Point group D3d - Dual extruder
thingiverse
"In crystallography, a crystallographic point group is a set of symmetry operations, like rotations or reflections, that leave a central point fixed while moving other directions and faces of the crystal to the positions of features of the same kind." https://en.wikipedia.org/wiki/Crystallographic_point_group This is a dual-extrusion model. Trigonal cell. Schoenflies notation: D3d Hermann–Mauguin notation: −3m Orbifold: 2*3 OpenSCAD files included to make custom cells. Further information: https://www.staff.ncl.ac.uk/j.p.goss/symmetry/D3d.html
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