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Variant of 2, often played before 2, to build up seven rows; middle one unused row_2 = row_1 + vertical_space/7; row_7 = row_6 + vertical_space/7; row_3 = row_2 + vertical_space/7; cv_in_1a = [left_col, row_5, 0]; cv_in_2a = [left_col, row_3, 0]; left_rib_x = thickness * 1; right_rib_x = 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 9.96384 2.94279 facet normal -0.273151 0.564052 0.779252 facet normal -4.127371e-001 7.075877e-001 5.735571e-001 vertex 2.587998e+000 -4.442636e+000 2.484855e+001 facet normal -9.675077e-001 -2.528414e-001 0.000000e+000 vertex -3.893586e+000 4.057701e+000 9.983999e+000 vertex -6.709746e+000 2.137466e+000 1.747200e+001 facet normal -7.990003e-01 -6.013306e-01 -0.000000e+00 facet normal -0.000756237 -0.0978509 -0.995201 facet normal -0.195077 -0.980788 0 facet normal 9.369221e-001 3.100829e-003 3.495245e-001 vertex -4.023317e+000 1.591250e+000 2.475471e+001 facet normal 0.257144 -0.137446 0.956549 facet normal 1.773479e-001 3.077163e-001 9.348040e-001 vertex 3.836165e-002 -4.904383e+000 2.495400e+001 facet normal 0.766035 -0.075425 -0.638358 facet normal.

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