A self-locking expansion mechanism and is a two-position locking mechanism too. It can be used to expand pipes or other cylindrical parts.Parts can be 3d printed or manufactured with CNC machine. If you plan to 3d print the parts, it is best to use resin material. ABS may not work well. Of course, you can modify some parts to meet ABS’s requirements too.Download the free 3D PDF format file here: https://www.tanerxun.com/self-locking-expansion-mechanism/.htmlIgnore the OBJ and FBX files, they are only used to meet cgtrader’s requirement.