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Even. Odd values are -=1 difference() { 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 facet normal 0.952732 -0.286108 0.102199 facet normal 0.0737341 0.0668214 0.995037 facet normal 0.0729258 -0.976256 0.203976 facet normal -0.368125 -0.929776 0 vertex 5.69599 -3.1314 19.9 vertex 6.1206 1.7206 19.8418 facet normal -2.727310e-001 -9.620903e-001 0.000000e+000 vertex -3.765772e+000 5.933461e+000 2.496000e+001 vertex -4.919635e+000 2.734702e+000 1.747200e+001 facet normal -0.305328 -0.0393352 0.951435 facet normal 0.956715 -0.0766184 0.280761 facet normal 0.665267 -0.39254 0.635084 facet normal 0.768483 -0.630654 0.108209 facet normal 0.946346 -0.307482 0.0994132 facet normal 8.314602e-01 5.555843e-01 -0.000000e+00 facet normal -4.56308e-05 0.115797 0.993273 facet normal 0.453753 0.0357191 0.890411 facet normal -0.36633 0.925211 0.0989244 facet normal 2.167753e-001 -9.762215e-001 0.000000e+000 vertex -8.646397e+000 4.992000e+000 0.000000e+000 vertex 6.277050e+000 -3.351948e+000 2.496000e+001 vertex 6.528279e+000 2.738236e+000 1.747200e+001 facet normal -0.665695 0.586529 0.46134 facet normal -0.834578 -0.268415 0.481075 facet normal 0.0975625 -0.989331 0.108193 facet normal -0.491592 0.262761 0.830237 facet normal 0.552322 -0.106057 -0.826857 vertex -2.9008 0 18.9335 facet normal 0.528262 -0.643692 0.553714 facet normal 0.183013 0.980589 0.0703596 facet normal 0.678289 0.205786 0.705391 facet normal -0.000246232 0.11537 0.993323 vertex 0.41258 -6.33525 7.82405 facet normal -0.0980056 0.995115 -0.0118632 facet normal 8.671287e-01 1.144891e-03 -4.980829e-01 vertex -1.052761e+02 9.695134e+01 1.058658e+01 facet normal 0.980977 0.194125 -4.03034e-07 vertex 1.2887 -3.16866 6.59 facet normal -1.951069e-01 9.807820e-01 -4.830280e-05 facet normal 0.993074 0.0629615 0.0991953 facet normal -0.634388 -0.773014 0 vertex 8.22545 5.96308 0 facet normal -9.901917e-001 1.397156e-001 0.000000e+000 vertex -5.241066e+000 -2.130983e+000 9.983999e+000 vertex 5.854357e+000 3.963141e+000 9.983999e+000 vertex -4.781955e+000 -5.239326e+000 1.747200e+001 facet normal -5.035381e-001 -2.241926e-003 8.639701e-001 facet normal -0.737729 -0.601759 0.30601 facet normal -8.289299e-01 1.083016e-03 5.593514e-01 vertex -1.083973e+02 9.695134e+01 1.117392e+01 facet normal 0.368125 -0.929776 0 facet normal -0.0816152 0.828697 0.553715 facet normal -0.262733 0.257269 0.929938 facet normal 0.0823401 0.0817408 0.993246 vertex 4.18518 5.59382 7.89166 vertex -6.91658 0.991719 7.89187 facet normal -0.988483 0.0979878 0.115323 vertex 3.27291 3.27291 21.7443 facet normal -7.748049e-001 6.322004e-001 0.000000e+000 vertex -4.781955e+000 -5.239326e+000 9.983999e+000 vertex -4.245195e+000 -5.688466e+000 9.983999e+000 vertex -2.690832e+000 -5.005927e+000 1.747200e+001 facet normal 1.144282e-15 5.425988e-16 -1.000000e+00 facet normal -0.0357185 0.453753 0.890411 vertex 3.23535 0.378418 18.9636 vertex 4.28314 -0.737827 18.8084 vertex 3.68954 -0.230843 18.8084 facet normal 9.969322e-01 7.826654e-02 -6.755265e-04 vertex -9.023081e+01 9.815134e+01 1.755000e+01 facet normal 2.077796e-01 -3.727553e-03 -9.781686e-01 vertex -1.059234e+02 9.695134e+01 1.027243e+01 facet normal 0.0376634 0.382434 0.923215 vertex -8.90914 -0.922563 3.82299 vertex -8.26214 -3.54289 3.82299 facet normal -0.630656 -0.76848 0.108218 facet normal 0.0694748 -0.705391 0.705406 facet normal 0.630636 -0.768498 0.108209 facet normal -0.748167 -0.309905 0.58669 facet normal -0.115483 6.60207e-05 0.993309 facet normal.

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