Using Obj. and stl. files

[zymon]

He's right you're presenting him with things which are not CAD/CAM friendly, you should be using STEP and/or IGES if you want cross-platform compatibility.
Use Free Cad to convert your meshes to solids, it's well documented on line how, someone may post a link to instructions.

I was under the impression that to convert mesh files like obj. to nurbs files like 3dm. was very difficult and the software that does it is very expensive.