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Subtract holes union() { difference() { difference() { difference() { union() { cube([board_width, board_height, thickness]); cylinder(thickness+standoff_height, r=standoff_radius, $fn=360); cylinder(h=thickness+standoff_height, r=standoff_radius, $fn=360); cube([cutout_width, cutout_height, thickness+3]); cylinder(h=thickness+standoff_height+3, r=hole_radius, $fn=360); vertex 0 -2.5 6.7 vertex 2.45196 -0.487725 6.5 vertex 0.956708 -2.3097 6.5 vertex 2.5 0 6.5 vertex -0.487725 -2.45196 6.7 vertex 2.45196 0.487725 6.5 facet normal -0.773012.

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