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The scaling algorithm and parameters to be a negative decimal if you don't want the ring. RingWidth = 0; right_rib_x = width_mm - thickness*2; 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 7.40505 6.86814 facet normal -5.735811e-001 -2.554049e-003 8.191448e-001 facet normal -4.557481e-001 7.833803e-001 4.226214e-001 vertex 7.872627e-001 -5.430288e+000 2.475471e+001 facet normal 1.969464e-14 -1.000000e+00 -9.385756e-14 facet normal -0.421013 -0.192217 0.886454 vertex 4.87063 4.68184 7.03353 facet normal -0.0631152 -0.0760952 0.995101 facet normal -0.255018 -0.430921 0.865606 vertex 0.483852 -6.94062 7.05523 facet normal 2.778119e-02 9.996140e-01 -0.000000e+00 vertex -1.045657e+02 9.849792e+01 2.655000e+01 facet normal -0.545222 0.816125 -0.1915 facet normal 0.749614 0.288986 0.595454 vertex 5.5867 -4.34382 7.39225 facet normal -0.288318 0.956944 0.0336339 facet normal -0.247464 -0.963799 0.099265 vertex -1.49905 7.8583 20 facet normal -0.625114 0.33413 0.7054 facet normal -0.288902 0.952375 0.0975576 vertex -8.33262 -3.38578 4.51215 facet normal 5.000758e-001 -8.579280e-001 1.178287e-001 vertex -4.012485e+000 2.269127e+000 2.467858e+001 facet normal 0.45998 -0.538533 0.705975 facet normal 0.0961675 -0.947172 0.30597 facet normal -0.0559778 -0.885456 0.46134 vertex 5.20841 4.17623 7.5439 facet normal -0.189023 -0.787332 0.586838 facet normal -0.634804 0.772589 0.0114014 facet normal -6.716515e-001 -3.153057e-003 7.408605e-001 vertex 5.147396e+000 -2.971020e+000 2.486861e+001 facet normal -0.0820584 0.0817537 -0.993269 vertex -0.210331 -6.27431 7.81694 facet normal -0.331809 0.353578 0.874577 facet normal 3.036606e-01 9.527803e-01 -7.112507e-05 facet normal 0.956432 -0.291712 -0.0119451 vertex 2.84428 0.565762 19 facet normal -0.301372 -0.0723665 0.950757 facet normal -0.364903 0.547893 0.752767 facet normal 0.900365 -0.42367 0.0992329 facet normal -0.991526 -0.109206 -0.0703586 vertex 7.43617 -6.66225 0.0393247 facet normal -0.995182 0.0973802 0.011361 facet normal 0.652502 0.754513 -0.0703644 vertex 2.04142 9.63313 1.42382 vertex 2.0132 -9.30698 4.65942 facet normal 0.55473 -0.0546198 0.830236 facet normal -0.0950617 0.0292285 0.995042 vertex 7.443 -2.94689 19.9485 facet normal 0.00758102 -0.10117 -0.99484 facet normal 0.631387 0.769304 0.0975749 vertex -7.48323 -5.00013 3.82299 facet normal 0.0363615 -0.0926478 -0.995035 facet normal -6.716636e-001 -2.828501e-003 7.408509e-001 vertex 5.143733e+000 2.946636e+000 2.488918e+001 facet normal -0.081619 0.828696 0.553716 vertex 0.344109 9.92995 2.94279 vertex 1.94385 9.77239 2.94279 facet normal 3.385610e-001 -5.800993e-001 7.408517e-001 facet normal -0.90036 -0.423683 0.0992177 vertex -7.01045 3.85403 20 facet normal -0.622313 -0.758301 0.19418 facet normal 0.471711 0.881672 -0.0119957 facet normal -0.233255 0.849615 0.473018 facet normal -0.945995 0.308563 0.0994105 facet normal -7.266487e-01 -6.870092e-01 0.000000e+00 vertex -9.020292e+01 9.930476e+01 1.855000e+01 vertex -1.027476e+02 1.036941e+02 1.855000e+01 vertex -9.289982e+01 1.045249e+02 1.055000e+01 vertex.

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