A fairly simple model, made in SketchUp 8 Pro using the Solid Tools and exported to STL using the su2stl.rb ruby-script. As you will see, this model has some (minor) issues; such as missing face and some open edges. The free version of NetFabb Studio Basic is able to automatically repair them.
Oh, this works on Windows and on Mac, which is quite uncommon for such software. (There is no audio with this video)