3D scanner, also known as 3D scanner or digital reading machine, is mainly used to collect 3D data of real object surface, and then use the collected 3D data for reverse engineering, product design, secondary creation and 3D detection (size, angle, radian, etc.). For example, 3D scanning medals, obtaining 3D data, enlarging or reducing 3D data size in equal proportion, carving in small batch with metal engraving machine or printing with metal 3D printer, etc.