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Zero. ShaftLength = 0; right_rib_x = width_mm - right_rib_thickness; // projection: make a hole with radius: ", hole_r , " at ", width_mm - h_margin; col_left = thickness of the arrow. Scale([engraved_indicator_scale * 0.3, engraved_indicator_scale * 0.3]) 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 7.49999 6.0001 vertex 1.46317 7.35588 6.0001 vertex -4.16678 -6.23601 6.0001 vertex -1.46317 -7.35588 6.0001 vertex 6.23601 -4.16678 6.0001 vertex -4.16678 -6.23601 6.0001 vertex 4.16677 -6.23601 6.0001 vertex 4.16678 6.23601 6.0001 vertex 5.30329 -5.30329 6.0001 vertex 4.16677 6.23601 6.0001 vertex -6.23601 -4.16678 6.0001 vertex -4.16678 6.23601 6.0001 vertex 4.16678 6.23601 6.0001 vertex 6.92909 -2.87011 6.0001 vertex -4.16677 6.23601 6.0001 vertex 6.92909 -2.87011 6.0001 vertex -4.16678 6.23601 6.0001 vertex 1.46317 7.35588 6.0001 vertex 6.92909 -2.87012 6.0001 vertex -2.87011 -6.92909 6.0001 vertex 6.92909 -2.87011 6.0001 vertex -4.16677 6.23601 6.0001 vertex 6.23601 4.16678 6.0001 vertex -4.16678 -6.23601 6.0001 vertex 6.92909 2.87012 6.0001 vertex 4.16678 6.23601 6.0001 vertex -1.46317 7.35588 6.0001 vertex -6.23601 4.16678 6.0001 vertex -7.49999 0 6.0001 facet normal -3.874232e-001 -6.779889e-001 6.246874e-001 vertex 2.038963e+000 3.505762e+000 2.484855e+001 facet normal -8.724433e-001 -3.885432e-003 4.887000e-001 vertex -4.052033e+000 -1.693851e+000 2.484855e+001 facet normal -0.993092 0.0625032 0.099304 facet normal -0.976242 0.096139 0.194186 facet normal 5.564408e-02 9.984506e-01 -3.482704e-04 vertex -9.718411e+01 1.060913e+02 2.550000e+00 facet normal 3.573127e-07 -1.000000e+00 -5.943996e-07 facet normal -0.737769 -0.601732 0.305966 vertex 4.43402 4.43402 7.71007 vertex 4.47998 4.47998 7.50886 vertex 4.35153 -4.6363 7.51116 facet normal -0.634388 0.773014 0 vertex -7.83991 -5.34516 6.17309 facet normal 8.589944e-01 -6.172555e-03 -5.119478e-01 vertex -1.091977e+02 9.695134e+01 1.195580e+01 facet normal 7.799903e-001 6.257917e-001 -0.000000e+000 vertex 7.097801e+000 1.470900e-002 1.747200e+001 facet normal -1.778163e-001 3.074464e-001 9.348038e-001 facet normal 0.0393762 0.305317 0.951436 vertex -5.204 4.958 6.88408 facet normal 0.989331 0.0975625 0.108193 facet normal -9.521120e-01 -0.000000e+00 -3.057496e-01 vertex -1.069378e+02 9.665134e+01 4.440930e+00 vertex -1.070034e+02 9.725134e+01 4.645269e+00 vertex -1.069378e+02 9.715134e+01 4.440930e+00 facet normal -0.768512 0.63062 0.108202 facet normal -8.244231e-16 -2.375573e-15 -1.000000e+00 facet normal -0.491602 0.262751 0.830234 vertex -8.44684 3.49879 3.76384 vertex -5.12136 -7.38374 3.82299 facet normal -0.29707 -0.243766 0.923216 vertex 1.72277 -8.83032 3.82299 facet normal -0.0127296 0.705404 0.708692 facet normal 0.491602 0.262766 0.83023 facet normal -0.125325 -0.992116 -0 facet normal -0.366246 0.925203 0.0993121 facet normal -0.980785 0.195093 -6.4466e-07 vertex 3.21351 -1.06324 6.59 facet normal 0.900365 -0.42367 0.0992329 facet normal -0.243832 -0.29704 0.923208 facet normal -0.0818425 0.081922 0.993273 vertex 5.22724 -5.17002 6.86195 vertex -5.24702 5.16396 6.86308 vertex 5.22724 -5.17002 6.86195 facet normal -5.967591e-01 8.024204e-01 1.230855e-04 vertex -9.325429e+01 1.047901e+02.

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