3D Viewer App in Windows 11/10 opens .3mf files & allows you to open 3D models & then capture it with Mixed Reality video.

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.