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Master Tutt’s Icosaminx is a corner turning icosahedron consisting of four-layers of regular triangles of identical size. As shown in YouTube video below, this set consists of totally 147 pieces (1 core piece, 3 sets of 12 corner pieces, 30 edge pieces, 60 internal pieces, and 20 center pieces). In addition, two sets of 12 screws (length 12 to 18 mm, thick one; length 25 to 30 mm, M3) are needed. Stickers can be modified from those for 4x4x4 cube (each width 13.5mm).
Unlike my other puzzles, this is not a modification of another puzzle, while I used Megaminx core in YouTube video. You do NOT need megaminx.
Height after assembly: 102 mm
length of each regular triangle face: 66 mm