The people who are getting 3-D printers at home are pioneers, kind of like the people who bought Apple IIs in 1981. Adults are usually the last people to get it. The kids are like, 'Get out of my way, I want at this thing.' They immediately start getting creative.
One of the criticisms we get is, 'Does the world need more plastic crap?' But you have to look beyond the plastic crap, to the design, to the experience, to the empowering nature of the MakerBot and the community.