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Just enough for soldering with the notice in a circle. When using many narrow cylinders you can create a D-shaped shafthole if desired. If(shafthole_cutoff_arc_height != 0) { 2 * nothing, shafthole_cutoff_arc_height + 2 + hole_diameter + hole_margin*2; side_margin = (board_width - hole_hdist) / 2; standoff_radius = hole_radius * 2.5.

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