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Explicitly account for margin at edges width = 38; // [1:1:84] /* [Holes] */ hole_dist_top = 2.5; // margins from edges h_margin = thickness*2; v_margin = hole_dist_top*2 + thickness; v_margin = hole_dist_top*2 + thickness; working_height = height - v_margin; working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff col_left = h_margin; col_middle = col_left + (15.6 + 1.5 + 7 + 8); // pot + led + switch? Col_right = width_mm - 10 - center_adjust; center_col = width_mm/2.

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