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20mm in diameter at the center, then to point at the circumference of the rail + a safety margin // margins from edges h_margin = hole_dist_side + thickness; v_margin = hole_dist_top*2 + thickness; v_margin = hole_dist_top*2; v_margin = hole_dist_top*2 + thickness; width_mm = hp_mm(h); } else { rotate_extrude(convexity=10, $fn=fn4) polygon(points=[ [x0,y0],[x1,y0],[x1,y1],[x2,y2], [x2,y3],[x1,y4],[x1,y5],[x0,y5] ], paths=[ [0,1,2,3,4,5,6,7] ]); } } 0 0 vertex 5.31736 8.65691 0 vertex 6.29579 -1.61648 19.9323 facet normal 0.499998 -0.866027 1.12546e-07 facet normal 0.952375 0.288902 0.0975576 vertex 3.38578 -8.33262 4.51215 facet normal -0.422843 0.331544 0.843375 facet normal -4.633145e-001 -8.124056e-001 3.540293e-001 vertex -4.082628e-003 4.627842e+000 2.476740e+001 facet normal 9.987861e-001 4.447341e-003 4.905725e-002 facet normal 0.189046 0.78732 0.586847 vertex 3.69467 -2.36877 19.9 vertex -6.29579 -1.61648 19.9 facet normal -5.281296e-01 0.000000e+00 8.491638e-01 vertex -1.043265e+02 9.725134e+01 7.312023e+00 facet normal 7.808552e-001 3.476637e-003.

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