Ratchet and Pawl
thingiverse
A ratchet is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. It is commonly used in Bi-cycle ,Tools and Machinery. Use default printer setting, that will do the job. For the motor i have plastic 60 rpm gear motor, some rubber band and glue. for Working video: https://youtu.be/m2L5P6qMNHw
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