[joeclark77]

3D printing, when it becomes possible to make things a little more sophisticated than a few plastic shapes. For example, imagine if you could set up a robotic wood shop in your garage, using ordinary tools, and you could download a piece of furniture. I think there'd be some very interesting business models that would come out of something like that. Perhaps you're buying the furniture, or perhaps you're selling it to your neighbors as a franchiser for some kind of virtual IKEA in the cloud. Metal shops and other kinds of fabrication, similarly, would be great.