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This 3D printed puzzle is one of my most complex and lovely designs.
It takes thirteen steps before the first piece comes free. The 'switch' is flicked at step 5. When reassembling the puzzle, it may be easier to slide the switch piece with a pair of tweezers or a small pointy thing. One of the steps in the solution is a rotation, which makes it harder for computer programs like Burr Tools to find the solution.
This 6 cm solid version has been provided by request. It can be dyed in a variety of colours.