60results about How to "Reduce printing costs" patented technology

The invention provides a three-dimensional printing method and device and a three-dimensional printing data processing method and device, and relates to the technical field of three-dimensional printing. The three-dimensional printing data processing method for digital light processing printing comprises the steps that three-dimensional data of an object to be printed are obtained, and the three-dimensional data comprise the positions of interfaces of different printing materials needed by the object to be printed; a diffusion structure is generated at the position of the interface, the diffusion structure is used for diffusing the printing material used later at the position of the printing interface in the diffusion structure, and the printing material corresponding to the diffusion structure is the printing material used first at the position of the printing interface; and generating three-dimensional printing data according to the three-dimensional data and the diffusion structure.

The invention relates to a device for realizing accurate patterning transfer of a microstructure through air pressure type vibration-assisted ultraviolet nano-imprinting, and belongs to the field of ultra-precision machining. The device comprises an outer closed compartment, a lifting platform, an xyz-axis displacement micro-motion platform, a vibration platform, an imprinting device, an ultraviolet light curing device, a substrate, a supporting frame, an air pressure device and a tray. An impressing film is fixed through a machine cover, an impressing device is installed in an outer closed compartment through a partition plate, a lifting platform and an xyz-axis displacement micro-motion platform are matched to control a substrate on a tray to be attached to the impressing device, an air pressure device can increase air pressure to provide impressing force to achieve impressing, and a vibration platform assists in impressing glue filling and demolding. And the ultraviolet light curing device is used for carrying out ultraviolet light irradiation curing, demolding is carried out after curing is completed, and microstructure transfer of the upper template of the imprinting film is completed. According to the device, patterning transfer of a large-area microstructure is achieved through gas imprinting, imprinting force is controlled through air pressure, imprinting efficiency, the filling rate and fidelity are improved, and damage to the imprinting device and a template is reduced.

A dual-mode biological 3D printing head assembly comprises a bottom plate, an in-place device, a UV curing lamp, a normal-temperature printing head and a thermal printing head are arranged on the bottom plate, and the normal-temperature printing head and the thermal printing head are used for printing high-viscosity materials; the bottom plate is further provided with a plurality of electromagnetic valves and a control circuit board electrically connected with the electromagnetic valves, and the control circuit board is used for spot-jet printing of low-viscosity materials. A nozzle is arranged at the bottom of the electromagnetic valve, and a top inlet is communicated with the low-viscosity charging barrel through a gas path; the low-viscosity charging barrel is sequentially communicated with a proportional valve and an air pump through an air path and is used for extruding and discharging materials to the electromagnetic valve; a heating assembly is arranged outside the thermal printing head and comprises a heat conduction block, a heating rod and a thermocouple are arranged on the heat conduction block, and a heat insulation layer is arranged on the periphery. The utility model further discloses a dual-mode biological 3D printer with the printing head assembly. According to the utility model, high-viscosity materials and low-viscosity materials can be printed at the same time, spot spraying and extrusion are combined, the defect that the low-viscosity materials cannot be printed in a pure pneumatic extrusion mode is overcome, and normal-temperature printing and heating printing can be realized.

The invention discloses a spray head plate of a printer and a printing system, relates to the technical field of ink-jet printing, and aims to solve the problem of high printing cost caused by the fact that one spray head plate is only connected with one spray head in the prior art. The nozzle plate comprises an FPGA chip, a controller, a driver and a nozzle switching assembly. The spray head switching assembly is connected with a plurality of or a plurality of spray heads; the FPGA chip receives the initial control instruction, converts the initial control instruction into a recognizable control instruction and sends the recognizable control instruction to the controller; the controller determines a target nozzle based on the control instruction, and sends a first digital driving signal in the control instruction to the FPGA chip after the target nozzle is determined; the target nozzle comprises at least one or one nozzle; the FPGA chip converts the first digital driving signal into a second digital driving signal and sends the second digital driving signal to the driver; the driver is further connected with the spray head switching assembly and converts the second digital driving signal into a target analog signal so as to drive a target spray head.

The utility model belongs to the field of gilding, and particularly relates to an intermittent gilding device which comprises a digital printing mechanism, a gilding unwinding assembly, a gilding winding assembly, a cache mechanism, a gilding mechanism and a rack, and the digital printing mechanism, the gilding unwinding assembly, the gilding winding assembly, the cache mechanism and the gilding mechanism are all arranged on the rack. The rack is provided with a gilding film path used for winding and unwinding a gilding film, and the gilding film path sequentially passes through the gilding unwinding assembly, the buffer storage assembly, the gilding mechanism, the buffer storage assembly and the gilding winding assembly. The rack is further provided with a processing path used for carrying out digital printing and gold stamping on a printing material, and the processing path sequentially passes through the digital printing mechanism to the gold stamping mechanism. According to the utility model, the gilding film is more fully utilized when being used, so that a large amount of waste of the gilding film is avoided, and the printing cost is reduced.

The invention discloses a centrifugal single-material photocuring 3D printing method and equipment. The equipment comprises a printer body, a rotating motor, a cleaning tank and a post-curing heat treatment tank; the rotating motor is fixedly connected with a printing platform of the printer body and used for driving the printing platform to rotate. A resin tank of the printer body is detachably arranged below the printing platform; the cleaning tank can be arranged at the station of the resin tank, so that after the rotary motor drives the printing platform to rotate to complete centrifugal operation and remove the resin tank, the cleaning tank can be arranged at the station, and the printing equipment executes cleaning operation that the cleaning tank is fixed and the printing platform and a printed piece rotate in cleaning liquid; the post-curing heat treatment tank is configured to be arranged at the station so that after the cleaning operation is completed and the cleaning tank is removed, the post-curing heat treatment tank can be arranged at the station for the printing equipment to execute post-curing heat treatment in which the post-curing heat treatment tank is fixed and the printing platform and the printed piece rotate in the post-curing heat treatment tank.

The invention discloses multifunctional 3D printing equipment, and particularly relates to the technical field of photocuring printing, the multifunctional 3D printing equipment comprises a printer shell, a curing transparent plate, a support frame and a large-range printing identification mechanism; the large-range printing recognition mechanism comprises a bidirectional screw, a gear motor, two sleeving blocks, a rack, a gear, a rotating shaft, a sleeving block, a linkage strip and an infrared sensor, and further comprises a synchronous shielding mechanism. Through the large-range printing recognition mechanism, the 3D printing device has the advantages that the situation that an operator is not at a station is automatically recognized, shading protection can be conducted on a liquid photosensitive resin material in time, local waste of the liquid photosensitive resin material is avoided, the photocuring 3D printing cost is greatly reduced, and more printing cost is saved; therefore, the problems that the liquid photosensitive resin material is wasted and the 3D printing cost is greatly increased due to the fact that shading protection and suction protection are difficult to carry out on the liquid photosensitive resin material in time are solved.

A printing screen with an improved structure comprises a screen frame and screen cloth. The screen cloth is arranged in the screen frame, and the screen cloth is composed of a plurality of yarns. Each yarn is curved and has a plurality of wave crests and a plurality of wave troughs. The screen cloth is provided with a pattern opening area, and the pattern opening area comprises a first pattern part. Wherein the line segment of the yarn in the first pattern part is substantially not provided with a wave trough.

The invention relates to a preparation method of ink, in particular to a preparation method for improving the adhesive force of water-based ink by taking modified zeolite as an additive. The zeolite is subjected to phosphate functional group modification, so that the water-based resin material can be better connected, the connection performance of the ink and the resin material is greatly improved, and the adhesion performance and the water resistance of the ink on paper are further improved.

The present invention relates to the technical fields of signal transmission, data recognition, artificial intelligence generated content and printing, and provides an intelligent control method, device and computer equipment for background color printing. By configuring a printing type database, a question model and a reply model, a human-computer interaction interface is generated according to the answer mode limitations of the printing type database and the reply model. In response to the user's selection of specific options in the printing type menu options and the reply mode menu options of the human-computer interaction interface, an intelligent question and answer limitation list for background color printing is generated and sent to a generative artificial intelligence model. The generative artificial intelligence model generates a background color printing standard for a specific printing type that meets the answer mode limitation based on the background color printing intelligent question and answer limitation list, and then generates an editable printing control module based on the background color printing standard for the specific printing type and transmits it to a manual review end for processing, thereby reducing printing costs, improving the efficiency of background color printing, and improving the stability of printing quality.

The utility model discloses a printing ink saving device capable of accurately controlling ink, which comprises a box body, a partition plate dividing the box body into a liquid storage cavity and an adjusting cavity is arranged in the box body, an adjusting assembly is arranged in the adjusting cavity, the adjusting assembly comprises a threaded rod, a limiting plate is fixedly arranged at the end of the threaded rod, and the limiting plate is connected with the liquid storage cavity. A piston is fixedly arranged on the limiting plate through a reset spring, a bearing is arranged on the threaded rod located outside the adjusting cavity in a threaded and sleeved mode, and a supporting frame is fixedly arranged outside the bearing. The motor drives the stirring shaft to rotate so as to prevent ink from caking, meanwhile, the connecting block at the end of the stirring shaft drives the rotating shaft to rotate, the belt pulley B drives the threaded rod to move, the internal capacity of the adjusting cavity is controlled, and the cross three-way valve is used for adjusting the air pressure conveyed into the adjusting cavity. Therefore, the flow rate of the discharged ink is controlled, and accurate ink control is realized.

The utility model discloses a plate-free gilding press, relates to the technical field of gilding presses, and aims to solve the problem that the printing effect is affected when the gilding paper is repeatedly used due to the fact that the gilding paper is easy to wrinkle when being rolled. According to the technical scheme, the gold stamping machine is characterized by comprising a machine base, a gold stamping frame sliding on the machine base, a winding disc fixed to the gold stamping frame and a base rotating on the winding disc, a winding barrel is fixedly connected to the winding disc, a first groove is formed in the winding barrel, and a positioning frame is fixedly connected to the side, away from the winding disc, of the winding barrel; the side, close to the first groove, of the positioning frame is rotationally connected with a rotating column. According to the plate-free gilding press, the winding drum can fix gilding paper before gilding, and when the gilding press works, the two sides of the winding drum can be smoothed to prevent skewing during winding, so that wrinkles inside a gilding paper roll at the winding drum are avoided, and the gilding paper roll is prevented from being damaged. And meanwhile, irritant gas exhausted during printing can be treated through a fan and an activated carbon containing frame which are arranged on the gilding press.

The invention belongs to the technical field of additive manufacturing, and particularly relates to a 3D printing inorganic binder forming method which comprises the steps that metal powder is prepared; a powder layer is laid on a workbench of printing equipment through the prepared metal powder, an inorganic binder is sprayed to the powder layer according to a printing slicing software pattern, and then the metal blank is obtained through sequential layer-by-layer printing; curing and clearing powder; and sintering. An inorganic binder is adopted for 3D printing forming, no pungent smell is generated in the printing process, and no harm is caused to the body of an operator; green body sintering is free of carbon emission, a metal test block is free of oxidation, and the product sintering quality is good; in the whole sintering process, the toughness of the metal green body can be enhanced, and cracking of the metal green body is inhibited; compared with an organic binder, the inorganic binder has no degreasing process in sintering, so that the sintering period can be shortened.

This utility model provides a modular structure, including a head and a body. The head has a first connecting hole, and the body has a first connecting portion. The cross-section of the first connecting portion is circular, and the cross-section of the first connecting hole is adapted to the shape of the cross-section of the first connecting portion. The head and the body are detachably connected by inserting the first connecting portion into the first connecting hole. This solution forms a modular structure with a head and a body. The head has a first connecting hole, and correspondingly, the body has a first connecting portion. Inserting the first connecting portion of the body into the first connecting hole of the head allows for a detachable connection between the head and the body, facilitating independent production of the head and body and reducing the design and production costs of the modular structure.

The present application relates to the technical field of 3D printing, in particular to a processing step and method of a coating process TPU. The present application uses the post-processing technology of the formed part to process the formed part, which not only improves the FDM printing speed by 3-4 times, can realize the successful printing of complex models that cannot be realized in the FDM printing process of TPU, and breaks through the color printing of flexible materials. Moreover, after the processing of the formed part, the interlayer bonding force is greatly increased, and the surface effect is equivalent to the SLA surface fineness. Such a process not only breaks the limitation of 3D printing that can only print single color with special design shoes, but also greatly reduces the printing equipment cost, the formed part printing cost, improves the efficiency, realizes color printing, and more importantly, the printed object can be directly worn. At the same time, the hardness of the formed part of the present application will be maintained at about 70A, which is suitable for printing various wearable products and is suitable for various industries.

The invention relates to the field of machine vision, and discloses a machine vision method and system for self-adaptive ink supply optimization in gravure printing of decorative paper. The method first collects an image sequence of the anilox surface morphology of an anilox roller for gravure printing of decorative paper to be optimized, obtains initial three-dimensional point cloud data, and obtains a three-dimensional model of smooth dots; then extracts dot morphological parameters, constructs an ink supply optimization model to predict the initial ink supply; finally, starts gravure printing and collects visual images of the anilox roller surface in real time, calculates the overall ink uniformity and defect rate, and corrects the initial ink supply accordingly; the invention can dynamically adjust the ink supply according to the actual printing state of the dots, thereby effectively improving the printing quality and efficiency of gravure printing of decorative paper.

The utility model relates to the technical field of printing ink supply, and discloses an ink supply device for a flexo printing machine. The ink supply device for the flexographic printing machine comprises a base and an ink supply structure, the ink supply structure is installed on one side of the base, an ink transfer groove is formed in the base, the ink transfer groove is connected with the ink supply structure through an ink supply pipe, an ink fountain roller is rotationally installed in the base, a groove is formed in one side of the ink transfer groove, and the ink fountain roller is connected with the ink supply structure through the ink supply pipe. A groove is formed in the base and is close to one side of the ink fountain roller, an ink transfer roller is rotatably mounted in the base and is close to the ink fountain roller, one end of the ink transfer groove is fixedly connected with a first motor, the first motor is connected with a rotating shaft through an output shaft, and a plurality of millstones are fixedly mounted on one side of the rotating shaft; according to the device, the ink limiting plate is tightly attached to the inner wall of the ink supply structure to limit whether the ink can enter the ink transfer groove through the ink supply pipe or not, and waste caused by excessive adding and incomplete use of the ink is reduced by controlling the supply amount of the ink.

The device comprises an ink staining wheel (71), a character head roller (72), an ink wheel (731), an ink wheel support (732), an ink wheel support (736) and a supporting wheel (74), the ink wheel (731) is installed on the ink wheel support (732), an elastic pin (733) is arranged in an opening of the ink wheel support (732), and a fixing pin is arranged on the ink wheel support (736); when the ink wheel support (732) is installed, the fixing pin enters the opening, the elastic pin (733) is compressed by the fixing pin, when the fixing pin abuts against the inner end of the opening, the elastic pin (733) releases compression, the fixing pin is clamped at the inner end of the opening, and the ink wheel support (732) is fixed to the ink wheel support (736). According to the technical scheme provided by the invention, while the printing quality is guaranteed and the printing cost is reduced, the maintenance workload of the device is reduced, and the integrated control degree of the boxing machine system is improved.

The invention discloses a black and white printing paper code point identification method for an intelligent paper pen, and the method comprises the steps: carrying out the preprocessing of the homework content, and obtaining a homework printing file containing code point information; carrying out black and white printing on the job printing file to obtain a paper piece containing code point information; recording code point information and handwriting of a specified area on the paper in real time through the intelligent pen to obtain handwriting data; code points on the handwriting data are decoded through the intelligent pen, a local writing image is obtained after correction and restoration, and finally the local writing image is transmitted to the server; and the server summarizes the local writing images according to the position relationship corresponding to the code points to obtain the overall writing content. A common black and white printer can be adopted for printing operation, the printing cost is lower, the printing speed is higher, and the requirement for equipment is lower; meanwhile, the influence of damage of answer lines and local code points or unclear printing is avoided, and the automatic error correction capability is high; and meanwhile, the writing state and the pen holding state can be effectively monitored, and whether the pen is broken or not is monitored.

This invention aims to provide a 3D printer nozzle, mounted on the heating module of the print head, comprising a nozzle cap and at least two blocks. One side of each block has a slot, and the other side has a retaining strip. The blocks also have arc-shaped grooves. The slots and retaining strips engage to form a single unit, while the arc-shaped grooves together create a material channel. The unit is screwed to the heating module, and the nozzle cap is screwed to the unit. The nozzle cap has a spray hole that communicates with the material channel. This allows for rapid cleaning of residual material within the unit, improving printing efficiency and reducing printing costs.

The invention discloses a tattoo sticker printing method and a tattoo sticker printing device, belongs to the technical field of printing, and is used for solving the problems of how to simplify operation steps, improve the stability of a tattoo printing effect and reduce the use of consumables. The tattoo sticker printing method comprises the steps that a tattoo film serves as a heat transfer printing belt and is put into a heat transfer printing machine; and putting the transfer paper as a printing medium into a thermal transfer printer for printing. The tattoo sticker printing device comprises a shell, a printing head, a paper feeding mechanism, a tape feeding assembly, a tattoo thermal transfer ribbon and transfer printing paper. The shell is provided with a paper feeding channel for conveying transfer paper; the belt conveying assembly comprises an unwinding shaft and a winding shaft, and the unwinding shaft and the winding shaft are rotatably arranged in the shell; the tattoo thermal transfer ribbon is provided with a coating for printing a tattoo, the two ends of the tattoo thermal transfer ribbon are connected with the unwinding shaft and the winding shaft respectively, and a printing section is arranged between the unwinding shaft and the winding shaft; and the printing head is used for transferring the coating of the printing section to transfer paper so as to form a tattoo pattern on the transfer paper.

The application provides a 3D inkjet printing device, a model material quantity determination method and device. The quantity of at least two model materials required by the 3D inkjet printing device for printing a 3D model can be determined according to different printing modes of the 3D inkjet printing device. Therefore, the quantity of the at least two model materials required for printing the 3D model can be determined more quickly and effectively before the 3D inkjet printing device prints the 3D model, so that early quotation and / or early judgment of whether the quantity of the materials stored in the 3D inkjet printing device can meet the requirements can be realized, and the materials for replenishment can be prepared in advance, so that the normal use of the 3D inkjet printing device is ensured, and the user experience of the 3D inkjet printing device is improved.

The invention relates to the field of printing equipment, and discloses a PVC decorative film printing equipment. In this scheme, a pattern is split into multiple parts, which are respectively arranged on different mold cylinders. In this way, after a rolling shaft embosses the texture on the surface of the corresponding mold cylinder onto a film, a mounting plate drives the rolling shaft to rotate as a whole, and switches to the next rolling shaft. After the rolling shaft rotates and embosses the texture on the surface of the corresponding mold cylinder onto the film, the two embossed textures are seamlessly connected. In this way, the rolling shafts are continuously switched for embossing until all the rolling shafts complete one embossing, so that the textures split on the surfaces of different mold cylinders form a large-scale complete pattern on the film. In this way, the embossing work of a large-scale pattern can be completed with simple equipment, and the equipment has a simple structure and less precision accessories, so that the use cost and later maintenance cost of the equipment are greatly reduced. At the same time, the mold cylinder can be freely replaced, so that the application range of the equipment is wider.

The invention relates to the technical field of additive manufacturing, and particularly discloses a powder supply device, additive manufacturing equipment and a powder supply method. The powder supply device comprises a powder weighing platform, a filtering assembly, a driving assembly, a powder feeding assembly, a powder spreading assembly and a control system. The powder weighing platform is arranged on one side of the powder laying platform; the filtering assembly comprises a filtering part, and the filtering part and the powder weighing platform are provided with a first working position and a second working position which are matched with each other; the driving assembly is used for driving the powder weighing platform and the filtering part to be switched between a first working position and a second working position; the powder feeding assembly is arranged above the powder weighing platform and used for supplying powder to the powder weighing platform. And the powder spreading assembly is used for pushing the remaining powder after the upper layer is formed to the filtering part located at the first working position and pushing the powder on the powder weighing platform located at the second working position to the powder spreading platform. According to the powder supply device, residual powder after upper-layer forming can be recycled after being filtered, and the powder utilization rate is increased.

The present invention relates to the technical field of premixed mortar, and in particular to an environmentally friendly water-based embossed effect ink and a preparation method and application thereof. The water-based embossed effect ink comprises: acrylic hard emulsion, acrylic soft emulsion, water-based solid acrylic resin, diethylene glycol monobutyl ether, large-particle polyethylene wax, normal-particle polyethylene wax, water-based surfactant, water-based silicone oil, monoethanolamine, water, photoinitiator, leveling agent, fumed silica, pigment, dispersant, thickener, carbon nanotube / silver complex and post-treatment agent. The water-based embossed effect ink designed by the present invention has excellent film-forming strength, toughness and light-resistant discoloration ability, further expands the application range of the water-based ink and optimizes the surface state after use, and is suitable for industrial promotion.

The utility model relates to the technical field of UV printer ink supply, in particular to a UV printer ink supply device convenient to replace an ink cartridge, which comprises a positioning plate and a box cover, the positioning plate is provided with a positioning mechanism with a function of limiting the movement of a box body by a loop bar, the positioning mechanism comprises a sleeve, and the sleeve is in interference fit with the loop bar. A sleeve rod and a sleeve in the positioning mechanism are matched to enable a triangular positioning plate to keep a horizontal state and a movable state, when the triangular positioning plate makes contact with the ink box, the sleeve rod slides into the sleeve, a spring is squeezed by the triangular positioning plate to be compressed, and at the moment, the ink box can be taken out upwards; the triangular positioning plate can be driven to be clamped into the inclined groove and lock the ink box through rebounding of the spring, through the design of the positioning mechanism, the advantages of rapid automatic locking and rapid unlocking of the ink box are achieved, meanwhile, the speed of replacing the ink box is increased, and the replacing steps of the ink box are simplified.

The invention relates to the technical field of lithographic printing, in particular to surface-active alcohol-free fountain functional water and a preparation method thereof. The surface-active alcohol-free fountain functional water is prepared from the following raw materials in parts by weight: 8-15 parts of glycerol, 8-12 parts of disodium hydrogen phosphate, 6-10 parts of citric acid, 4-6 parts of gum arabic, 3-6 parts of propylene glycol, 2-5 parts of ethylene glycol monobutyl ether, 0.8-1.5 parts of magnesium nitrate, 2-4 parts of a dispersing aid, 0.6-1.0 part of a metal protective agent, 0.5-1.0 part of an antibacterial agent, 1-2 parts of a compound aid, 1-3 parts of a defoaming agent, 2-3 parts of a wetting agent and 70-90 parts of deionized water. The prepared surface-active alcohol-free fountain functional water has excellent oxidation resistance and also has excellent antibacterial performance, so that the service life of the water is prolonged to a certain extent, and the quality of the water is guaranteed; moreover, the fountain solution can replace traditional alcohol fountain solutions, toxicity is reduced, safety and environmental friendliness are improved, meanwhile, the printing effect and quality are improved, and the printing cost is reduced.

The present invention relates to the field of automatic control technology, in particular to a 3D printing stacking modeling robot arm and method, comprising a multi-axis motion platform, a power assembly, which is arranged on the top of the multi-axis motion platform and located on the top of the molding platform, and is equipped with a sealing assembly, a 3D extruder and a nozzle to provide power for movement; a sealing assembly, which is arranged on both sides of the power assembly, and is equipped with a closed nozzle and will cooperate with the 3D extruder to heat the nozzle; the 3D extruder, which is arranged at the bottom of the power assembly, is equipped with a melted material and extruded, and at the same time, hot air is delivered to the sealing assembly through an air pump to heat the nozzle; the nozzle, which is arranged at the bottom of the 3D extruder, is equipped with a guide for the melted material, and at the same time, a fixed plate is driven by a telescopic rod to clean the inner side of the spiral plate. The present invention can ensure that the nozzle will not lose temperature when the material is replaced, is easy to clean, and can control the temperature of the nozzle in advance.

The present invention discloses a method for online real-time prediction of component state based on deep learning. The present invention first collects the size and shape of the molten pool and the deposited layer under different process parameters, and calculates the shrinkage of the material from the molten state to the solidified state; then the size and shape of the molten pool and the deposited layer, the shrinkage of the deposited layer, and the process parameters collected are used as input, and the stress value of each point in the manufacturing is calculated in the finite element simulation, and after these parameters are subjected to multi-information feature fusion processing, the real-time stress value of the component in the manufacturing process is output; through a large number of experimental samples, the real-time stress curve diagram and the component morphology diagram in the manufacturing process are obtained and correspond one by one, and the samples are classified into four states of normal, deformation, pre-crack and cracking. Through convolutional neural network training, the state of the output component in the manufacturing process is output. The method can obtain the constructed stress and state, effectively solve the defects such as deformation and cracks in the manufacturing process so as to adjust and optimize the process parameters in time.

The invention discloses a multi-material 3D printer, and relates to the technical field of 3D printing. The 3D printer comprises a printing head, a heating head, a guide assembly and a comprehensive driving assembly are sequentially installed in the printing head from bottom to top, and a plurality of wire conduction assemblies are annularly arranged in the guide assembly; a positioning conical groove and a blocking inclined groove are sequentially formed in the heating head from bottom to top. According to the device, the arrangement of a single heating head and multiple switching heads is adopted, the comprehensive driving assembly and the guide assembly are matched, the conical switching heads can be automatically switched from the heating heads, during switching, the cooling system enables the wires to be rapidly solidified in the conical switching heads, the conical switching heads move to the positions of the plugging chutes, the arc-shaped inclined openings are plugged, and rapid switching of the wires is completed; and the multiple wires are heated at the same time, new wires do not need to wait for heating time, seamless switching is achieved, the switching speed is high, and due to the fact that the wires are accumulated in the conical switching head all the time, wire waste can be reduced.