Thingiverse
Retractible Cord Or RubberBand Battery
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A simple pull string mechanism powered via rubber band. The spool posts are a bit long so someone could put a gear on it and use this to power a clockwork contraption or pull string toy. (If you don't need the extra lenth just clip them to size) Or you could use it as a retractable key leash {or lighter leash combined with my bic lighter holster)
Also makes a great powered wheel. Just omit the string and wedge the rubber band between the two shells after pulling it through the center spool
Also makes a great powered wheel. Just omit the string and wedge the rubber band between the two shells after pulling it through the center spool
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