Mineways creates 3D models of objects in your Minecraft world, suitable for rendering and 3D printing. It is focused on being a bridge between Minecraft and Shapeways, a 3D printing service, though should print on any 3D printer. Models can also be exported for rendering on Blender or just about any other rendering application. Mineways is free, open source, and downloadable here.
Thanks for the kind words. If anyone's interested, there's lots of discussion going on about 3D printers and whatnot on the reddit thread. I also answer some questions there.
Some shots here:
More as I get them.