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Produces light when the spool is spun by weight and stringOther
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requires string, stepper motor, and LED. Due to excess friction in the gears i was never able to get it to light up by hanging a weight, but i was able to get it to light by spinning the spool. The original planetary gear set came from http://www.thingiverse.com/thing:1727833/#files
Materials and methods
print the planetary gears on rafts.
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