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Held to be even. Odd values are -=1 difference() { union() { cube([board_width, board_height, thickness]); cylinder(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 6.5 vertex -1.38893 2.07867 6.7 vertex 2.45196 0.487725 6.7 vertex 2.45196 0.487725 6.7 vertex 1.38893 -2.07867 6.7 vertex 1.76777 1.76777 6.5 facet normal -0.290292 -0.950491 0.11089 facet normal 0.591982 0.205712 0.779256 facet normal -0.0819649 -0.0819028 -0.993264 vertex 3.43619 3.13874 21.7467 facet normal -0.634846 -0.772555 0.0113566 vertex -5.7853 -4.29641 7.81019 facet normal 0.382444 -0.0376652 0.923211 facet normal 8.660254e-01 5.000000e-01 0.000000e+00 facet normal -0.0463745 -0.470877 0.880979 vertex 8.33435 0 5.74921 facet normal -4.711469e-001 8.098499e-001 3.495192e-001 vertex 6.298102e-001 -4.344231e+000 2.475471e+001 facet normal 0.703596 -0.707109 0.0703594 facet normal -0.48503 0.124395 0.865605 facet normal 0.603866 0.370049 0.705981 facet normal 0.816085 0.545296 -0.191461 vertex -2.67316 -2.00523 18.2651 facet normal -0.634511 0.772914 0 facet normal -0.103782 0.261482 0.959613 facet normal -0.816006 -0.545394 -0.191519 facet normal 0.30557 -0.114495 0.945261 facet normal 0.081813 0.0823699 0.993238 vertex.

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