Point group S4 - Dual extruder
thingiverse
In crystallography, a crystallographic point group is a collection of symmetry operations that leave a central reference point intact while moving other directions and faces of the crystal into the positions of identical features. This is a dual-extrusion model based on a tetragonal cell. The Schoenflies notation for this group is S4, and its Hermann-Mauguin notation is -4. OpenSCAD files are included to create custom cells. For more information, visit https://www.staff.ncl.ac.uk/j.p.goss/symmetry/S4.html
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