Just to back up Rob's point, I have a 4+ GB STL that I have been working with in SpaceClaim without a problem. I do have a nice workstation that can handle it, and would never try it on my laptop. Rob, is there a limit on the number of triangles for a student version of ANSYS? Maybe that could be a problem (just a shot in the dark). Although it would probably throw up an error under such conditions.