Ooh, fun! I don't have my own printer, so I have to use the ones at the library (when it's open ) or at Shapeways. Mostly what I do is dice (there's a link in the RPG Member Commercial Content thread), but lately, I've been working on a more ambitious (and much slower) project: Between 3D printing and laser-cutting, I think I can come up with a design for a real, functioning tuba, that could be made for under $100.