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Handle + rest of the rail + a safety margin // margins from edges v_margin = hole_dist_top*2 + thickness; width_mm = hp_mm(h); difference() { difference() { union() { 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 -1.32743 -3.1531 18.1498 facet normal -0.459965 -0.538537 0.705981 facet normal 0.125632 0.98709 0.0993499 vertex 1.87381 -9.82287 0 facet normal -0.695391 -0.464642 -0.548215 vertex 2.63805 1.98496 18.4724 facet normal -0.0942732 0.0305836 0.995076 vertex 7.75254 1.99375 19.95 facet normal -0.284751 -0.938727 0.194185 facet normal 0.0822176 -0.0560551 -0.995037 facet normal -0.952376 0.288896 0.0975692 vertex -1.81418 -8.80936 4.51215 facet normal -0.645449 -0.129422 0.752759 vertex -5.2499 4.56563 7.05523 facet normal 1.087067e-001 4.840002e-004 9.940737e-001 vertex -1.365947e+000 -4.108084e+000 2.495526e+001 facet normal -0.48977 -0.507679 0.708793 facet normal 0.47101 -0.882048 -0.0118783 facet normal -0.261456 0.103805 0.959617 vertex -4.97711 4.83683 6.93683 vertex 4.90011 -4.90011 6.9357 vertex 4.87063 4.68184 7.03353 facet normal -9.996062e-01 -2.806048e-02 -2.699214e-04 facet normal -6.696355e-01 3.723880e-03 -7.426806e-01 vertex -1.083707e+02 9.695134e+01 1.051604e+01 facet normal 0.382438 0.0376556 0.923213 facet normal -3.562733e-001 6.107859e-001 7.071138e-001 vertex 1.720656e+000 -4.993079e+000 2.488700e+001 facet normal -0.682997 -0.618219 0.388999 facet normal 0.44206 -0.844738 0.301663 facet normal -2.632024e-15 -1.000000e+00 -9.989974e-15 facet normal 0.734381 -0.392549 0.553705 facet normal 0.77078 0.0759133 0.632562 vertex 1.70669 8.58011 5.33536 facet normal -0.471401 -0.881919 1.54281e-06 facet normal 0.0807235 -0.0825634 0.993311 vertex -4.28775 -5.77664 7.9152 facet normal -0.0915932 0.0112271 0.995733 facet normal 0.097551 -0.990437 0.0975617 facet normal 0.603866 -0.370049 0.705981 facet normal 0.433637 0.161777 0.886446 vertex 0.133493 -6.75462 7.03353 facet normal 0.768263 0.629654 0.115357 vertex -4.30043 4.59658 7.71246 facet normal 6.903770e-01 8.143624e-05 7.234498e-01 facet normal 0.956941 -0.290281 1.92409e-06 facet normal 0.29034 0.956924 -9.5392e-07 facet normal -5.418452e-01 -6.316620e-03 8.404546e-01 facet normal 5.735753e-001 3.754522e-003 8.191442e-001 vertex -5.148046e+000 -2.117684e+000 2.491820e+001 facet normal 0.678283 -0.205751 0.705407 vertex 9.09213 3.43962 3.26879 vertex 3.72964 -9.00415 3.26879 vertex -6.85323 -6.50317 3.54602 vertex -8.35972 -3.66179 3.76384 vertex -6.85323 6.50317 3.54602 vertex -5.26058 -7.87301 3.54602 vertex -9.55875 -1.90135 3.26879 vertex 3.813 -9.20539 2.94279 facet normal -0.956969 -0.290189 -5.37408e-06 facet normal -0.0623612 -0.633165.

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