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Y-U Tetrahedron Puzzle

Y-U Tetrahedron Puzzle

cults3d

A ball tetrahedron puzzle which interlocks. Remarkably, it is also made from pieces which look like Y and U! The pieces must flex slightly as they go together, so PLA should not be used. The model in the photos is made from PETG and works great. Around 2005, Viktor Genel invented a puzzle he called "Octetra". This puzzle has 6 pieces, one can assemble 4 pieces into an Octahedron (Y-U Octahedron) or assemble 4 other pieces into a Tetrahedron (this puzzle).

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