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Draw panel, subtract holes 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 -5.48271 21.8439 facet normal 0.115847 -6.62301e-05 -0.993267 vertex -0.996058 -6.9148 7.89166 facet normal 0.952376 -0.288896 0.0975692 vertex 1.81418 8.80936 4.51215 facet normal -4.203270e-16 -1.856182e-15 -1.000000e+00 facet normal 0.0243197 0.30898 0.950758 facet normal 0.368125 -0.929776 0 facet normal -0.00722651 0.0990124 0.99506 facet normal 0.255018 0.430921 0.865606 vertex -6.94062 -0.483852 7.05523 facet normal 4.566412e-001 -7.828545e-001 4.226318e-001 vertex -3.417320e+000 3.815345e+000 2.480400e+001 facet normal 0.828697 0.0816152 0.553715 facet normal 0.768512 0.63062 0.108202 facet normal 0.555567 -0.831471 1.34063e-06 facet normal -0.422682 0.361949 0.830862 vertex -5.54018 -4.83492 6.98312 facet normal 9.349039e-001 -3.549011e-001 0.000000e+000 vertex -5.033025e+000 -4.995401e+000 1.747200e+001 facet normal 0.0464242 -0.0868533 0.995139 vertex 7.3758 -1.46714 6.0001 facet normal -3.817308e-001 9.242736e-001 0.000000e+000 vertex 7.068955e+000 -6.845815e-001 2.496000e+001 vertex -5.777357e+000 4.011096e+000 1.747200e+001 facet normal -0.587092 -0.0461938 0.808201 vertex 6.08133 1.22155 19.4867 vertex 5.50469 2.16809 19.8418 facet normal 0.262766 -0.491602 0.83023 facet normal 0.115822 -2.37262e-05 -0.99327 vertex 4.64918 -0.210331 21.7467 facet normal -0.343415 0.685181 0.642334 vertex -4.46869 4.91993 7.17054 facet normal 0.991524 -0.109221 0.0703601 vertex -6.36501 -7.83508 0.0491304 facet normal 0.0635213 -0.807211 0.586836 vertex 4.46118 2.47079 19.9 vertex -6.29579 -1.61648 19.9 facet normal -0.241717 0.79685.

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