4 Key Coin Box Puzzle
thingiverse
This was inspired by a Mini Lock Box Puzzle by CrazyBlackStone [https://www.thingiverse.com/thing:4606970] At first I wanted to incorporate a box to put in a surprise for my grandchildren when they opened it so I designed the 4 Key Surprise Box Puzzle. [https://www.thingiverse.com/thing:4722883] The top part had a neat void between the locks and I made sure that it was big enough to hold a small coin (such as a UK £1) so it seemed sensible to redesign the surprise box puzzle into this so that the box can be omitted.
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