>With ViaCAD, I can see on their website that it imports Rhino files , will it out put 3dm file? is it easy to move models between MoI and ViaCAD ? (there does not seem to be a demo I can play with )

3dm import does not work except if you plan to import basic shapes. .SAT is the way to go.





But is worth the $100 for me that I often need to bring DXF/DWG into MoI :)

Incidentally. the original file supplied in post 1 filleted perfectly in Inventor Fusion, with a 1cm fillet.