Wow, take a look at this Spherical Gear System which was modeled by New York-based Proxy Design Studio. It is certainly one large file, that's for sure. There are over 1 million faces to it, and it's really something that can only be 3D Printed. Check the pictures out below, then watched the Youtube video. I think if I bought one of they, which you can buy on Shapeways for $199.00 I would never put it down.