will the control device be triggered to start the pumping device. This design effectively prevents safety issues such as material leakage caused by incorrect installation, and ensures the safety of the equipment and operators. In addition, since the output device can be replaced separately, the overall scrapping due to failure of a single component is avoided, thereby indirectly extending the service life of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0029] Figure 1 This is a schematic diagram of the structure of a 3D printing pen in some embodiments of the present invention;

[0030] Figure 2 This is another structural schematic diagram of the 3D printing pen in some embodiments of the present invention;

[0031] Figure 3 is an exploded view of a 3D printing pen in some embodiments of the present invention;

[0032] Figure 4 is another exploded view of the 3D printing pen in some embodiments of the present invention;

[0033] Figure 5 This is an exploded view of a portion of the structure of a 3D printing pen in some embodiments of the present invention;

[0034] Figure 6 Schematic diagram of the internal structure of the 3D printing pen in some embodiments of the present invention. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present invention, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0036] It should be understood that although the terms "first", "second", "third", etc. may be used in the present invention to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0037] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," and the like should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] Figures 1 to 4 A 3D printing pen 10 in some embodiments of the present invention is shown. The 3D printing pen 10 includes a pen body 1, a circuit board 2, a pumping device 3, a control device 4, a guide device 5 and a detachable connecting device 6.

[0040] The pen body 1 is for the user to hold. The circuit board 2 is arranged in the pen body 1. The circuit board 2 plays a control role and is provided with corresponding control circuits and other required circuits. The pumping device 3 is arranged on the pen body 1 and is used to pump materials for 3D printing. The control device 4 is arranged on the pen body 1 and is electrically connected to the circuit board 2. The control device 4 is operated by the user, so that the user can control the operation of the 3D printing pen 10 through the control device 4. The output device 5 is connected to the pen body 1 via a detachable connecting device 6. The output device 5 is detachably connected to the pumping device 3; the output device 5 is used to output materials. The setting of the detachable connecting device 6 enables the output device 5 to be detachably connected to the pen body 1.

[0041] like Figures 4 to 6 As shown, the lead-out device 5 includes a writing head 51 , a sensing plate 52 and a discharging head 53 . The sensing plate 52 and the discharging head 53 are respectively arranged in the writing head 51 . The discharging head 53 is detachable and connected to the pumping device 3 .

[0042] The pen tip 51 is connected to the pen body 1 via the detachable connecting device 6 , so that the sensing plate 52 is electrically connected to the activation position of the circuit board 2 , thereby enabling the pumping device 3 to pump the material to the discharge head 53 when the control device 4 is triggered.

[0043] It can be understood that the pen body 1 is the part held by the user. A cavity is provided in the pen body 1 for accommodating the circuit board 2 and other internal components.

[0044] The circuit board 2 is used to process signals from the control device 4 and control the operation of the pumping device 3 accordingly. The circuit board 2 is provided with control circuits and other necessary electronic components, such as a microcontroller, a power management unit, etc., to ensure stable operation of the system.

[0045] The pumping device 3 is connected to a printing material reservoir (not shown). A control device 4, which can be a button, slide switch, or touchscreen interface, allows the user to start / stop the printing process and adjust parameters such as the material flow rate. The control device 4 is directly or indirectly electrically connected to the circuit board 2, thereby sending control instructions to other system components.

[0046] The pen tip 51, as the main part of the guide device 5, is fixed to the front end of the pen body 1 through a detachable connecting device 6. The induction plate 52 is arranged in the pen tip 51. When the pen tip 51 is correctly installed and combined with the pen body 1 through the detachable connecting device 6, the induction plate 52 will form an electrically conductive state with the activation position on the circuit board 2. This mechanism ensures that the entire printing system will only be activated when the pen tip 51 is correctly in place. The discharge head 53 is located in the pen tip 51, and the discharge head 53 is where the material finally flows out. The discharge head 53 is connected to the pumping device 3 in a detachable manner, so that the discharge head 53 can be easily replaced without destroying the overall structure to adapt to different types of printing materials or change the thickness of the lines.

[0047] like Figure 5 and Figure 6 As shown, in some embodiments of the 3D printing pen 10, the detachable connecting device 6 includes a snap hole 61 and a snap portion 62, one of the snap hole 61 and the snap portion 62 is set on the pen body, and the other of the snap hole 61 and the snap portion 62 is set on the pen tip 51; the snap portion 62 can be detachably fastened in the snap hole 61.

[0048] It is understood that the snap hole 61 can be located on the pen body 1 or the nib 51. If the snap hole 61 is located on the pen body 1, the snap portion 62 is correspondingly located on the nib 51; conversely, if the snap hole 61 is located on the nib 51, the snap portion 62 is located on the pen body 1. The snap hole 61 has a specific shape and size to fit tightly with the snap portion 62, ensuring that the two will not easily come loose when connected.

[0049] The outer contour of the latch portion 62 matches the latch hole 61 to ensure that the latch portion 62 can be fully inserted into the latch hole 61 when correctly aligned, thereby firmly securing the pen tip 51. The cooperation between the latch portion 62 and the latch hole 61 allows the user to easily install the pen tip 51 on the pen body 1 and quickly remove the pen tip 51 when needed.

[0050] like Figures 4 to 6 As shown, in some embodiments of the 3D printing pen 10 , a plurality of plug-in plates 511 are provided on the pen head 51 , and the buckle holes 61 are provided on the plug-in plates 511 .

[0051] As can be understood, the inserting piece 511 is a series of thin sheet-like structures located on the edge of the pen tip 51, and its placement on the pen tip 51 can be flexibly arranged. The design of the inserting piece 511 takes into account the matching of the corresponding slot or groove inside the pen body 1 to ensure that the pen tip 51 can be firmly inserted and fixed on the pen body 1.

[0052] The snap hole 61 is provided on the inserting plate 511. When the pen tip 51 is inserted into the pen body 1 through the inserting plate 511, the snap hole 61 aligns perfectly with the snap portion 62 on the pen body 1. This allows the user to snap the snap portion 62 into the snap hole 61 with a simple press, achieving a quick and reliable connection. This also allows the user to quickly replace the pen tip 51.

[0053] like Figures 4 to 6 As shown, in some embodiments of the 3D printing pen 10, four plug-in plates 511 are provided on the pen head 51, wherein two opposite plug-in plates 511 are each provided with a snap hole 61, and the other two plug-in plates 511 are each provided with a avoidance hole 512, and each plug-in plate 511 can be detachably inserted into the pen body 1.

[0054] Understandably, the four connecting pieces 511 can fix the pen tip 51 from different positions, ensuring the connection strength of the product. The avoidance hole 512 can correspondingly reduce the friction of the plug-in piece 511 during the plug-in installation process, ensuring the smooth disassembly and installation of the derivation device 5.

[0055] like Figure 6 As shown, in some embodiments of the 3D printing pen 10, the 3D printing pen 10 further includes a conducting device 8, which includes a conductive pin 81 and a conductive sheet 82, one of which is disposed on the circuit board 2, and the other of which is disposed on the sensing plate 52;

[0056] The conductive pins 81 are movably supported on the conductive sheet 82 , so that the circuit board 2 and the sensing board 52 are electrically connected via the conductive pins and the conductive sheet.

[0057] It is understood that the conductive pins 81 can be disposed on the circuit board 2 or on the sensing board 52. If the conductive pins 81 are disposed on the circuit board 2, the conductive pads 82 are correspondingly disposed on the sensing board 52; conversely, if the conductive pins 81 are disposed on the sensing board 52, the conductive pads 82 are correspondingly disposed on the circuit board 2. The conductive pins 81 are typically made of a metal material with good electrical conductivity, such as copper or gold, to ensure low resistance and high reliability.

[0058] The conductive sheet 82 is the part that mates with the conductive pin 81 and is also made of a material with good electrical conductivity. When the pen tip 51 is attached to the pen body 1 via the detachable connection device 6 (i.e., the snap hole 61 and the snap portion 62), the conductive pin 81 will move against the conductive sheet 82, thereby achieving electrical conduction between the circuit board 2 and the sensor board 52.

[0059] It should be noted that after the pen tip 51 is removed, the conductive pins 81 and the conductive sheets 82 will be offset from each other, thereby cutting off the connection between the circuit board 2 and the sensing board 52 .

[0060] like Figure 5 and Figure 6 As shown, in some embodiments of the 3D printing pen 10, the export device 5 also includes a base 54, which is arranged on the pen head 51. The base 54 is provided with two connecting columns 541 and two connecting holes 542. A plurality of fixing holes are opened on the sensing plate 52. Each connecting column 541 is correspondingly inserted into a fixing hole, and each connecting hole 542 is aligned with a fixing hole.

[0061] It can be understood that the base 54 is a supporting structure located inside the pen tip 51, which provides additional stability and positioning functions. The design of the base 54 takes into account a close fit with the inner cavity of the pen tip 51 to ensure its stability during use. A number of fixing holes 521 are provided on the sensor plate 52. These fixing holes correspond to the connecting posts 541 and the connecting holes 542 on the base 54, respectively. When the sensor plate 52 is installed on the base 54, each connecting post 541 is inserted into a corresponding fixing hole, and each connecting hole 542 is also aligned with a fixing hole, so as to ensure that the sensor plate 52 is accurately positioned and fixed on the base 54.

[0062] It should be noted that the sensor plate 52 and the base 54 are fixed together by passing bolts or other threaded connectors through the fixing holes 521 and being screwed into the connecting holes.

[0063] like Figure 5 and Figure 6 As shown, in some embodiments of the 3D printing pen 10, the guide device 5 further includes a material guide tube 55, one end of the material guide tube 55 is connected to the discharge head 53, and the other end of the material guide tube 55 is connected to the pumping device.

[0064] It is understood that the material guide tube 55 is a hollow pipe with one end connected to the discharge head 53 and the other end connected to the pumping device 3. The material guide tube 55 can be made of a high-temperature resistant, corrosion-resistant and flexible material, such as silicone or Teflon (PTFE), to accommodate different types of 3D printing materials.

[0065] like Figure 5 and Figure 6 As shown, in some embodiments of the 3D printing pen 10, the pumping device 3 includes a pumping motor 31, a pump body 32, a reduction gear set 33 and two pumping gears 34. The pumping motor 31 and the pump body 32 are both disposed in the pen body 1, and the reduction gear set 33 and the two pumping gears 34 are respectively disposed in the pump body 32. The pumping motor 31 is drivingly connected to the reduction gear set 33, and the reduction gear set 33 is drivingly connected to the two pumping gears 34.

[0066] A pumping hose is provided between the two pumping gears 34 , and when the two pumping gears 34 rotate, the material is introduced through one end of the pumping hose and discharged through the other end.

[0067] As will be understood, the pumping motor 31 is the power source of the pumping device 3 and is located within the pen body 1. The pumping motor 31 receives commands from the control device 4 via the circuit board 2 and starts or stops operation based on these commands. The pumping motor 31 can be a DC motor or a stepper motor, the specific choice depending on the required accuracy and control requirements. The pump body 32 is also a cavity located within the pen body 1, which houses the reduction gear set 33 and two pumping gears 34.

[0068] The reduction gear set 33, located within the pump body 32, converts the high-speed rotation of the pumping motor 31 into a lower-speed, higher-torque rotation. This reduction process helps improve pumping stability and accuracy. The reduction gear set 33 typically consists of multiple gears, each of which transmits power through meshing teeth.

[0069] Two pumping gears 34 are also provided in the pump body 32, and these two gears are driven by the reduction gear set 33. A pumping hose (not shown) is provided between the pumping gears 34. When the pumping gears 34 rotate, they squeeze the pumping hose, thereby pushing the material into one end of the hose and out through the other end.

[0070] It should be noted that the reduction gear set 33 and the pump gear 34 can be driven by a connecting shaft passing through the center of the gears, or by meshing.

[0071] like Figure 1 、 Figure 2 and Figure 6 As shown, in some embodiments of the 3D printing pen 10, the control device 4 includes a plurality of buttons 41 and a plurality of control switches 42. Each button 41 is movably provided on the pen body 1, and each control switch 42 is provided on the circuit board 2. Each button 41 movably supports each control switch 42 in a one-to-one corresponding manner.

[0072] It is understandable that the buttons 41 are provided on the pen body 1 and are the part that the user can directly operate. These buttons 41 can be used to start / stop printing, adjust the material outflow speed, select different printing modes and other functions.

[0073] Control switches 42 are located on the circuit board 2, with each button 41 corresponding to a corresponding control switch 42. When a user presses a button 41, it abuts against the corresponding control switch 42, triggering a control signal. These control switches 42 can be micro switches, contact switches, or other types of electronic switches, depending on the required response speed and reliability.

[0074] like Figures 1 to 4 as well as Figure 6As shown, in some embodiments of the 3D printing pen 10 , the 3D printing pen 10 further includes a cover 7 , which is detachably covered on the pen body 1 .

[0075] As can be understood, the cover 7 can effectively prevent dust, dirt, and other external impurities from entering the interior of the pen body 1, thereby extending the service life of the 3D printing pen and maintaining its stable performance. Since the cover 7 is detachable, the user can easily open the cover 7 to clean, inspect, or replace internal components, such as the pumping device 3, circuit board 2, etc.

[0076] The implementation of this utility model has the following beneficial effects:

[0077] The present utility model relates to a 3D printing pen, which is designed to connect the pen tip to the pen body by adopting a detachable connecting device. When the pen tip is damaged or worn, only the pen tip part needs to be replaced instead of the entire printing pen, which significantly reduces maintenance costs. Furthermore, different printing materials may require discharge heads of different specifications to achieve the best printing effect. The utility model allows users to easily replace discharge heads of different specifications according to actual needs, thereby improving the flexibility and applicability of the printing pen. In addition, the sensor plate is arranged in the pen tip and is electrically connected to the activation position on the circuit board. Only when the pen tip is correctly installed will the control device be triggered to start the pumping device. This design effectively prevents safety issues such as material leakage caused by incorrect installation, and ensures the safety of the equipment and operators. In addition, since the output device can be replaced separately, the situation where the entire device is scrapped due to the failure of a single component is avoided, thereby indirectly extending the service life of the entire machine.

[0078] The scheme of the present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have their own emphases. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the description are not necessarily required for the present invention. In addition, it can be understood that the steps in the method of the embodiment of the present invention can be adjusted in sequence, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present invention can be merged, divided and deleted according to actual needs.

[0079] While various embodiments of the present invention have been described above, the above descriptions are illustrative and non-exhaustive, and are not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to existing technologies, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A 3D printing pen, characterized in that: include: Pen body; A circuit board is disposed in the pen body; A pumping device is provided on the pen body; a control device, disposed on the pen body and electrically connected to the circuit board; The lead-out device includes a pen tip, a sensing plate and a discharge head, wherein the sensing plate and the discharge head are respectively arranged in the pen tip, and the discharge head is detachable and connected to the pumping device; and A detachable connecting device is provided, wherein the pen tip is connected to the pen body via the detachable connecting device, so that the activation position of the sensing plate and the circuit board is electrically connected, thereby enabling the pumping device to pump the material to the discharge head when the control device is triggered.

2. The 3D printing pen according to claim 1, characterized in that: The detachable connection device includes a buckle hole and a buckle portion, one of the buckle hole and the buckle portion is provided on the pen body, and the other of the buckle hole and the buckle portion is provided on the pen tip; The buckle portion is detachably clamped in the buckle hole.

3. The 3D printing pen according to claim 2, characterized in that: The pen tip is provided with a plurality of plug-in plates, and the buckle holes are provided on the plug-in plates.

4. The 3D printing pen according to claim 3, characterized in that: The pen tip is provided with four plug-in pieces, wherein two opposite plug-in pieces are each provided with a buckle hole, and the other two plug-in pieces are each provided with a avoidance hole, and each plug-in piece can be detachably plugged into the pen body.

5. The 3D printing pen according to claim 1, characterized in that: The 3D printing pen further includes a conducting device, which includes a conductive pin and a conductive sheet; One of the conductive pin and the conductive sheet is disposed on the circuit board, and the other of the conductive pin and the conductive sheet is disposed on the sensing board; The conductive pins are movably supported on the conductive sheet, so that the circuit board and the sensing board are electrically connected through the conductive pins and the conductive sheet.

6. The 3D printing pen according to claim 1, characterized in that: The derivation device also includes a base body, which is arranged on the pen tip. Two connecting columns and two connecting holes are provided on the base body. A plurality of fixing holes are opened on the induction plate. Each of the connecting columns is correspondingly inserted into one of the fixing holes, and each of the connecting holes is aligned with one of the fixing holes.

7. The 3D printing pen according to claim 1, characterized in that: The derivation device further comprises a material guide pipe, one end of which is connected to the material discharge head, and the other end of which is connected to the material pumping device.

8. The 3D printing pen according to claim 1, characterized in that: The pumping device includes a pumping motor, a pump body, a reduction gear set and two pumping gears. The pumping motor and the pump body are both arranged in the pen body. The reduction gear set and the two pumping gears are respectively arranged in the pump body. The pumping motor is driven and connected to the reduction gear set, and the reduction gear set is driven and connected to the two pumping gears. A pumping hose is provided between the two pumping gears. When the two pumping gears rotate, the material is introduced through one end of the pumping hose and discharged through the other end.

9. The 3D printing pen according to claim 1, characterized in that: The control device includes a plurality of buttons and a plurality of control switches. Each of the buttons is movably arranged on the pen body, and each of the control switches is arranged on the circuit board. Each of the buttons is movably supported on each of the control switches in a one-to-one corresponding manner.

10. The 3D printing pen according to claim 1, characterized in that: The 3D printing pen further comprises a cover, which is detachably mounted on the pen body.

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