As the name suggests, Open 3D Model Viewer is a dedicated free and open-source 3D file viewer for Windows 11/10. In it, you can visualize 3D models of formats including 3DS, OBJ, PLY, DAE, STL, etc.

The two work very differently, especially when it comes to editing. 3D printing has a long history of using .stl files (which are meshes) but making engineering-type changes to such files is ...