I don’t do 3D printing, because I don’t have the space to do 3D printing. But the 3D Printable Dungeons & Cities Humble Bundle looks like a rather good deal: a bunch of 3D mini recipes for RPGs and whatnot, starting at a buck and going all the way to lots for fifteen bucks. Plus, it’s for the Navy-Marine Corps Relief Society charity, which looks pretty solid.
At least worth a look, methinks.