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Down all the way through then set this value to zero. ScrewHoleDiameter = 3; difference() { difference() { 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); cube([cutout_width, cutout_height, thickness+3]); cylinder(h=thickness+standoff_height+3, r=hole_radius, $fn=360); vertex 0 -6 6.59 vertex -2.81683 1.16677 6.59 vertex 3.16429 -1.31069 18.1498 vertex 3.16429 -1.31069 18.1498 facet normal 0.63066 0.768477 0.108216 vertex 4.87024 -3.18104 21.335 facet normal 9.993546e-01 2.758832e-03 3.581708e-02 vertex -9.054786e+01 1.005513e+02 1.080023e+01 facet normal -0.367773 -0.111478 0.923209 facet normal -6.727982e-001 7.398260e-001 0.000000e+000 vertex -4.026420e+000 -3.996321e+000 1.747200e+001 facet normal 0.816085 0.545296 -0.191461 vertex -2.67316 -2.00523 18.2651 facet normal -0.768557 0.63056 0.108238 facet normal 0.687856 0.439084 0.577979 facet normal -0.995185 -0.098015 3.57647e-06 facet normal -3.677672e-001 -6.432549e-001 6.715433e-001 vertex -5.451008e-003 5.862898e+000 2.486861e+001 facet normal -0.499974 -0.86604 1.36818e-05 vertex 2.69039 -1.09142 18.554 facet normal -0.305328 0.0393352 0.951435 facet normal 0.695306 -0.464958 -0.548054 facet normal -0.119235 -0.101837 0.98763 vertex 4.16122 0.0775843 18.7299 vertex 4.28314 0.737827 18.8084 vertex 4.43928 -0.247977 18.7299 vertex 4.15202 -0.0392752 18.7299 facet normal -0.989167 -0.0992487 0.108159 facet normal -0.956923 0.288385 0.0336454 vertex -1.04186 6.43 13.35 vertex 1 6.43 12.85 facet normal -1.258190e-14 -1.000000e+00 -7.920737e-15 facet normal -0.796857 -0.175905 0.577993 vertex 7.24232 0.817766 7.24096 facet normal -2.908023e-001 -2.368297e-003 9.567803e-001 vertex 5.248876e+000 -3.029009e+000 2.493625e+001 facet normal -0.0727789 -0.0673895 -0.995069 vertex -8.08677 -5.87538 0.0420513 facet normal 0.024206 -0.106347 0.994034 facet normal 0.695465 0.464653 -0.548112 facet normal 0.11511 -7.7227e-05 0.993353 facet normal 2.715529e-08 -1.000000e+00 -7.705163e-07 facet normal -0.0819182 -0.0817958 -0.993277 vertex 2.95564 -4.03376 21.7809 facet normal 4.496515e-001 7.868899e-001 4.226319e-001 vertex -3.382837e+000 -3.928930e+000 2.480400e+001 facet normal -0.634342 -0.77296 -0.0119354 vertex 1.61115 -2.41126 19 vertex -2.41126 1.61115 19 vertex 0 -8.99167 3 vertex 8.81889 1.75419 3 vertex -3.44384 -8.30568 3 vertex -8.30722 3.44096 3 vertex -8.30568 3.44384 3 vertex 8.30722 -3.44096 3 vertex -7.48323 -5.00013 3.82299 facet normal -6.013035e-01 -7.990206e-01 3.429106e-04 facet normal -0.828628 0.0822158 0.55373 facet normal 0.499998 -0.866027 1.47826e-06 facet normal -0.382433 -0.0376662 0.923215 vertex -0.0330347 -8.99675 3.82299 facet normal 0.290264 0.956873 -0.0119204 facet normal -0.638759 0.741873 0.203989 facet normal -0.993093 -0.0624835 0.0993093 facet normal -2.537105e-001 4.349549e-001 8.639706e-001 facet normal -0.000107246 -0.115912 0.993259 facet normal 4.561123e-001 -7.804182e-001 4.276787e-001 vertex -5.037910e+000 2.849154e+000 2.476740e+001 facet normal -0.989339 -0.0974657 0.108209 facet normal 0.28858 0.951321 0.108209 vertex -5.71086 -1.13596 21.335 vertex 5.37951 2.22827.

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