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System, which is a little bit of margin } module rail(height) { difference() { 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); 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 -7.13321 6.87796 facet normal -8.833904e-01 3.470973e-03 -4.686249e-01 vertex -1.044231e+02 9.695134e+01 1.188058e+01 facet normal -2.862063e-01 2.896355e-03 -9.581636e-01 vertex -1.057085e+02 9.725134e+01 1.281102e+01 facet normal -1.947994e-15 7.133640e-17 -1.000000e+00 facet normal -0.000000e+00 -1.000000e+00 facet normal 0.479403 0.871958 0.0993087 facet normal 0.622304 -0.730693 0.280758 facet normal 0.768363 0.630808 0.108162 facet normal 0.0766184 0.956715 0.280761 facet normal -0.447818 0.382464 0.808196 vertex 5.58228 -1.18228 19.1916 facet normal -4.675287e-001 -8.173038e-001 3.367959e-001 vertex -5.049778e-003 5.772892e+000 2.473857e+001 facet normal -7.590611e-01 6.510193e-01 1.611977e-04 vertex -9.205704e+01 1.037341e+02 4.255000e+01 facet normal -0.245613 0.96426 0.0993777 vertex 2.85317 0.927051 0 vertex -7.20568 -7.20568 0 facet normal 0.156321 -0.0122986 0.98763 facet normal 0.189023 -0.787332 0.586838 vertex 5.10533 -2.36877 19.9 vertex 4.7383 4.44956 19.9 facet normal -0.258274 -0.111484 0.959618 facet normal -0.486762 -0.388502 0.782387 facet normal 0.630641 -0.76849 0.108235 facet normal 0.695465 0.464653 -0.548112 facet normal -0.840151 0.533195 0.0992474 vertex -8.09017 -5.87785 0 facet normal -0.15247 -0.036616 0.98763 vertex 4.1763 0.113982 18.7299 facet normal 0.39254 0.734385 0.553707 facet normal 9.593087e-01 -2.495751e-03 -2.823485e-01 facet normal -0.772501 -0.634912 0.0113542 vertex -4.13938 4.98277 7.73103 facet normal 0.947349 -0.304504 0.0990356 facet normal -0.286094 -0.952737 0.102192 facet normal -2.593997e-001 4.439971e-001 8.576586e-001 facet normal -0.247463 0.9638 0.099258 vertex -3.09017 9.51056 0 facet normal 4.566411e-001 -7.828546e-001 4.226318e-001 vertex -3.417320e+000 3.815345e+000 2.480400e+001 facet normal 0.488315 0.595017 -0.63836 facet normal -0.980847 -0.194778 5.41595e-08 vertex 3.16821 1.29095 18.1498 facet normal -5.393361e-002 -9.438384e-002 9.940739e-001 vertex 1.399291e+000 4.041589e+000 2.495526e+001 facet normal -0.758285 -0.622326 0.194199 facet normal 0.471352 0.881864 -0.0120147 facet normal 0.083183 -0.0810354 0.993234 vertex 5.83003 -4.3315 7.92322 facet normal 3.573127e-07 -1.000000e+00 -5.943996e-07 facet normal 0.172865 -0.0218118 0.984704 facet normal -0.0922853 -0.0580967 0.994036 facet normal -0.900355 0.423665 0.0993365 vertex -8.76307 4.81754 0 facet normal -8.092068e-01 1.300217e-03 -5.875224e-01 vertex -1.076659e+02 9.715134e+01 5.903821e+00 facet normal 0.288339 0.956937 0.0336393 facet normal -0.459965 0.538537 0.705982 facet normal -0.706045 0.0555529 0.705985 facet normal -0.284755 -0.938725 0.194192.

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