Hi Michael T.

> Know of any freeware 3D model viewers?

Well, Adobe Acrobat Reader is one, it can view 3D models since a couple of versions ago. The good thing about that one is that a lot of people already have it installed in order to view 2D PDF files.

There are various other viewers out there as well, but using the Acrobat one is probably your best bet for one that might not need any further installation done.

- Michael