A 3D printer is a device that can "print" real 3D objects. The function is the same as the laser forming technology. It uses layered processing and overlay molding, which means that 3D entities are generated by adding materials layer by layer, which is the same as traditional material removal processing. The technology is completely different. With reference to its technical principles, it is called a "printer" because the layering process is very similar to inkjet printing.