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Not sure if this counts as a robot, but it does use a servo and has a circuit. This is my second useless machine actually, the first one I sold to a friend. The first one I slapped together but the second one I designed on the computer first and then measured out all the parts, trying to get it as small as possible. The limiting factor was the battery case which holds 4 AA's.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/useless-machine