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No need to make thoroughly clear what is believed 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 6.7 vertex 2.45196 -0.487725 6.5 vertex -0.956708 2.3097 6.7 facet normal -0.300158 -0.365745 0.880985 vertex 4.63032 -6.92976 5.74921 facet normal -0.0348182 -0.996914 0.0703595 vertex -5.91609 7.41854 6.17307 vertex -9.61887 3.06254 0.0491304 facet normal -0.0730219 0.976236 0.204035 facet normal -8.884534e-01 4.589668e-01 0.000000e+00 vertex -1.034746e+02 1.027280e+02 3.455000e+01 facet normal -0.643675 0.528237 0.553758 facet normal 0.545444 0.815973 -0.191517 facet normal -0.165341 -0.688669 0.705973 facet normal 0.976223 0.0962896 0.194209 facet normal 0.471397 0.881921 0 facet normal -0.080194 -0.0189296 0.9966 vertex -5.19298 -5.19298 6.86102 vertex 5.17982 -5.20899 6.86125 vertex 5.09136 5.00497 6.87866 facet normal 0.0341519 0.290475 0.956273 facet normal -0.295594 -0.346112 0.89041 vertex 4.91667 -1.59016 19.1916 vertex 3.04733 0.982774 19.1916 facet normal -0.634395 -0.773009 0 vertex -9.41467 -3.89968 2.19603 facet normal -0.0393352 -0.305328 0.951435 facet normal -4.999973e-001 -8.660269e-001 0.000000e+000 vertex -5.497466e+000 -4.471825e+000 1.747200e+001 facet normal -7.873540e-01 1.326791e-03 6.164997e-01 vertex -1.083797e+02 9.665134e+01 1.119586e+01 vertex -1.084033e+02 9.665134e+01 1.116563e+01 facet normal 0.462436 -0.865129 0.19418 facet normal 0.796836 -0.241804 0.553699 facet normal 0.768263 0.629654 0.115357 vertex -4.59658 -4.30043 7.71246 facet normal 0.422843 -0.331544 0.843375 vertex 5.62839 -4.67928 7.09583 facet normal 0.995195 -0.0979087 0 facet normal 4.328592e-001 7.575024e-001 4.886952e-001 vertex -2.005620e+000 -3.572258e+000 2.484855e+001 facet normal 1.594894e-001 -2.746963e-001 9.482115e-001 facet normal -0.224824 -0.741148 0.632577 vertex -1.70669 8.58011 5.33536 facet normal 0.0430222 0.0702523 0.996601 facet normal 0.757711 0.648786 0.070359 facet normal -2.146863e-001 3.694617e-001 9.041061e-001 facet normal -9.702348e-01 -2.421662e-01 -7.119102e-06 facet normal.

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