CN107009614B - Printing method of 3D product and 3D printer used in method - Google Patents

Abstract

The invention discloses a printing method of a 3D product, a 3D printer used in the method and a printing head in the 3D printer. The printing method of the 3D product comprises the steps of spraying material layers layer by layer through a printing head of a 3D printer, after spraying of each material layer is finished, carrying out illumination curing on a designated area on each layer of printing material layer through a curing light head arranged on the printing head, dissolving all uncured areas of the material layers through a solvent through continuous superposition, and obtaining the remaining cured object which is the required 3D product. The 3D printing product of the invention utilizes the fluidity of the gel resin, so that heating setting is not needed, and raw materials are not needed to be heated and melted. Meanwhile, in order to overcome the flowability of the raw materials, a frame body for printing is additionally arranged, and the raw materials are limited, so that the accurate height value of the invention is ensured when each layer of material is sprayed. Compared with the traditional printing mode of the hot melt adhesive, the printing method of the hot melt adhesive is lower in manufacturing cost and higher in precision.

Description

A printing method of 3D products and a 3D printer used in the method

Technical field:

The present invention relates to the technical field of a three-dimensional product manufacturing method and its equipment, in particular to a 3D product printing method, a 3D printer used in the method, and a print head in the 3D printer.

Background technique:

3D printers have developed rapidly in the past few years. The existing 3D printers first need to use a computer to model before working, and then perform layered "slicing" of the built 3D model, and then "print" layer by layer from bottom to top. ” Each layer is sliced, resulting in a 3D product identical to the model built. According to this principle, the current 3D printing technology mainly includes the following two types, SLA stereolithography and hot-melt material spraying printing. The two 3D printing technologies will be introduced below.

The principle of making 3D products by stereolithography is, first, design a three-dimensional solid model through CAD, use discrete programs to slice the model, design the scanning path, and the generated data will accurately control the movement of the laser scanner and the lifting table; Secondly, the laser beam passes through the scanner controlled by the numerical control device, and irradiates the surface of the liquid photosensitive resin according to the designed scanning path, so that after a layer of resin in a specific area of the surface is cured, a cross section of the part is generated when one layer is processed; Then, the lifting table is lowered for a certain distance, the solidified layer is covered with another layer of liquid resin, and then the second layer of scanning is performed, and the second solidified layer is firmly bonded to the previous solidified layer, so that the three-dimensional workpiece prototype is formed by superimposing layers. , Finally, after the prototype is taken out of the resin, the final curing is carried out, and then the required product can be obtained through polishing, electroplating, painting or coloring. SLA technology is mainly used to manufacture a variety of molds, models, etc.; it can also be added to the raw materials by adding other components to replace the wax mold in the investment casting precision casting with the SLA prototype. SLA technology has faster forming speed and higher precision, but due to shrinkage during resin curing, it will inevitably generate stress or cause deformation. Therefore, it is the development trend to develop photosensitive materials with small shrinkage, fast curing and high strength.

The principle of another hot-melt material spraying and printing textile is similar to that of traditional inkjet printers, the difference is that the "ink" used in this 3D printer is a hot-melt material, such as hot-melt wax, hot-melt adhesive . The molten hot-melt material is sprayed on the printing platform by the printing mechanism, and "printing" is performed layer by layer. When the hot-melt material is sprayed out, it will solidify rapidly. After continuous "printing" layer by layer, the required three-dimensional object is finally formed. This kind of 3D printing technology is relatively simple in production process, and with the development of 3D robotic arm, the technology has matured, but its production accuracy is limited by factors such as materials, and the precision is difficult to reach the industrial level, and it can only produce small volume small product. For example, the raw material of this printer is usually solid, so a heating device must be provided in the print head to heat the raw material into a molten state, and then the molten raw material is extruded from the nozzle of the print head by an extrusion mechanism. It not only requires precise control of the heating temperature of the heating device to ensure smooth extrusion of raw materials. Simultaneously, when controlling the extruded amount of raw materials, it is also difficult to control the solid raw materials. For example, currently used printing materials are made into glue lines, and the feeding amount of the glue lines is controlled by gears or rollers, so as to calculate the outflow of materials from the nozzles of the print head. However, this method itself will cause a large error. The wear of the feeding gear, the accuracy of the rubber strip itself, and the traction force of the printing head on the glue line in the moving mode will all cause errors. This also leads to the situation that the accuracy of the current hot melt adhesive printing method is generally not high.

The inventor has been devoting himself to the technical development of 3D printers, and combining the advantages of the above two 3D printing technologies, proposes the following technical solutions.

Invention content:

The first technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a printing method for 3D products. This method combines the advantages of stereolithography and hot-melt material spraying and printing, and proposes a new manufacturing method for 3D products. This method not only has high precision, but also has low manufacturing cost.

The second technical problem to be solved by the present invention is to provide a 3D printer that can be used in the above-mentioned printing method of 3D products.

In order to solve the above-mentioned first technical problem, the present invention adopts the following technical scheme: the printing method of the 3D product is to spray material layers layer by layer through the printing head of the 3D printer, and after each layer of material layer is sprayed, print The curing light head set on the head performs light curing on the designated area on each layer of printing material layer, after continuous superimposition, finally dissolves the uncured area of all material layers through solvent, and the remaining cured object is the required 3D product .

Further, in the above technical solution, the method includes the following steps: the first step is to spray the first layer of material layer on the printing platform of the printer through the printing head of the 3D printer; the second step is to use the printing head of the 3D printer to automatically The light generated by the curing light head of the belt is used to illuminate and cure the area where the corresponding 3D product is located in the first layer of material layer, forming the first layer cut surface of the printed 3D product; the third step is to repeat the first and second steps continuously, Complete the superposition of subsequent material layers, and solidify each layer of the corresponding 3D product layer by layer, and finally complete all the sectional surfaces of the printed product, and all the sectional surfaces are cured into the 3D product by curing the light generated by the optical head; the above In the step, after the print head sprays the material layer each time, before performing light curing on the area where the corresponding 3D product is located in the material layer, a frame area is first cured on the material layer, and the frame area will The area where the above 3D product is located is surrounded, and finally a solidified frame is formed on the periphery of the 3D product; the fourth step is to dissolve the uncured area in the entire sprayed material layer with a solvent, and the remaining uncured The dissolved and solidified whole is the printed 3D product and frame.

Further, in the above technical solution, the printing raw material in this method is a gel-like photocurable resin, which is placed in a container and input into the print head through a pipeline, and the raw material is expelled by the raw material extrusion mechanism in the print head. Quantitative extrusion.

In order to solve the above-mentioned second technical problem, the present invention adopts the following technical solutions: the 3D printer includes: a printing head, a printing platform, and a container for providing printing materials for the printing head, and the printing head is suspended on the printing surface by a mechanical arm. Above the platform, and realize the movement in the X/Y/Z direction, the print head includes a nozzle and a curing light head located beside the nozzle, wherein the nozzle communicates with the container containing the raw material through a pipe, so The above-mentioned curing light head can generate light capable of curing the raw material.

Further, in the above technical solution, a raw material extruding mechanism is also arranged in the printing head, and the raw material extruding mechanism includes: a stepping motor and an extrusion head driven by the stepping motor, and the extruding head It acts on the pipe connected to the nozzle, and the extrusion head is driven by a stepping motor to extrude the raw material in the pipe from the nozzle.

Further, in the above technical solution, the container adopts a piston structure, the outlet of the container communicates with the nozzle through a pipe, and a piston is arranged on the container, and the piston is driven by a second stepping motor to drive the piston to move, and the Raw material extrusion.

Further, in the above technical solution, the piston is fixedly connected to a slider, the slider cooperates with the slider guide rod, the slider is linked with a threaded rod, and the second stepping motor drives the threaded rod to rotate, and the threaded rod rotates. When the rod rotates, it will produce up and down displacement, thereby driving the slider to move up and down along the slider guide rod matched with it, thereby driving the piston to run.

Further, in the above technical solution, the mechanical arm includes: three guide rods distributed in an equilateral triangle and vertically arranged, a slide seat is movably connected to each guide rod, and each slide seat is connected to a movable rod The upper ends are movably connected, and the lower ends of the three movable rods are respectively movably connected to a movable seat, and the three sliding seats are respectively linked with the corresponding motors through the traction lines, and the motors drive the linked sliding seats to slide up and down along the guide rods , so as to drive the three groups of movable rods to produce corresponding angle swings and height changes, and use the position changes of the movable rods to drive the movable seat to move in the X/Y/Z directions in the area surrounded by the three guide rods 41.

After the above-mentioned technical proposal of the present invention, since the present invention directly uses the gel-like raw material, there is no need to heat and melt the raw material, so there is no need to install a heating device in the print head, which reduces the cost of the product and simplifies the circuit control. At the same time, the use of gel-like raw materials can more accurately control the amount of raw materials, and further improve the accuracy of printed 3D products.

In addition, in order to ensure that the sprayed raw materials will not spread around due to gravity, when the area where the corresponding 3D product is located in the material layer is illuminated and cured, a frame area is simultaneously cured on the material layer. The body area surrounds the area where the 3D product is located. The raw material confined in the frame layer cannot spread around, thus ensuring the accuracy of the printed 3D product.

Finally, after the printing of the present invention is completed, the printed 3D product can be obtained directly by solvent cleaning, which is very convenient.

Description of drawings:

Fig. 1 is the structural representation of 3D printer among the present invention;

Fig. 2 is a perspective view of the printing head in Fig. 1;

Fig. 3 is a perspective view of the internal structure of the print head in Fig. 2;

Fig. 4 is the structural representation of container among Fig. 1;

Fig. 5 is a schematic diagram of the workflow of the present invention;

Fig. 6 is a schematic flow chart of finally obtaining 3D products in the present invention.

Detailed ways:

The present invention will be further described below in conjunction with specific embodiments and accompanying drawings.

As shown in Figures 1-4, this is a 3D printer in the present invention, which includes: a print head 1, a printing platform 2, and a container 3 that provides printing materials for the print head 1, and the print head 1 can pass through X The mechanical arm 4 moving in /Y/Z direction is suspended above the printing platform 2 .

The mechanical arm 4 used in the present invention is a delta robotic arm (Delta Robot), this mechanical arm generally has 3-4 degrees of freedom, can realize running on the X/Y/Z direction, and around the Z axis direction rotate. The triangular manipulator has been recorded in many patent documents as a maturely used technology. See the US patent documents with the patent announcement numbers US 8621953 B2, US20120103124 A1, US20120171383 A1, and 20130049261A1, all of which propose a related technical solutions. The mechanical arm adopted in the present invention is also proposed based on this principle, and this mechanical arm has the advantages of fast speed and high precision compared with general horizontally moving three-dimensional mechanical arms.

Specifically, the inventive mechanical arm 4 includes: three guide rods 41 arranged vertically in an equilateral triangle, a slide seat 42 is movably connected to each guide rod 41, each slide seat 42 is connected to a movable rod 43 upper end The lower ends of the three movable rods 43 are respectively movably connected to a movable seat 44, and the three sliding seats 42 are respectively linked with corresponding motors through traction lines, and the motors drive the linked sliding seats 42 along the guide rails. The rod 41 slides up and down, thereby driving the three sets of movable rods 43 to produce corresponding angle swings and height changes, and the position change of the movable rod 43 is used to drive the movable seat 44 to do X/Y/Z in the area surrounded by the three guide rods 41 direction of operation.

The print head 1 is installed on the movable seat 44, and the print head 4 is driven to run in the X/Y/Z direction by the movable seat 44.

Referring to FIGS. 2 and 3 , the print head 1 includes: a casing 10 and a nozzle 11 and a curing light head 12 fixed in the casing 10 . The nozzle 11 communicates with the container 3 through a pipe 13; the curing light head 12 is located beside the nozzle 11, and the curing light head 12 can generate light capable of curing printing materials. A raw material extruding mechanism is also arranged in the described printing head 1, and the raw material extruding mechanism includes a stepping motor 14 and an extruding head 15 driven by the stepping motor, and the extruding head 15 is used to connect with the nozzle 11. On the pipeline 13, the extrusion head 15 is driven by a stepping motor 14, and the raw material in the pipeline 13 is quantitatively extruded through the nozzle 11.

Different from the current 3D printers that use hot melt adhesive as raw material, the raw material in the present invention is gel raw material, so there is no need to install a heating mechanism in the print head 3, and the raw material can be directly input from the container 3 to the nozzle 11 through the pipeline 13 and discharged. In order to control the extrusion of raw materials, the present invention adopts an extrusion head 15, which can adopt a cam structure, and the extrusion head 15 is driven by a stepping motor 14 to rotate, and the downward extrusion force is generated on the pipeline 13, thereby The raw material in the pipeline 13 is extruded through the nozzle 11. Of course, the extrusion head 15 can also adopt other mechanisms, such as a roller structure and the like.

The curing light head 12 in the print head 1 is a light emitter, which produces a point light with a small diameter, and the curing light head 12 provides light for curing the gel resin. The curing optical head 12 among the present invention is similar to the laser head effect in the existing laser powder sintering technology, and difference is, in the laser powder sintering technology, the laser head acts as the generator of the high-temperature heat source to the flat powder layer. The set area is sintered row by row to complete the solidification of the powder material. In the present invention, the resin gel in the set area is cured by the light generated by the curing light head 12 . The diameter of the light produced by the curing light head 12 will have a direct impact on the precision of the 3D product produced, so products similar to laser emitters can be directly used, and then the light source can be changed to light for curing gel resin, such as ultraviolet Light, Blu-ray, etc. The light produced in this way is directly very fine, which can further improve the precision of the 3D products produced.

Referring to shown in 4, what the container 3 of the present invention adopted is a piston structure, the outlet 31 of the container 3 communicates with the nozzle 11 through the pipeline 13, the container 3 is provided with a piston 32, and the piston 32 is driven by a second stepping motor 33 to drive The piston 32 moves to squeeze out the raw material in the container 3 . The specific structure can adopt the following manner: the piston rod part of the piston 32 is fixedly connected on a slide block 34, and the slide block 34 cooperates with the guide rod 35. The slider 34 is linked with a threaded rod, and the second stepper motor 33 drives the threaded rod 36 to rotate. The threaded rod 36 will move up and down while rotating, thereby driving the slider 34 to move up and down along the guide rod 35 matched with it, thereby driving Piston 32 moves, and the gel raw material in container 3 is extruded.

The advantage of using this method is that the second stepper motor 33 can precisely control the rotation angle of the screw rod, thereby accurately controlling the displacement distance of the piston 32, so that the extruded amount of the raw material in the container 3 can be controlled, and the quantity can be realized according to the demand. Extrusion, ensuring the precision of the final formed 3D product.

Of course, both the stepper motor 14 and the second stepper motor 33 in the print head 1 of the present invention are controlled by a control circuit, so that the material can be precisely extruded through the nozzle 11 .

5 and 6, the printing method of the 3D product of the present invention is illustrated. In this method, the printing head of the 3D printer is used to spray material layers layer by layer, and after each layer of material layer is printed, the curing light set on the printing head The head performs light curing on the designated area on each printed material layer, after continuous superimposition, and finally dissolves the uncured area through the solvent, and the remaining cured object is the required 3D product.

Before printing 3D products, still according to the current 3D printing technology, modeling is carried out by computer, and the 3D products to be printed are processed in layers, and the cut surfaces of each layer are made layer by layer. The height H of each slice is preset, and the value of H is generally 0.05-0.5mm. The specific value depends on the precision of the 3D product produced. Usually, the more slices (the smaller the value of H, the better the 3D product produced will be). The higher the accuracy), and then continuously superimpose the cut surfaces from bottom to top to form the 3D product to be produced. The specific steps are as follows:

In the first step, the first material layer 51 is sprayed on the printing platform 2 of the printer by the printing head 1 of the 3D printer 100 . When the material is sprayed through the nozzle 11, it is not necessary to precisely control the position of the print head 1. Since the material used for printing is a gel-state resin, the material itself has a certain fluidity. As long as the area of the printing area is set, Then, since the height H of each layer of material is fixed, the total amount of raw materials required for each layer of material can be accurately calculated, so that the height of each layer of material can be precisely controlled by controlling the amount of raw material extruded from the container 3 . For example, it is assumed that the amount of raw materials used for each layer of material is V.

In the second step, after the spraying of the first layer of material layer 51 is completed, the nozzle 11 stops working and does not continue to spray the raw material. At this time, the curing light head 12 on the printing head starts to work, and it will emit light capable of curing the raw material. The print head 1 will move in the X/Y plane driven by the mechanical arm 4, and light-cure the area where the corresponding 3D product is located in the first layer of material layer 51, forming the first cut surface 61 of the printed 3D product , which is the lowest slice of the printed 3D product.

According to the above, since the raw material used for printing is resin in a gel state, this raw material itself has a certain fluidity. Although the fluidity of this material is limited, if it is not restricted, this raw material will still slowly Velocity diffuses around, so just will certainly cause the height of the sprayed first layer of material layer 51 to become smaller, if simultaneously along with the material layer of follow-up spraying constantly superimposed, this fluidity increases with the increase of gravity, will eventually As a result, an effective stack layer cannot be formed. Therefore, one of the biggest technical features of the present invention is the need to form a "container" that at least surrounds the area where the 3D product is located, so as to ensure that the sprayed raw materials will not spread around due to gravity. The scheme adopted by the present invention is: when the area where the corresponding 3D product is located in the material layer is illuminated and cured, a frame area is simultaneously cured on the material layer, and the frame area covers the area where the 3D product is located. area surrounded by. Combined with the first layer of material layer 51, when performing light curing on the area where the corresponding 3D product is located in the first layer of material layer 51, first a frame area should be cured in the peripheral area of the first layer of material layer 51, see Figure 5 shows. The first frame body layer 71 is cured by curing the optical head 12 in the area near the edge of the first material layer 51 . In this way, due to the existence of the first frame layer 71 , the raw materials confined in the first frame layer 71 cannot spread around, thereby ensuring the accuracy of the height of the cut surface 61 of the first layer.

In the third step, after the curing of the cut surface 61 of the first layer is completed, the curing optical head 12 stops working, and the nozzle 11 restarts to spray the second material layer 52 at this moment. The second layer of material layer 52 is exactly the same as the second layer of material layer, and overlaps, and the amount of material is also exactly the same. Similarly, after the second layer of material layer 52 is sprayed, the curing optical head 12 starts to work. First, in the second layer of material layer 52, the area above the first layer of frame body layer 71 is cured to form a second layer of frame body layer. 72,. Then, the area where the 3D product is located corresponding to the middle area is subjected to light curing to form the second cut surface 62 of the printed 3D product.

Then, according to the preset section model, this step is repeated continuously until the spraying of all material layers is completed, and the curing of all frame layers and product section layers is completed. Among them, the first frame layer, the second frame layer... are continuously superimposed and solidified to form a whole——frame 7 . The first layer cut surface 61, the second layer cut surface 62... are grounded and solidified continuously to form a whole——3D product 6.

At this time, the material layers outside the frame body 7 may have already collapsed due to the fluidity of the raw materials, so they spread severely to the surroundings, but the material layers inside the frame body 7 are still stacked layer by layer according to the preset requirements. Wherein the first layer cut surface 61 , the second layer cut surface 62 , and the topmost cut surface should be completely solidified to form a 3D product 6 . However, the uncured material in the frame body 7 is still in a gel state, or in a semi-cured state, and submerges the 3D product 6 . The next step is to separate the 3D product 6 from these gelatinous or semi-cured raw materials.

In the fourth step, put all the materials in the entire frame body 7 into the solvent, or directly flush the frame body 7 with the solvent. The uncured area of the material layer in the entire frame body 7 is dissolved by a solvent, and the remaining undissolved cured whole is the printed 3D product 6 .

Since the resin 7 used in the present invention is a photocurable resin, such as UV resin, the corresponding curing light head 12 can generate light capable of curing the printing material. After being irradiated by the UV light generated by the curing light head 12, physical and chemical changes can occur rapidly in a relatively short period of time, and then the cured oligomer can be cross-linked. Therefore, as long as relevant solvents are used, uncured raw materials can be dissolved, while cured raw materials cannot be dissolved by solvents, and finally a frame 7 for auxiliary printing and a final 3D product 6 are obtained.

To sum up, the device used in the present invention has a simple structure, and its printed 3D products utilize the fluidity of the gel-type resin itself, so there is no need to use heating settings, and there is no need to heat and melt the raw materials. At the same time, in order to overcome the fluidity of the raw material, a frame 7 is added for printing to limit the raw material, so as to ensure that the height value of the present invention is accurate when spraying each layer of material. The invention not only can produce three-dimensional products with high precision, but also has lower production cost and better precision than the traditional printing method of hot melt adhesive.

Of course, the above descriptions are only specific embodiments of the present invention, and are not intended to limit the implementation scope of the present invention. All equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent application of the present invention should be included in the The present invention is within the patent scope.

Claims (7)

1. A printing method for a 3D product, characterized in that: the method passes through the print head (1) of the 3D printer (100) to spray material layers layer by layer, and after each layer of material layer is sprayed, the print head (1) The curing light head (12) provided on the upper part performs light curing on the designated area on each layer of printing material layer, after continuous superimposition, finally dissolves the uncured area of all material layers through the solvent, and the remaining cured object is the required 3D product (6); The method includes the following steps: In the first step, the first layer of material layer (51) is sprayed on the printing platform (2) of the printer by the printing head (1) of the 3D printer (100); The second step is to use the light generated by the curing light head (12) on the print head (1) of the 3D printer (100) to light and cure the area where the corresponding 3D product is located in the first layer of material layer (51) , forming the first cut surface (61) of the printed 3D product; The third step is to repeat the first and second steps continuously to complete the superposition of subsequent material layers, and to solidify each layer of the 3D product (6) layer by layer, and finally complete all the cut surfaces of the printed product, and all the cut surfaces are cured The light produced by the optical head (12) is solidified into the 3D product (6); In the above steps, after the print head (1) sprays the material layer each time, before curing the area where the corresponding 3D product (6) is located in the material layer, first cure a frame area on the material layer , the frame area surrounds the area where the 3D product (6) is located, and finally a frame (7) solidified as a whole is formed on the periphery of the 3D product (6); In the fourth step, the uncured area in the sprayed entire material layer is dissolved by solvent, and the remaining undissolved cured whole is the printed 3D product (6) and frame (7). 2. The printing method of a 3D product according to claim 1, characterized in that: in this method, the printing material is a gel-like photocurable resin, which is placed in the container (3) and passed through the pipeline (13 ) is input into the print head (1), and the raw material is quantitatively extruded through the raw material extrusion mechanism in the print head (1). 3. The printing method of a 3D product according to claim 1 or 2, characterized in that: the 3D printer used in the printing method comprises: a printing head (1), a printing platform (2), and a printing head (1) A container (3) for printing raw materials is provided, the print head (1) is suspended above the printing platform (2) by a mechanical arm (4), and moves in the X/Y/Z direction, The print head (1) includes a nozzle (11) and a curing light head (12) positioned at the side of the nozzle (11), wherein the nozzle (11) is connected to a container ( 3) connected, the curing light head (12) can generate light capable of curing the raw material; A raw material extruding mechanism is also arranged in the described print head (1), and the raw material extruding mechanism includes: a stepper motor (14) and an extrusion head (15) driven by the stepper motor, and the extruder head (15) acts on the pipeline (13) connected with the nozzle (11), drives the extrusion head (15) by the stepping motor (14), and the raw material in the pipeline (13) is extruded by the nozzle (11). 4. The printing method of a 3D product according to claim 3, characterized in that: the container (3) adopts a piston structure, and the outlet (31) of the container (3) passes through the pipeline (13) and the nozzle (11) ), the container (3) is provided with a piston (32), and the piston (32) is driven by a second stepping motor (33) to drive the piston (32) to move, and the raw material in the container (3) is extruded. 5. The printing method of a kind of 3D product according to claim 4, is characterized in that: described piston (32) is fixedly connected on a slide block (34), and this slide block (34) and slide block guide rod (35) cooperates, slide block (34) is linked with threaded mandrel (36), and second stepper motor (33) drives this threaded mandrel (36) to rotate, and threaded mandrel (36) will produce up and down displacement while rotating, thereby Drive the slide block (34) to move up and down along the slide block guide rod (35) matched with it, thereby driving the piston (32) to run. 6. The printing method of a 3D product according to any one of claims 3-5, characterized in that: the mechanical arm (4) includes: three guide rods (41) arranged vertically in an equilateral triangle ), a sliding seat (42) is movably connected on each guide rod (41), each sliding seat (42) is movably connected with the upper end of a movable rod (43), and the lower ends of the three movable rods (43) are respectively The movable link is connected to a movable seat (44), and the three sliding seats (42) are linked with the corresponding motors respectively through the traction line, and the linked sliding seats (42) are driven up and down along the guide rod (41) by the motors. Sliding, thereby driving three sets of movable rods (43) to produce corresponding angle swings and height changes respectively, utilize the position change of the movable rods (43) to drive the movable seat (44) to move in the area surrounded by the three guide rods (41). Movement in X/Y/Z direction. 7. The printing method of a 3D product according to claim 1 or 2, characterized in that: the 3D printer used in the printing method comprises: a printing head (1), and the printing head (1) includes Nozzle (11), and the curing optical head (12) positioned at the side of the nozzle (11), wherein the nozzle (11) communicates with the container (3) of the light-curable resin raw material in the form of a gel through a pipeline (13) , the curing light head (12) can produce light that can cure the raw material; a raw material extruding mechanism is also arranged in the described printing head (1), and the raw material extruding mechanism includes a stepper motor (14) and Through the extrusion head (15) driven by the stepper motor, the extrusion head (15) acts on the pipeline (13) connected with the nozzle (11), and the extrusion head (15) is driven by the stepper motor (14). ), the raw material in the pipeline (13) has a nozzle (11) to quantitatively extrude.