-This is a sample to look in to. It sure need more work do. -ACIS works best as default kernel for surfaces. -When a surfacepart is a closed volumne, it turn in to a solid. Robert Andersson
Sorry, this is only a sample hove this shape CAN be created in IronCAD. I attatched an ICS, but the upploader grabbed my first attach (.jpg) again. So here is (hopepully) the ICS: