An important step in the 3D printing process is to convert the 3D design file to a 3D model file in .STL format. An .stl file is basically a 3D model defined with numerous triangles, so the file contains a complete list of the XYZ coordinates of the normals and vertices of all these triangles. If there are too many triangles defined in this file, the file will be too large and will be called a "bad" file. At this point, some clichés become quite important. Today, I'd like to share some notes on the steps to convert .stl file format, and the problems that may occur during the conversion of .