Thingiverse
Prison Keys & Keyring
by smallhacks
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Can be used in education for gamification to increase extrinsic motivation.
For ex. give one key when a student solves a math puzzle like the [100 prisoners problem](https://en.wikipedia.org/wiki/100_prisoners_problem).
Fast & easy to print.
For ex. give one key when a student solves a math puzzle like the [100 prisoners problem](https://en.wikipedia.org/wiki/100_prisoners_problem).
Fast & easy to print.
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