Penny Box (Puzzle Box)
thingiverse
Buy a high-quality print A puzzle box that uses four US pennies as part of the locking mechanism. The pennies are meant to be inserted after the print. It will be a tight squeeze, but they should fit. To open, hold the box in one hand and quickly twist your wrist counter-clockwise. Or, set on a flat surface and spin the box in either direction. Demo Video
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