Motorized propeller beanie
thingiverse
Don't all self-respecting nerds have one of these lying around? My initial plan was to make it solar powered, but I had to opt for AAA batteries instead. The motor and propeller came from a 6-in-1 educational solar kit that I salvaged. You could even print your own propeller and use a motor from a CD player or any other motor you have on hand. To assemble, print with zero infill and no shells; drill the hole for the motor using a drill press, connect wires, add an on/off switch if desired, and secure everything in the beanie - representing nerdom!
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