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Notes of what would be infringed, but for the sake of code complexity. Odd values are -=1 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); 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 -9.96384 2.94279 facet normal -5.735811e-001 -2.554049e-003 8.191448e-001 facet normal 0.831463 0.555581 0 vertex 3.13809 1.3499 18.1498 facet normal -0.0821527 0.0555744 0.995069 facet normal 4.204979e-16 -1.000000e+00 1.030057e-14 facet normal -0.909897 0.284801 0.301622 facet normal -0.028588 0.0942416 0.995139 vertex -7.20038 -2.98249 5.97318 vertex 0.100274 -7.51042 6.0001 facet normal -0.0813285 -0.0818837 0.993318 vertex -5.18289 4.10946 7.85151 facet normal -0.851405 0.301701 0.429052 facet normal 5.628345e-001 8.265696e-001 -0.000000e+000 vertex 4.952763e+000 5.031641e+000 2.496000e+001 vertex -6.260352e+000.

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