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Col_left + (15.6 + 1.5 + 7 + 8); // pot + led + switch? Col_right = width_mm - right_rib_thickness; // projection: make a 2d version v_wall(h=4, l=height-rail_clearance*2, th=right_rib_thickness); //outline of whole PCB? // cube([137.5, 97, 1], center=true); working_increment = (working_height-v_margin+thickness) / (9); // generally-useful spacing amount for vertical columns of stuff working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff working_height = height - rail_clearance - thickness*2 - 16.5/2; // 16.5 is the two resistors Properly assign potentiometer pads and thermal vias; see figure 8.2 of https://www.silabs.com/documents/public/data-sheets/efm8bb1-datasheet.pdf 20-Lead Plastic Quad Flat No-Lead Package, 9x9mm Body (see Microchip Packaging Specification 00000049BS.pdf 48-Lead Thin Quad Flatpack (PT) - 10x10x1.0 mm Body [VSON] http://www.ti.com/lit/ds/symlink/csd87334q3d.pdf VSON, 10 Pin (http://www.ti.com/lit/ml/mpds579b/mpds579b.pdf), generated.

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