I was visiting the make magazine site and I saw a link to a blog called The Inventive Mind. Notice the D-shaft? I took that as a challenge for Sketchup and drew this:

What I’d like to do is blur the line between virtual reality and material reality with a 3D printing system. Of course, Sketchup really isn’t optimal for that. Blender is probably closer. In that regard, learning Blender is on my list of things to do next month. Seeing that my sketchup skills are now adequate for rough drawings.