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Zero. ScrewHoleDiameter = 3; 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 8.88682 5.07603 facet normal -3.873393e-15 -1.000000e+00 4.657429e-14 vertex -1.065156e+02 9.725134e+01 1.020829e+01 facet normal -3.779527e-001 6.475934e-001 6.616453e-001 facet normal 0.0974657 -0.989339 0.108209 facet normal 0.103805 -0.261456 0.959617 facet normal 0.796836 0.241804 0.553699 facet normal -0.629624 0.768293 0.115323 vertex -4.6286 0 21.7443 facet normal 1.304262e-001 -2.235998e-001 9.659152e-001 facet normal -0.989318 -0.097633 0.108249 facet normal -0.0973878 0.989349 0.108188 facet normal -5.312582e-14 -1.000000e+00 1.314904e-16 facet normal -0.991524 0.109224 -0.0703593 vertex 4.76941 -8.07987 6.03331 facet normal -0.012304 -0.156322 0.987629 vertex 5.11046 0.230843 18.8084 vertex 4.64798 0.0392752 18.7299 vertex 4.25243 0.203118 18.7299 vertex 4.32242 0.23878 18.7299 facet normal -0.0729369 -0.0676723 -0.995038 facet normal 7.070963e-001 3.148239e-003 7.071103e-001 vertex -7.435241e-001 -5.517328e+000 2.488700e+001 facet normal -0.00384412 -0.367707 0.929934 facet normal 0.630636 0.768498 0.108209 facet normal 9.807815e-01 1.951068e-01 1.022917e-03 vertex -1.043966e+02 9.730070e+01 3.455000e+01 facet normal -0.772937 0.634483 0 facet normal -0.0925097 0.0580283 0.994019 facet normal -0.466811 -0.877371 0.110936 facet normal 0.0974293 0.989343 0.108203 facet normal.

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