Wobbly is a 3D-printed, gravity-powered, walking automaton. He basically walks down slopes.
You can see him in action here:
His design was based on the instructions provided by Roberto Lou Ma for making a wooden walking robot. (http://blog.dugnorth.com/2011/02/download-plans-for-ramp-walking-wooden.html)
The files for printing him are available on Thingiverse here:http://www.thingiverse.com/thing:170932
On Thingiverse, there are also some remixes that other users have created! It really makes me smile when I see other people print or remix Wobbly. 😀