Thinking about building @Smartfriendz_3d_prin smartcore using 2020 extrusion as frame, and my makibox as parts. Wanted to change a few things, but coding 3d objects just not my cup of tea.
STL files is not good for assembly in the CAD environment. So I just recreated the design (with some tweak) in Inventor. A step file is available for import to other CAD.