2 Piece Cube Puzzle

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The simplest challenge I've ever encountered is this: two identical pieces that form a hollow 30mm cube, yet incredibly tricky to disassemble when you don't know how they fit together perfectly. I've included the puzzle in three different wall thicknesses, each one being uniquely fascinating. The puzzle can be easily scaled up. Print at 0.1 mm or 0.2 mm resolution, either option will yield excellent results. No supports are necessary, and a 15% infill density is ideal for the thicker walled puzzles.