Point group D3 - Dual extruder

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In crystallography, a crystallographic point group represents a collection of symmetry operations, such as rotations and reflections, that preserve a central point while moving other directions and faces of the crystal to equivalent positions. This is a dual-extrusion model that utilizes a trigonal cell. The Schoenflies notation for this group is D3, which corresponds to the Hermann-Mauguin notation 32 or the orbifold notation 322. OpenSCAD files are included to facilitate creation of custom cells. Additional information can be found at https://www.staff.ncl.ac.uk/j.p.goss/symmetry/D3.html