Chiasma puzzle
thingiverse
This is a brain teaser by Yavuz Demirhan from Turkey, typically crafted from metal. Its simplicity belies its complexity - disassembling and reassembling it requires great skill. I appreciate this puzzle's ability to maintain the thrill of discovery even when all pieces are visible separately. To enjoy it fully, simply print out four identical copies and you're set. Thin prints work just fine, but thicker ones may need sanding to achieve the perfect thickness. Scaling up seems like a natural next step, although I haven't attempted it yet.
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