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Roberto Lou Ma has built a variety of ramp walking toys (see his youtube channel). The one that caught my eye was the walking robot. I started building one quite some time ago, but got hung up on how to make the feet. The bottom sides of the feet are actually turned into a part of a sphere using a lathe.
I don't have a lathe.
I am, however, borrowing a MakerBot Cupcake 3D printer from a friend. Naturally, I printed the feet out of ABS plastic using the MakerBot.
Check out the video of my robot walking.