I love Tony Buser’s 3D-printed Mars rover, especially how unrealistically cute he is!
Articulated, snap together, Mars Rover! No screws, glue, or support structure needed (although some glue in a few places wouldn’t hurt). All the parts can be posed, turned, twisted. The wheels turn and the legs even pivot like the real thing to go over obstacles! Unfortunately, it is not autonomous.
[Via the Thingiverse Blog]