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Indentations, you way want to make fitting inside a case easier. Or 10mm if it faces away and so on. // body - hole // begin arrow top cutout cylinder(r=8, h=10, $fn=3, center=true); for (z = [0:sphere_number_of_indentations] for (z = [0:sphere_number_of_indentations] for (z = [0 : sphere_indents_count]) { z_position = sphere_indents_radius + (enable_stem ? Stem_height : 0) + knob_height - sphere_indents_cutdepth; for (z = [0.

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