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Is believed to be even for the sake of code complexity. Odd values are -=1 } module rail(height) { difference() { // slider pot slit // make a hole with radius: ", hole_r , " at ", width_mm - thickness; left_panel_width = 12*3 + tolerance*2; //three knobs plus space between them right_panel_width = width_mm - thickness*2; 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 -2.5 6.7 vertex 2.5 0 6.7 vertex 2.3097 0.956708 6.7 vertex 2.3097 0.956708 6.7 vertex -1.76777 -1.76777 6.5 facet normal -0.768293 -0.629624 0.115323 vertex -4.6286 0 21.7443 facet normal -0.0943136 -0.991505 0.0895749 facet normal 0.0822199 -0.0560555 -0.995037 vertex -9.9163 1.25272 0.048847 facet normal 0.554793 0.0426235 0.830896 vertex 7.3363 -0.49869 6.98312 vertex 5.5107 4.61666 7.08096 facet normal 9.682993e-01 2.497929e-01 -2.366477e-04 facet normal 4.849723e-01 -7.073257e-03 8.745009e-01 vertex -1.084793e+02 9.695134e+01 9.130643e+00 facet normal -9.653280e-01 2.610399e-01 2.267875e-04 vertex -1.043771e+02 1.005852e+02 4.255000e+01 facet normal -0.188007 -0.291191 0.938009 vertex 4.97515 5.38424 6.90036 facet normal 0.946342 -0.307486 0.0994494 facet normal -0.989341 -0.0974418 0.108212 facet normal -0.622316 -0.758298 0.194183 facet normal -0.471393 0.881923 2.62504e-06 facet normal 3.103493e-01 -3.586279e-03 -9.506158e-01 vertex -1.081708e+02 9.725134e+01 1.274423e+01 vertex -1.083010e+02 9.725134e+01 1.270173e+01 facet normal 0.049906 0.0857116 0.995069 vertex -6.83882 4.66263 19.9688 facet normal -2.588515e-001 -1.152617e-003 9.659165e-001 facet normal -0.38808 -0.237822 0.890413 facet normal -0.749614 -0.288986 0.595454 facet normal 0.183013 -0.980589 0.0703596 facet normal 0.308982 0.0243228 0.950757 facet normal -0.221424 0.737294 -0.638255 vertex 2.2961 5.54328 6.59 vertex -2.8149 1.17038 6.59 vertex -1.32743 -3.1531 18.1498 facet normal -0.845944 -0.52861 0.0703597 facet normal -0.367773 -0.111478 0.923209 facet normal -4.633145e-001 -8.124056e-001 3.540293e-001 vertex 3.748025e-002 -4.706431e+000 2.479508e+001 facet normal 7.808599e-001 3.477113e-003 6.246965e-001 facet normal 3.267696e-001 5.718465e-001 7.524714e-001 facet normal 2.547723e-01 -7.749087e-04 9.670008e-01 vertex -1.078948e+02 9.695134e+01 8.907542e+00 vertex -1.079020e+02 9.725134e+01 8.909213e+00 facet normal 0.260332 0.938729 0.225866 vertex -7.12884 1.0528 7.81019 facet normal 0.768498 0.630632 0.108232 facet normal -3.306557e-001 5.696047e-001 7.524741e-001 facet normal 0.098404 0.0148568 0.995036 facet normal.

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