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Puzzle of Evil
Inspired by a Khan Academy Engineering blog post, I set out to make make a copy that I could take to the office. http://engineering.khanacademy.org/posts/evil-puzzle.htm
This puzzle has 2 sides, one is decptively harder than the other. Both are the same outside dimensions so they can be glued together.
Find out more about this puzzle and how I made it here: http://joes3dworkbench.blogspot.com/2015/08/modeling-puzzle-of-evil.html