I used 3ds max to create a model. I ran the STL check. THOUSANDS of errors! Thousands of open edges. I tried welding individual verticies together to get rid of the problem, but no such luck. I have attached a .3ds file (as the STL export is riddled with errors). Joris (bless his heart) has been trying to help me, but so far I've not been able to get past the "non-manifold" block that the servers have up.