To put it simply, 3D printing refers to the creation of a three-dimensional physical object by adding materials to the 3D printer that can “print” a real object, layer by layer, and superimpose it. Speaking of a slightly more professional point is that the software completes a series of digital slicing through computer-aided design techniques and transmits the slicing information to a 3D printer. The 3D printer uses raw materials to stack successive thin layers one by one up to a solid object. Forming, so the industry is also called rapid prototyping, 3D printers are also called rapid prototyping machines. Due to the variety of specific stacking formats, a variety of 3D printing processes are produced, and the types of materials that can be printed in each process are also different, such as common SLA (laser cured photosensitive resin molding), FDM (melt extrusion Molding), 3DP (three-dimensional spray bonding molding), SLS (selective laser sintering molding), Ployjet (ink-jet molding), and the like. "These five mainstream 3D printing processes have equipment here." Mr. Shao, marketing director of Beijing Top Extension Technology Co., Ltd., pointed at the rows of machines. "The current 3D printable materials are plaster, nylon, Abs plastics, pcs, resins, metals, ceramics, etc. These 3D printing materials are all new materials developed specifically for 3D printing. They are not ordinary gypsum, plastics, resins, and the raw materials are generally powdered. Shaped, filamentous, liquid."