3D printing, which is a kind of rapid prototyping technology, is a kind of technology based on digital model file, which uses powder metal or plastic and other adhesive materials to construct objects by layer printing. The control software used for 3D printing is free and open-source repeater host. You can download the latest version on the official website: https://www.repeater.com/3d printing uses the general STL file format. Users can design 3D models and convert them into STL files, or search for free model files on the network and import them directly. Yuejiang magician's mechanical arm supports the printing of PLA materials with a printing accuracy of 0.1mm.