Self-bondage handcuffs
thingiverse
These handcuffs make it easier to perform self-bondage. With some effort you can tie yourself behind your back with these handcuffs. Use a timer-lock for the ultimate locked up experience. I have not tested the filleted versions. Use the inner and outer pins to create hinges. Use two m5x20 screws and 2 M5 nuts to secure the cuff to your wrist. After that slide the lock through the two holes and lock yourself up :). If you want a way out in case of emergency make sure not to tighten the nuts completely.
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