THREE-DIMENSIONAL PRINTER

The present invention discloses a 3D printer, comprising: a printing platform; an automatic ink cartridge turning device for controlling the printing angle of different ink cartridges to indirectly control the inkjet printing precision of different solution materials; an automatic cleaning sprayer device for automatically cleaning the printhead during the inkjet printing process; a printhead ink droplet observation device for feeding back the ink droplet image collected when the printhead flashes to the control component for processing, so as to observe the quality of all the spray orifices of the printhead and optimize the inkjet printing parameters; a feeding component for switching ink cartridges containing different solution materials to the printing platform for inkjet printing; a control component for controlling the ink cartridges switched to the printing platform to move on the printing platform, driving inkjet printing, dispensing/scraping, heating and air pressure, etc. according to the instruction of the control component; wherein the feeding component comprised: a plurality of ink cartridges for respectively storing different solution materials; a switching control device that switches the ink cartridge storing the corresponding solution material to the printing platform in accordance with the current printing step. When the 3D printer executes the printing scheme, it automatically switches to the ink cartridge where the corresponding solution material is located according to the current printing step, thereby realizing the fully automatic inkjet printing of the multi-layer structure.