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).
Each piece is cut in half so that no supports are needed. Print 2 copies of TetraPiece, 2 copies of TetraPieceMirror and 4 copies of the (half) Upiece. I recommend a layer height of 0.15 mm or smaller for good sphere resolution.
IMPORTANT: All pieces are under stress during assembly and I recommend strengthening their joints. This is most easily done by increasing the number of perimeters. I recommend 4 perimeters.
The halves are then glued together with superglue. Each piece contains holes for alignment. After cleaning the holes out (if necessary) take a scrap piece of 1.75 mm filament. Insert the filament into a hole and cut it off such that about 3 mm is sticking out. After each hole has a piece of filament, fit the other half in place. If the fit looks good, remove and glue the halves together.
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