http://discourse.mcneel.com/t/hollowing-out-insides-of-solids-how-is-this-best-done/15703/2
Do note the “If you don’t want to do anything in Rhino with the result” part there.
http://discourse.mcneel.com/t/hollowing-out-insides-of-solids-how-is-this-best-done/15703/2
Do note the “If you don’t want to do anything in Rhino with the result” part there.