Point group D3d - Dual extruder

thingiverse

In crystallography, a set of symmetry operations known as crystallographic point groups leaves a central point fixed while moving other directions and faces of the crystal to positions that mirror features of the same kind. https://en.wikipedia.org/wiki/Crystallographic_point_group This model employs a dual-extrusion approach. It features a trigonal cell structure. The Schoenflies notation is D3d, Hermann–Mauguin notation is −3m, Orbifold notation is 2*3. OpenSCAD files are included to enable customization of the cells. Further details can be found at: https://www.staff.ncl.ac.uk/j.p.goss/symmetry/D3d.html