Well, I have been selling some parts, but mostly to other Reprappers. I'm looking for ways to develop something more extensive with it, but it's one of a stack of fabrication-related ideas I'd like to play with, each more attractive. The main problem is that printing is slow, and linear. You can't easily scale it. Some people are building botfarms, but even then their supply is linear, and limited by space.

Pop over on the #reprap channel on freenode and meet the rest of us if you want to know more.