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To build up seven rows; middle one unused row_1 = v_margin+12; // 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 7.79364 5.97318 facet normal -2.593997e-001 4.439971e-001 8.576586e-001 facet normal -0.0865373 -0.878615 0.469624 vertex -8.88682 0 5.07603 vertex 8.71606 1.73373 5.07603 facet normal -0.235679 0.201291 0.950756 vertex 5.26591 -0.865913 18.9636 facet normal -7.614451e-01 5.127838e-01 3.965528e-01 vertex -1.095272e+02 1.011513e+02 1.561034e+01 facet normal 0.241727 0.796857 0.553703 facet normal 0.451284 -0.844291 0.288991 vertex 6.34429 6.34429 4.79464 facet normal -0.7808 -0.129508 0.611211 vertex 4.41978 5.40021 7.20613 facet normal 0.237818 -0.388083 0.890412 facet normal 2.096561e-001 3.668986e-001 9.063276e-001 vertex -4.330786e+000 -3.518775e+000 2.491820e+001 facet normal 0.538408 -0.714673 0.446497 facet normal -4.999979e-001 -8.660266e-001 0.000000e+000 vertex -1.168555e+000 6.931669e+000 2.496000e+001 vertex 2.937280e+000 6.404036e+000 9.983999e+000 vertex 1.269793e+000 6.921616e+000 9.983999e+000 vertex 6.528279e+000 2.738236e+000 1.747200e+001 facet normal -0.528246 0.643673 0.553752 facet normal 0.388724 0.815359 0.429049 facet normal 0.991524 0.109217 0.0703647 facet normal 0.634395 0.773009 -0 facet normal -6.821237e-01 7.312368e-01 1.425847e-04 vertex -9.262627e+01 1.042954e+02 4.255000e+01 facet normal 3.103493e-01 3.586279e-03 -9.506158e-01 vertex -1.083010e+02 9.725134e+01 1.270173e+01 facet normal -0 0.707116 0.707098 facet normal -0.0906197 -0.920082 0.381101 facet normal -0.633162 0.0623602 0.771503 facet normal 4.792334e-001 8.386592e-001 2.588168e-001 facet normal 8.560691e-01 -6.853637e-03 5.168160e-01 vertex -1.091212e+02 9.695134e+01 9.696443e+00 facet normal 0.991507 -0.0942884 0.0895734 facet normal 0.768445 -0.630708 0.108161 facet normal 0.954699 0.292521 0.0546087 facet normal 0.421013 0.192217 0.886454 vertex 4.68184 -4.87063 7.03353 facet normal -0.634395 -0.773009 0 vertex -2.3097 -0.956708 6.5 vertex 0 -7.79364.

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