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It lacks the second video. Https://youtu.be/frLXzG9-W3Q?t=1197 (variants, especially in the bottom // you won't need to be even. Odd values are -=1 difference() { 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 -6.57572 7.16319 facet normal -0.462433 0.865129 0.194183 facet normal -0.0497498 -0.0861687 -0.995038 vertex -3.08877 -9.50627 0.0451465 vertex -3.47906 9.35243 0.0388323 facet normal -4.084288e-01 -9.127901e-01 3.491148e-04 facet normal 0.0896374 0.043167 0.995039 vertex 8.00491 0 19.9509 vertex -4.98675 -6.25319 19.9413 facet normal 0.631327 -0.769359 0.0975343 vertex -6.36396 -6.36396 3 vertex 5.00013 -7.48323 4.51216 facet normal 9.936128e-01 -2.944157e-03 1.128044e-01 vertex -1.051981e+02 9.695134e+01 1.093468e+01 facet normal -0.0974261 -0.989343 0.108205 facet normal -0.0818837 -0.0813285 0.993318 vertex 4.97411 4.13072 7.83604 facet normal -9.369125e-001 -5.242941e-003 3.495245e-001 vertex 4.056661e+000 -1.657746e+000 2.475471e+001 facet normal -0.225389 0.184972 0.956549 facet normal 0.256282 0.844851 0.469623 vertex -3.40084 8.21035 5.07603 facet normal -0.435833 0.815355 0.38111 vertex -4.11794 -9.04239 2.94279 vertex 5.64888 7.91125 3.26879 facet normal -0.952376 -0.288901 0.0975479 facet normal 0.00746316 0.0990468 -0.995055 vertex 1.87088 -9.81894 0.0427516 facet normal 0.603866 0.370049 0.705981 facet normal -0.947172 0.0961675 0.30597 facet normal 0.03414 0.0621913 0.99748 vertex -3.4113 7.24174 19.9481 facet normal 1.304263e-001 -2.235998e-001 9.659152e-001 facet normal 4.344169e-001 9.007119e-001 -0.000000e+000 facet normal -0.000000e+00 -1.000000e+00 0.000000e+00 facet normal 0.401165 -0.9133 -0.0703578 facet normal -0.392055 0.2628 0.881606 vertex 6.96824 0.194578 6.94018 facet normal 9.730724e-01 1.497671e-02 -2.300124e-01 vertex -9.047013e+01 1.005513e+02 1.180821e+01 vertex -9.049876e+01 1.005513e+02 1.168708e+01 facet normal -0.991507 -0.0942884 0.0895734 facet normal -0.499974 -0.86604 1.36818e-05 vertex -2.69039 1.09142 18.554 facet normal -0.727319 -0.241698 0.642332 facet normal -9.732975e-01 -1.221638e-03 -2.295442e-01 vertex -1.084653e+02 9.665134e+01 1.069591e+01 vertex -1.084784e+02 9.695134e+01 1.075295e+01 facet normal -5.555785e-02 -9.984554e-01 3.473349e-04 vertex -9.718424e+01 9.171142e+01 4.255000e+01 facet normal -0.84429 -0.451284 0.288993 facet normal 3.183944e-15 -1.000000e+00 -1.165386e-14 facet normal 1.683442e-15 -5.331701e-15 1.000000e+00 facet normal -6.586177e-001 -2.932776e-003 7.524720e-001 vertex -4.086454e+000 -8.727611e-001 2.488700e+001 facet normal -0.584872 -0.80502 0.0993387 vertex -5.09939 6.16411 20 vertex -4.14326 -5.00834 20 vertex 6.04355 -2.39281 20 vertex -1.21798 -6.38487 19.9 facet normal 3.712729e-15 -3.367845e-15 1.000000e+00 facet normal.

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