The acronym VNF stands for Vertices 'N' Faces. You have probably already come across the concept of vertices and faces when working with the OpenSCAD built-in module polyhedron(). A polyhedron() in it ...
Note that the first expected argument to xcopies() is the spacing argument, so you do not need to supply the spacing= argument name. Similarly, ycopies() makes a line of evenly spaced copies centered ...
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