I love the design of VastaAesthetics's low-poly ring, but am looking for an easier way to customize it for different sizes and thicknesses. This design implements a customizer using an scad file.

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In slicer, use "Print thin walls" setting for smoother tops and bottoms.
Make ring as detailed as you wish for layer height. Uses almost no filament and prints quickly either way. No raft, support, or other special features except print thin walls.