Rattleback
Description
Edit: I had some trouble with this originally and VeryWetPaint was nice enough to fix some things and uploaded a derivative. I didn't want to leave this half finished though so now that I've printed and tested, I'm updating with new models and the original Inventor files. If I get a chance I may try to figure out how to model this in Openscad. A fun and confusing toy that will rotate freely in one directly, but when spun the opposite direction will stop, wobble, and reverse directions. More on wikipedia: http://en.wikipedia.org/wiki/Rattleback Uploaded at the request of Spacexula
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