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Top surface of the knob. [mm] sphere_indents_cutdepth = 3; difference() { 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); cylinder(h=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 -7.5203 6.0001 facet normal 0.0377392 0.272853 0.961315 vertex 0 -7.79364 5.97318 facet normal 7.640483e-01 -6.451590e-01 3.338815e-04 facet normal 0.634386 -0.773016 0 facet normal -0.993001 -0.0642719 0.0990887 vertex -7.93692 1.00267 20 facet normal 0.0620385 -0.077794 -0.995037 vertex 6.37291 7.69968 0.0489512 vertex 7.20635 -6.91828 0.039823 facet normal -0.94716 -0.0961108 0.306023 facet normal -0.343415 0.685181 0.642334 vertex 4.46869 -4.91993 7.17054 vertex 0.261859 -6.79329 7.03804 facet normal 0.528289 -0.575169 0.624573 facet normal -9.627241e-01 -3.427783e-03 -2.704636e-01 facet normal 0.681193 -0.725337 0.0993103 facet normal 6.869846e-01 7.266720e-01 -0.000000e+00 facet normal 0.470877 -0.0463745 0.880979 facet normal 0.0819177 0.0822333 -0.993241 vertex -4.03376 -2.95564 21.7809 facet normal -0.634912 -0.772501 0.0113542 facet normal 9.804872e-001 4.851527e-003 1.965229e-001 facet.

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