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BackKnob working_width = width_mm - thickness*2; 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); 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 2.9 19 vertex -1.61115 -2.41126 19 vertex 2.41126 -1.61115 19 vertex 0 3.04892 6.59 vertex 5.88471 1.17054 6.59 facet normal -0.60388 -0.370041 0.705973 facet normal 9.784889e-17 -5.803989e-16 -1.000000e+00 facet normal 0.442581 0.106258 0.890411 facet normal -0.0816481 -0.828735 0.553653 facet normal 4.877140e-001 -8.337538e-001 2.588236e-001 vertex -4.285366e+000 3.266107e+000 2.470218e+001 facet normal -8.506957e-01 -1.781115e-03 5.256555e-01 facet normal -0.000195511 0.116119 0.993235 facet normal 0.191474 0.962647 -0.191437 vertex -0.4 -2.96144 10.597 vertex 0.4 -2.86172 18.9065 facet normal -0.695465 -0.464653 -0.548112 facet normal 0.291196 -0.188081 0.937993 facet normal 0.63014 0.772994 0.0735165 vertex 6.72966 0.896427 7.87006 vertex -6.73225 0.892525 7.87036 facet normal -0.0974461 0.989341 0.108206 facet normal 8.379958e-001 5.456766e-001 0.000000e+000 facet normal -0.463913 0.883082 -0.070359 vertex 9.83901 1.66324 0.0388355 facet normal -4.803516e-01 -8.770760e-01 -3.417321e-04 vertex -1.006624e+02 1.053036e+02 2.550000e+00 facet normal -0.993001 0.0642719 0.0990887 facet normal 0.0816302 0.828702 0.553705 facet normal -0.633165 -0.0623605 0.771501 facet normal 0.630653 0.768481 0.10823 facet normal -0.338921 -0.181155 0.923209 vertex 7.50438 -4.96057 3.82299 facet normal -0.499981 -0.866036 -2.49143e-05 facet normal 0.976261 0.0729941 0.203926 vertex 7.21514 -1.03118 7.67586 vertex -4.38745 -5.82788 7.61242 facet normal -0.0973802 0.995182 0.011361 facet normal 0.273132 0.564081 0.779238 facet normal 0.528267 -0.64375 0.553643 facet normal 0.45399 -0.891007 0 facet normal 0.607321 -0.740031 0.288991 vertex 6.34429 6.34429 4.79464 facet normal -0.247458 0.963792 0.0993427 facet normal -4.323857e-002 -7.566741e-002 9.961952e-001 vertex 4.422983e+000 3.524060e+000 2.495526e+001 facet normal -0.0979087 -0.995195 -0 facet normal 0.630673 0.768469 0.108201 facet normal -0.683075 -0.61809 0.389067 vertex 5.79165 4.46475 7.41914 facet normal -0.0914036 -0.463056.
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