A 3D printing filament buffer mechanism and working method

Abstract

The present invention relates to the field of auxiliary application technology of 3D printers. The present invention proposes a 3D printing wire buffer mechanism, comprising a wire extrusion end and a 3D printing end, wherein a winding drum, a No. 1 extruder, a No. 1 guide tube, a No. 2 guide tube, a No. 2 extruder, a printing nozzle and a printing window are sequentially arranged from the wire extrusion end to the 3D printing end, and further comprising a wire buffer mechanism arranged between the No. 1 guide tube and the No. 2 guide tube, the whole of which is a closed arched structure formed by connecting a straight line portion and an arc portion end to end in sequence, the arc portion being directly above the straight line portion, one end of the straight line portion of the wire buffer mechanism is connected and communicated with the No. 1 guide tube, and the other end is connected and communicated with the No. 2 guide tube. At the same time, the present invention also designs a working method suitable for the designed mechanism of the present invention. The present invention designs a wire buffer mechanism that can accurately feed wire when the wire is not under tension or is under a small tension, solves defects such as printing pores, and improves the quality of the printed surface.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printer auxiliary applications, and in particular to a 3D printing filament buffer mechanism and a working method. Background Art

[0002] When using a 3D printer to print samples, the role of the extruder is to transport the filament from the take-up drum to the printing nozzle during the printing process to melt it and print layer by layer. Ideally, the extruder in the 3D printer will extrude a certain amount of filament according to the demand for the printing process. However, from the printing results, there will be printing holes. The reason for this limitation is that the traction provided by the extruder cannot overcome the gravity of the take-up drum part itself and the friction between the take-up drum and the fixed fulcrum during the wire feeding process, and cannot provide the required amount of filament to the printing nozzle in time, resulting in filament loss and the formation of defects such as printing holes. Summary of the Invention

[0003] In order to solve the problem in the above-mentioned prior art that 3D printing filaments may be missing during the printing process, forming defects such as printing pores.

[0004] The present invention proposes a 3D printing filament buffer mechanism. The present invention is achieved through the following technical solutions:

[0005] The present invention includes a filament extrusion end and a 3D printing end, wherein a winding drum, a No. 1 extruder, a No. 1 guide tube, a No. 2 guide tube, a No. 2 extruder, a printing nozzle and a printing window are sequentially arranged from the filament extrusion end to the 3D printing end. The present invention also includes a filament buffer mechanism arranged between the No. 1 guide tube and the No. 2 guide tube and capable of adjusting the filament extrusion amount of the No. 1 extruder. The filament buffer mechanism as a whole is a closed arch structure formed by sequentially connecting a straight line portion and an arc portion end to end. The arc portion is directly above the straight line portion, and one end of the straight line portion is connected to and communicated with the No. 1 guide tube, and the other end is connected to and communicated with the No. 2 guide tube. The operating speed of the No. 1 extruder is greater than the operating speed of the No. 2 extruder.

[0006] Furthermore, the wire buffer mechanism includes a wire inlet, a No. 1 limit switch, a No. 2 limit switch and a wire outlet, the wire inlet is connected to the No. 1 guide tube, and the wire outlet is connected to the No. 2 guide tube. The No. 1 limit switch is arranged on the arc part of the bow-shaped wire buffer mechanism and is electrically connected to the No. 1 extruder. When the wire touches the No. 1 limit switch, the extrusion amount of the No. 1 extruder is reduced; the No. 2 limit switch is arranged in the middle of the straight part of the bow-shaped wire buffer mechanism and is electrically connected to the No. 1 extruder. When the wire touches the No. 2 limit switch, the extrusion amount of the No. 1 extruder is increased.

[0007] Furthermore, the wire inlet has an inclination angle toward the arc portion of the wire buffer mechanism.

[0008] Furthermore, the No. 1 limit switch includes a first paddle switch, a square groove and a first pin. The paddle of the first paddle switch faces the inside of the bow-shaped wire buffer mechanism, and the paddle opening faces the wire outlet. The first paddle switch is fixed in the square groove by the first pin.

[0009] Furthermore, the second limit switch includes a second paddle switch, a support plate, a torsion spring, a support column and a third pin. The support column is arranged in the middle of the straight part of the wire buffer mechanism, the torsion spring is sleeved on the support column, the support plate is inclined on the torsion spring and the support plate faces the wire outlet, and the lower end of the support plate is hinged to the straight part of the wire buffer mechanism. The second paddle switch is fixed to the support plate by the third pin, the paddle of the second paddle switch faces the inside of the wire buffer mechanism, and the paddle opening faces the wire outlet.

[0010] Furthermore, the No. 2 limit switch also includes a connecting ring and a second pin. Two fixing ears are provided at the connecting part between the support plate and the wire buffer mechanism. A connecting ring is provided at the corresponding position of the wire buffer mechanism. The second pin passes through the fixing ears and the connecting ring to fix the support plate on the wire buffer mechanism.

[0011] Furthermore, the wire buffer mechanism is further provided with a connecting ear, and the connecting ear is connected to the 3D printer.

[0012] Furthermore, the wire buffer mechanism also includes a dehumidification mechanism, which includes a hinge, a gasket, a screw, a cover plate, a first magnetic strip and a second magnetic strip. The hinge is arranged on the side wall of the straight part of the wire buffer mechanism, and the cover plate is connected to the straight part of the wire buffer mechanism by screws. Magnetic strips are respectively arranged on the side wall where the arc part of the wire buffer mechanism is in contact with the cover plate and on the surface where the cover plate is in contact with the wire buffer mechanism. A gasket is also arranged between the hinge and the side wall of the straight part of the wire buffer mechanism, and a groove is opened at the position where the cover plate is connected to the hinge.

[0013] The present invention also provides a working method for the 3D printing filament buffer mechanism of the present invention, comprising the following steps:

[0014] S1. Start the 3D printer to work normally. The print head heats the filament normally and then prints layer by layer. The filament is continuously fed to the print head under the action of the extruder wheel of the second extruder according to the printing requirements.

[0015] S2. As the amount of wire in the wire buffer mechanism decreases, when the wire in the wire buffer mechanism touches the lower limit switch No. 2, the paddle on the limit switch No. 2 is subjected to pressure. This pressure is transmitted to the torsion spring through the limit switch No. 2 and the support plate, causing the torsion spring to bend downward. When the torsion spring begins to bend, the No. 1 extruder is triggered to start working, continuously conveying the wire from the take-up drum to the wire buffer mechanism;

[0016] S3: The filament is pushed into the filament inlet by the No. 1 extruder, and the curved filament that has touched the No. 2 limit switch in the filament buffer mechanism is lifted up again in the form of a curve. The filament is buffered in the filament buffer mechanism until it touches the highest point No. 1 limit switch. Then the No. 1 extruder stops working and waits for the No. 2 extruder to deliver it to the print head as required.

[0017] S4. When the filament delivered by the No. 2 extruder touches the No. 2 limit switch again in the filament buffer mechanism, the No. 1 extruder is triggered to start working again. This cycle repeats itself to achieve filament buffering and ensure a smooth printing process.

[0018] Furthermore, in step S3, the rotation speed of the No. 1 extruder is 150 r / min.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention designs a wire buffer mechanism that can accurately feed the wire when there is no tension on the wire or when it is subjected to a small tension, thereby solving defects such as printing voids and improving the printing surface quality.

[0021] 2. The present invention is equipped with two upper and lower limit switches. Through the adjustment of the two limit switches, the filament is dynamically stored in the filament buffer mechanism, ensuring that the filament will not be subjected to a large tension during the 3D printing process, thereby affecting the printing surface quality of the printed part.

[0022] Advantages and features of the present invention are illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention installed in a 3D printer.

[0024] Figure 2 This is an enlarged view of the buffer mechanism structure of the present invention.

[0025] Figure 3 This is a partial enlarged view of the No. 2 limit switch of the present invention.

[0026] Figure 4 Schematic diagram of the cover plate of the present invention.

[0027] Indicated in the figure:

[0028] 1. Winding drum; 2. Extruder No. 1; 3. Guide tube No. 1; 4. Filament buffer mechanism; 5. Guide tube No. 2; 6. Extruder No. 2; 7. Print head; 8. Print window; 41. Filament inlet; 42. Connecting ear; 43. Limit switch No. 1; 44. Limit switch No. 2; 45. Filament outlet; 46. Dehumidification mechanism; 431. First paddle switch; 432. Square groove; 433. First pin; 441. Second paddle switch; 442. Support plate; 443. Torsion spring; 444. Support column; 445. Connecting ring; 446. Second pin; 447. Third pin; 461. Hinge; 462. Gasket; 463. Screw; 464. Cover plate. DETAILED DESCRIPTION

[0029] The present application will be further described below with reference to the accompanying drawings and examples.

[0030] like Figure 1 and Figure 2As shown, the present invention provides a 3D printing filament buffer mechanism, comprising a filament extrusion end and a 3D printing end. From the filament extrusion end to the 3D printing end, a winding drum 1, a first extruder 2, a first guide tube 3, a filament buffer mechanism 4, a second guide tube 5, a second extruder 6, a print head 7, and a print window 8 are sequentially arranged. The filament buffer mechanism 4 is a closed arched structure formed by connecting a straight section and an arc section end to end. The arc section is directly above the straight section. One end of the straight section is connected to and communicates with the first guide tube 3, and the other end is connected to and communicates with the second guide tube 5. The filament buffer mechanism 4 can adjust the amount of filament extrusion, thereby enabling precise filament feeding with no tension or with minimal tension. The filament buffer mechanism 4 allows the filament to be dynamically stored in the filament buffer mechanism 4, ensuring that the filament is not subjected to a large tension during the 3D printing process, thereby affecting the print surface quality of the printed part. The wire buffer mechanism 4 includes a wire inlet 41 and a wire outlet 45. The wire inlet 41 is connected to the No. 1 guide tube 3, and the wire outlet 45 is connected to the No. 2 guide tube 5. The wire buffer mechanism 4 also includes a No. 1 limit switch 43 and a No. 2 limit switch 44. The No. 1 limit switch 43 is arranged in the arc portion of the bow-shaped wire buffer mechanism 4 and is electrically connected to the No. 1 extruder 2. It is used to reduce the extrusion amount of the No. 1 extruder 2 when there is too much wire inside the buffer mechanism, that is, when the wire touches the No. 1 limit switch 43; the No. 2 limit switch 44 is arranged in the middle of the straight portion of the bow-shaped wire buffer mechanism 4 and is electrically connected to the No. 1 extruder 2. It is used to increase the extrusion amount of the No. 1 extruder 2 when there is too little wire inside the buffer mechanism, that is, when the wire touches the No. 2 limit switch 44. Preferably, the wire inlet 41 has an inclination angle toward the arc portion of the wire buffer mechanism 4, ensuring that during normal operation, the wire is located in the middle position between the first limit switch 43 and the second limit switch 44 in the wire buffer mechanism 4. Preferably, the inclination angle is 45°.

[0031] The first limit switch 43 includes a first paddle switch 431, a square groove 432, and a first pin 433. The square groove 432 is used to accommodate the first paddle switch 431, and the first pin 433 is used to secure the first paddle switch 431 within the square groove 432. The paddle of the first paddle switch 431 faces the interior of the bow-shaped wire buffer mechanism 4, and the paddle opening faces the wire outlet 45. This ensures that if there is too much wire inside the wire buffer mechanism 4, the wire will contact the first paddle switch 431, causing the switch paddle to close.

[0032] like Figure 2 and Figure 3As shown, the second limit switch 44 includes a second paddle switch 441, a support plate 442, a torsion spring 443, a support column 444, a connecting ring 445, a second pin 446, and a third pin 447. The support column 444 is arranged in the middle of the straight portion of the wire buffer mechanism 4 and is used to fix the torsion spring 443. The torsion spring 443 is sleeved on the support column 444. The support plate 442 leans against the torsion spring 443 and faces the wire outlet 45. The support plate 442 is hinged to the straight portion of the wire buffer mechanism 4 at its lower end. Preferably, two fixing ears are provided at the connection portion between the support plate 442 and the wire buffer mechanism 4, and a connecting ring 445 is provided at the corresponding position of the wire buffer mechanism 4. The second pin 446 passes through the fixing ears and the connecting ring 445 to fix the support plate 442 to the wire buffer mechanism 4. The second paddle switch 441 is fixed to the support plate 442 via a third pin 447. The paddle of the second paddle switch 441 faces the interior of the wire buffer mechanism 4, and the paddle opening faces the wire outlet 45. This ensures that when there is too little wire in the wire buffer mechanism 4, the wire contacts the second paddle switch 441, causing the switch paddle to close.

[0033] The first paddle switch 431 and the second paddle switch 441 are preferably travel limit micro switches.

[0034] The wire buffer mechanism 4 also has a connection ear 42 for connecting to a 3D printer. Preferably, the wire buffer mechanism 4 can be connected to the 3D printer by bolts and nuts, with the bolts passing through the connection ear 42 and engaging with the nuts to fix the wire buffer mechanism 4 to the outer wall of the 3D printer.

[0035] like Figure 1 and Figure 4As shown, the wire buffer mechanism 4 also includes a dehumidification mechanism 46. The dehumidification mechanism 46 includes a hinge 461, a gasket 462, a screw 463, a cover 464, a first magnetic strip 465, and a second magnetic strip 466. The hinge 461 is set on the side wall of the straight portion of the wire buffer mechanism 4, and the cover 464 is connected to the straight portion of the wire buffer mechanism 4 by a screw 463. The cover 464 can rotate around the hinge 461, thereby realizing the opening and closing of the cover 464. In order to increase the closing effect of the cover 464, magnetic strips are respectively set on the side wall of the arc portion of the wire buffer mechanism 4 and the surface of the cover 464 and the wire buffer mechanism 4. Preferably, a gasket 462 can be provided between the hinge 461 and the side wall of the straight portion of the wire buffer mechanism 4, so that a certain distance is created between the main portion of the wire buffer mechanism 4 and the cover 464 to prevent interference when opening the cover 464, which makes it impossible to open the cover 464 normally. At the same time, a groove is provided at an appropriate position on the cover 464 to avoid the hinge 461 and prevent interference. The number of the dehumidification mechanisms 46 is determined according to the state in which the wire buffer mechanism 4 is installed in the 3D printer. If one side of the wire buffer mechanism 4 is in close contact with the outer wall of the 3D printer, the number of the dehumidification mechanisms 46 is one set; if the installation position of the wire buffer mechanism 4 does not contact the outer wall of the 3D printer, the number of the dehumidification mechanisms 46 is two sets, which are respectively provided on both sides of the wire buffer mechanism 4. The wire buffer mechanism 4 can not only resist water vapor in the environment and prevent water vapor from contaminating the wire, but also limit the wire along the wall thickness direction of the wire buffer mechanism 4, ensuring that the wire moves between the No. 1 limit switch 43 and the No. 2 limit switch 44 and does not move along the wall thickness direction of the wire buffer mechanism 4.

[0036] Specifically, the upper end of the No. 2 guide tube 5 is connected to the wire outlet 45 through a threaded hole, and the lower end is also connected to the No. 2 extruder 6 through a threaded hole. At the same time, the No. 2 wire tube 5 itself has a certain flexibility, and the wire can be smoothly transitioned from the wire outlet 45 to the No. 2 extruder 6.

[0037] Normal 3D printing speed usually depends on factors such as the size and complexity of the object, the material used, and the printer model. Generally speaking, on desktop 3D printers, the normal printing speed is usually 30mm / s to 100mm / s, and the maximum printing speed is between 60mm / s and 150mm / s. However, considering that increasing the printing speed may affect the printing quality, a lower printing speed will increase the printing time. Therefore, it is necessary to weigh the printing speed and printing quality. When printing simpler and rougher parts, a faster printing speed is selected, while more complex and delicate parts require a slower printing speed. Usually, Figure 1The print head 7 in the middle prints parts with a 0.4mm filament. Since the printing speed varies and the parts are rarely printed at the maximum printing speed during the printing process, the printing speed is calculated as 120mm / s. The general diameter of the filament used is 1.75mm. According to the constant volume of the filament, the formula (1) is used.

[0038] v1×(0.2) 2 ×π=v2×(1.75 / 2) 2 ×π (1)

[0039] where v1 is Figure 1 The printing speed of the print head 7 is v2. Figure 1 The pulling speed of the No. 2 extruder 6.

[0040] The calculation shows that v2≈6.2mm / s. According to the diameter of the extruder screw in the 3D printer is generally 1.75mm, the formula (2) is:

[0041] v=d×π×n (2)

[0042] Where v is the extruder linear speed, d is the screw diameter, and n is the extruder speed.

[0043] Substituting v2≈6.2mm / s and d=1.75mm into formula (2), we can obtain Figure 1 The speed of the No. 2 extruder 6 is

[0044] n2≈67.8r / min

[0045] Considering that it is necessary to ensure that the No. 1 extruder 2 is greater than or greater than a certain range of the No. 2 extruder 6, and that too high an extruder speed will aggravate the wear of parts, it is reasonable to set the No. 1 extruder 2 at 150r / min.

[0046] The present invention also provides a method for operating a 3D printing filament buffer mechanism, comprising the following steps: Before describing the operating steps, the buffer mechanism's pre-operation state is described. The filament moves from a take-up drum 1 through extruder 1, guide tube 1, filament buffer mechanism 4, guide tube 2, extruder 6, and print head 7. Within filament buffer mechanism 4, the filament is positioned between limit switch 1 43 and limit switch 2 44.

[0047] Step 1: Start the 3D printer to work normally. The print head 7 heats the filament normally and then prints layer by layer. The filament is continuously fed to the print head 7 under the action of the extrusion wheel of the second extruder 6 according to the printing requirements.

[0048] Step 2. As the amount of wire in the wire buffer mechanism 4 decreases, when the wire in the wire buffer mechanism 4 touches the No. 2 limit switch 44 below, the paddle on the No. 2 limit switch 44 will be subjected to pressure. The pressure is transmitted to the torsion spring 443 through the No. 2 limit switch 44 and the support plate 442. The torsion spring 443 will bend downward. When the torsion spring 443 begins to bend, the No. 1 extruder 2 is triggered to start working, and the wire is continuously transported from the winding drum 1 to the wire buffer mechanism 4, which plays a transitional role in timely replenishment of the wire, so that the wire itself does not bear the tension or bears a smaller tension, so that the No. 2 extruder 6 can accurately and correctly transport the wire to the printing nozzle 7.

[0049] Step 3, when the filament touches the paddle of the No. 2 limit switch 44, since the set filament supply speed of the No. 1 extruder 2 is greater than the filament consumption speed, and when it touches the No. 2 limit switch 44, the highest point of the filament is on the No. 2 limit switch 44, and the lowest point is at the wire inlet 41 and the wire outlet 45 at both ends, and the filament itself has a certain flexibility so that the filament is in the form of a curve. At this time, the filament will be pushed into the wire inlet 41 under the supply of the No. 1 extruder 2, and the curved filament that has touched the No. 2 limit switch 44 in the original filament buffer mechanism 4 will be lifted up again in the form of a curve, and the filament will be cached in the filament buffer mechanism 4 until it touches the highest point No. 1 limit switch 43. At this time, the No. 1 extruder 2 stops working, waiting for the No. 2 extruder 6 to deliver it to the printing nozzle 7 as required.

[0050] Step 4: When the filament delivered by the No. 2 extruder 6 touches the No. 2 limit switch 44 again in the filament buffer mechanism 4, the No. 1 extruder 2 is triggered again to start working. In this way, the cycle is repeated to achieve filament buffering and ensure the smoothness of the printing process.

[0051] In addition to the above embodiments, the present application may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the scope of protection required by this application.

Claims

1. A 3D printing filament buffer mechanism, comprising a filament extrusion end and a 3D printing end, wherein a winding drum (1), a No. 1 extruder (2), a No. 1 guide tube (3), a No. 2 guide tube (5), a No. 2 extruder (6), a printing nozzle (7) and a printing window (8) are sequentially arranged from the filament extrusion end to the 3D printing end, characterized in that: The wire buffer mechanism (4) is arranged between the No. 1 guide tube (3) and the No. 2 guide tube (5) and is capable of adjusting the wire extrusion amount of the No. 1 extruder (2). The wire buffer mechanism (4) is a closed arched structure formed by sequentially connecting a straight line portion and an arc portion end to end. The arc portion is directly above the straight line portion. One end of the straight line portion is connected to and communicates with the No. 1 guide tube (3), and the other end is connected to and communicates with the No. 2 guide tube (5). The operating speed of the No. 1 extruder (2) is greater than the operating speed of the No. 2 extruder (6). The wire buffer mechanism (4) includes a wire inlet (41), a No. 1 limit switch (43), a No. 2 limit switch (44) and a wire outlet (45), wherein the wire inlet (41) is connected to the No. 1 guide tube (3), and the wire outlet (45) is connected to the No. 2 guide tube (5). The No. 1 limit switch (43) is arranged at the arc portion of the bow-shaped wire buffer mechanism (4) and is electrically connected to the No. 1 extruder (2). When the wire touches the No. 1 limit switch (43), the extrusion amount of the No. 1 extruder (2) is reduced; the No. 2 limit switch (44) is arranged at the middle of the straight portion of the bow-shaped wire buffer mechanism (4) and is electrically connected to the No. 1 extruder (2). When the wire touches the No. 2 limit switch (44), the extrusion amount of the No. 1 extruder (2) is increased. The wire inlet (41) has an inclination angle toward the arc portion of the wire buffer mechanism (4).

2. The 3D printing filament buffer mechanism according to claim 1, characterized in that: The first limit switch (43) comprises a first paddle switch (431), a square groove (432) and a first pin (433); the paddle of the first paddle switch (431) faces the interior of the bow-shaped wire buffer mechanism (4), and the paddle opening faces the wire outlet (45); the first paddle switch (431) is fixed in the square groove (432) by the first pin (433).

3. The 3D printing filament buffer mechanism according to claim 2, characterized in that: The second limit switch (44) includes a second paddle switch (441), a support plate (442), a torsion spring (443), a support column (444) and a third pin (447), wherein the support column (444) is arranged in the middle of the straight portion of the wire buffer mechanism (4), the torsion spring (443) is sleeved on the support column (444), the support plate (442) leans against the torsion spring (443) and the support plate (442) faces the wire outlet (45), and the support plate (442) is hinged to the straight portion of the wire buffer mechanism (4) at its lower end, the second paddle switch (441) is fixed to the support plate (442) by the third pin (447), the paddle of the second paddle switch (441) faces the inside of the wire buffer mechanism (4), and the paddle opening faces the wire outlet (45).

4. The 3D printing filament buffer mechanism according to claim 3, characterized in that: The second limit switch (44) further comprises a connecting ring (445) and a second pin (446); two fixing ears are provided at the connection portion between the support plate (442) and the wire buffer mechanism (4); a connecting ring (445) is provided at a corresponding position of the wire buffer mechanism (4); and the second pin (446) passes through the fixing ears and the connecting ring (445) to fix the support plate (442) on the wire buffer mechanism (4).

5. The 3D printing filament buffer mechanism according to claim 1, characterized in that: The wire material buffer mechanism (4) is further provided with a connecting ear (42), and the connecting ear (42) is connected to the 3D printer.

6. The 3D printing filament buffer mechanism according to claim 1, characterized in that: The wire buffer mechanism (4) further comprises a dehumidification mechanism (46), and the dehumidification mechanism (46) comprises a hinge (461), a gasket (462), a screw (463), a cover plate (464), a first magnetic strip (465) and a second magnetic strip (466). The hinge (461) is arranged on the side wall of the straight portion of the wire buffer mechanism (4), and the cover plate (464) is connected to the straight portion of the wire buffer mechanism (4) by means of the screw (463). The magnetic strips are respectively arranged on the side wall where the arc portion of the wire buffer mechanism (4) and the cover plate (464) are in contact with each other, and on the surface where the cover plate (464) and the wire buffer mechanism (4) are in contact with each other. A gasket (462) is further arranged between the hinge (461) and the side wall of the straight portion of the wire buffer mechanism (4), and a groove is provided at the position where the cover plate (464) is connected to the hinge (461).

7. A method for operating the 3D printing filament buffer mechanism according to claim 3, characterized in that: The following steps are included: S1, start the 3D printer to work normally, the print head (7) heats the filament normally, and then prints layer by layer, and the filament is continuously fed to the print head (7) under the action of the extrusion wheel of the second extruder (6) according to the printing requirements; S2. As the amount of wire in the wire buffer mechanism (4) decreases, when the wire in the wire buffer mechanism (4) touches the lower limit switch No. 2 (44), the paddle on the limit switch No. 2 (44) is subjected to pressure, and the pressure is transmitted to the torsion spring (443) via the limit switch No. 2 (44) and the support plate (442), and the torsion spring (443) bends downward. When the torsion spring (443) begins to bend, the No. 1 extruder (2) is triggered to start working, and the wire is continuously transported from the winding drum (1) to the wire buffer mechanism (4); S3, the filament is pushed into the filament inlet (41) by the supply of the No. 1 extruder (2), and the curved filament that has touched the No. 2 limit switch (44) in the filament buffer mechanism (4) is lifted up again in the form of a curve. The filament is buffered in the filament buffer mechanism (4) until it touches the highest point No. 1 limit switch (43). The No. 1 extruder (2) stops working and waits for the No. 2 extruder (6) to deliver it to the printing nozzle (7) as required; S4. When the filament delivered by the No. 2 extruder (6) touches the No. 2 limit switch (44) again in the filament buffer mechanism (4), the No. 1 extruder (2) is triggered again to start working. In this way, the cycle repeats, achieving filament buffering and ensuring the smoothness of the printing process.

8. The working method of the 3D printing filament buffer mechanism according to claim 7, characterized in that: The operating speed of the No. 1 extruder (2) in step S2 is 150 r / min.

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