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The 3PDT I used appears to be even. Odd values are -=1 difference() { 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 -6.74156 7.03201 vertex 4.64974 -4.64974 7.16319 facet normal -0.312847 0.468207 -0.826383 vertex -2.24521 2.24521 18.7502 facet normal -0.471406 -0.881916 0 facet normal 0.417286 -0.223044 0.880979 facet normal 0.286109 0.952735 0.102165 facet normal -0.634391 0.773012 0 facet normal 4.910369e-001 8.586965e-001 1.467078e-001 facet normal 0.081619 -0.828696 0.553716 vertex -1.94385 9.77239 2.94279 vertex -8.40938 -5.61897 2.58057 facet normal -0.0728683 -0.0676734 -0.995043 vertex -6.37314 7.70061 0.0405804 facet normal 3.987226e-16 -7.910530e-01 6.117476e-01 facet normal -0.773012 -0.634391 0 vertex 5.00013 -7.48323 3.82299 vertex -4.96057 -7.50438 3.82299 facet normal 9.964596e-01 -4.138940e-03 8.397109e-02 vertex -1.093935e+02 9.665134e+01 1.047174e+01 facet normal -0.976256 0.0729258 0.203976 facet normal -4.851179e-001 -8.489565e-001 2.096031e-001 facet normal 0.705398 0.0694843 0.705398 vertex -9.46879 0 3.54602 facet normal 0.769329 0.631365 0.0975244 facet normal -1.397736e-01 -9.901834e-01 -3.529849e-04 vertex -9.858900e+01 9.181025e+01 3.455000e+01 vertex -9.578366e+01 9.188900e+01 3.455000e+01 vertex -1.036795e+02.

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