Hi Michael

Running obj23dmwireframe from the command line in wineskin.app worked has a test I used a 6MB obj file I had of a spaceship with serious amount of detail both outside in inside, it produced a 23MB 3dm file. 1000s of closed cures, hit select all, -> construct-> planar, run for about 5 minutes then crashed out. Well planar crashed out but MoI was still working it :) it created 27911 surfaces. I was really impressed, the 3dm file grew to 1.8GB :)