Preview.app previews OBJ

Preview.app previews OBJ

Just in case you´re not aware of, but like Collada files OBJ can be previewed/navigate in Preview.app. Textures seems not to be recognised/displayed/included but as it´s in Preview.app you can export to an image format you like including PDF.

Cheers
Frank

STL files exported from Cheetah3D also can be opened in Preview.
Best way is just using Quick Look (Spacebar) + you can add plugins for additional file types.