Three Piece Interlocking Tetrahedron Puzzle (Stewart Coffin)

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This is a straightforward three-piece puzzle inspired by Stewart Coffin's design. However, the solution turns out to be unexpectedly challenging, making it more difficult than its simple parts count would lead you to believe. I incorporated an extra .2mm of clearance, but one can easily adjust this value in the provided Openscad file. Unfortunately, I didn't create a parametric version, so if you want to change the clearance, you'll need to alter every instance of ".9" in the code.