Point group C4 - Dual extruder

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In crystallography, a point group is a set of symmetry operations that leave a central point fixed while moving other directions and faces to the positions of identical features. These operations include rotations and reflections. A dual-extrusion model uses this concept to create unique structures. The tetragonal cell is one such example. It can be represented in Schoenflies notation as C4, or in Hermann-Mauguin notation as 4. Orbifold notation shows it as 44. Custom cells can be created using OpenSCAD files included with this information. Further details on the topic are available at https://www.staff.ncl.ac.uk/j.p.goss/symmetry/C4.html