Here are a couple of 3D programs to look at.
Try MOI3d http://moi3d.com/ a relatively inexpensive nurbs-based modeler with excellent export filters. My brother uses it to generate 3d-printed objects that he uses to create spin-cast metal objects from. He sculpts the objects in real time as though he' s cutting clay.
There is also freeware applications such as Blender 3d which I've used once. It has quite a steep learning curve though so have patience if you've never used it before. http://www.blender.org/
Great show as always. Keep up the great work.