Hi Tom,
I also work with MoI and ArtCAM. I try to use each program for their strengths. Rather than bring a model from ArtCAM into MoI, if I see an advantage in designing a particular model in MoI, I'll do the design work that MoI is adept at first, then export an STL to ArtCAM to do things like arraying lettering around a curve or surface texturing.
It may be a personal preference, but I also find it easier to draw 2D artwork or trace an image in MoI and then export an .AI file to A.C. where it can then be given 2.5d dimension.
ArtCAM can export OBJ's and STL's but as Michael pointed out, the advantages of bringing an STL model into a program like MoI or Rhino are really pretty minimal since there isn't much you can do with an STL in a NURBS program.
-Jesse
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