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Of "dial" ring (in mm). Larger values for the sake of code complexity. 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 7.10284 6.88658 facet normal -0.0974418 0.989341 0.10821 facet normal 0.466832 -0.877365 0.110898 facet normal 0.0620385 0.077794 -0.995037 facet normal -0.695475 -0.464692 -0.548065 facet normal -0.080194 -0.0189296 0.9966 vertex -7.34398 0 6.86102 vertex 7.34599 0.0206242 6.86125 facet normal -3.767540e-15 -4.271187e-15 1.000000e+00 facet normal 0.630708 0.768445 0.108161 facet normal 0.877362 -0.466839 0.110891 facet normal 0.740031 0.607321 0.288991 vertex 3.4335 8.28921 4.79464 facet normal -0.260332 0.938729 0.225866 facet normal -0.0217758 0.172853 0.984707 vertex -7.39048 -0.139654 6.87554 facet normal -3.536207e-01 9.353889e-01 7.046050e-05 vertex -1.001138e+02 1.055560e+02 4.255000e+01 facet normal -0.0393352 -0.305328 0.951435 facet normal -0.0980333 -0.98848 0.115312 facet normal -0.39254 -0.665267 0.635084 facet normal -4.866830e-001 8.343561e-001 2.588233e-001 vertex 1.673982e+000 -4.913062e+000 2.475471e+001 facet normal 0.103805 -0.261456 0.959617 facet normal -0.977425 0.186455 0.0993766 facet normal 4.225793e-001 1.881470e-003 9.063240e-001 facet normal 5.038511e-001 -8.637906e-001 0.000000e+000 vertex 5.035786e+000 -5.036913e+000 1.747200e+001 facet normal -0.223441 0.736595 -0.638358 vertex 5.54328 2.2961 6.59 vertex -0.4 2.96144 10.597 vertex -0.4 3.00952 6.59 facet normal 0.0974461 -0.989341 0.108206 facet normal 0.705404 0.0127296 0.708692 vertex -7.24232 -0.817766 7.24096 vertex -4.67928 5.62839 7.09583 vertex -5.64771 4.69512 7.09873 facet normal 0.714663 -0.538413 0.446506 facet normal 0.839737 -0.533833 0.0993166 facet normal -0.682453 -0.560081 0.469646 facet normal -2.096573e-001 -3.669004e-001 9.063267e-001 vertex 3.481176e+000 3.944963e+000 2.491820e+001 facet normal -0.243634 0.188037 0.951465 vertex 0.221399 7.2243 6.88859 facet normal 0.286108 0.952732 0.102199 facet normal -0.442038 0.84476 0.301633 vertex 4.30043 -4.59658 7.71246 facet normal -0.634388 -0.773014 -0 vertex -5.91609 -7.41854 6.17308 vertex -7.83991 -5.34516 6.17308 vertex -7.9145 5.54857 3.25404 vertex -7.23142.

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