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A Halpern-Meier-Tetrahedron with the same constraints as the constrained cube.
This is a redesigned Halpern-Meier-Tetrahedron (the non-pillowed cousin of the namegiving Jing's Pyraminx) with constraints on all four axes. These constraints allow only 120° turns. Puzzle is the same size as an average pyraminx.
Edge length: 87 mm
In 2020 the inventor redesigned the puzzle including a DIY kit with four different pieces of each triangular piece.
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