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BackJacks triangle_out = [width_mm-h_margin-working_width/4, row_1, 0]; saw_out = [output_column, bottom_row, 0]; fm_in = [input_column + h_margin/2, row_1, 0]; pwm_in = [width_mm - h_margin - working_width/8, row_3, 0]; left_rib_x = thickness * 1.2.