Point group D4 - Dual extruder

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In crystallography, a crystallographic point group is a collection of symmetry operations that includes rotations and reflections. These operations fix a central point while moving other directions and faces of the crystal to positions corresponding to features of the same type. A dual-extrusion model utilizes this concept. The model's tetragonal cell is defined by its Schoenflies notation: D4, indicating it possesses four-fold rotational symmetry. In addition, the Hermann-Mauguin notation, 422, further describes the crystallographic point group, specifying the presence of three two-fold axes and a four-fold axis. The orbifold notation, 422, provides an alternative representation of this crystallographic point group. OpenSCAD files are provided to facilitate the creation of custom cells based on this model. For more information, refer to the website: https://www.staff.ncl.ac.uk/j.p.goss/symmetry/D4.html