Differential gears can be used for all sorts of interesting things, as YouTuber Maker's Muse demonstrates with this 3D-printed hand crank that only turns clockwise.
The mechanism of action appears to be similar to the famous Chinese south-pointing chariot devices:
It's possible the chariot above uses some other means like magnets, but the differential gear type is the most famous.
• This Mechanism only turns Clockwise, no matter what. (YouTube / Maker's Muse)
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