Hi Michael,

Thanks for taking the time to write back, I did quickly try a .OBJ file and it did cause the same problem.

I am using a Keyshot trial for rendering. Here is a quick render: http://oi44.tinypic.com/27x0xlt.jpg

I think you might be right that it could be an overlap problem. Could I do a small, maybe .001 offset or something on the interior cube so that they don't overlap, or which method would you suggest?

If I simple made a larger square with no thickness, I'm not sure I could include the foot of the base.

Thanks,
Misiu