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To collect findings from researching other potential fab plants. Our standard design is the diameter of the knob (in mm). If you want a D-shaped hole, set this to zero. ScrewHoleDiameter = 3; difference() { union() { difference(){ color([.1,.1,.1]) panel(width); // lower h-rib reinforcer cylinder(r=hole_r, h=thickness*2); echo("Putting a hole with radius: ", hole_r , " at ", hole_dist_side, height - v_margin - title_font_size*2; saw_out = [h_margin + working_width/4, row_1, 0]; fm_pot = [input_column - h_margin/2, bottom_row, 0]; pwm_pot = [input_column + h_margin/2, bottom_row, 0]; pwm_duty = [width_mm - h_margin - working_width/8, row_4, 0]; pwm_cv_lvl = [width_mm - h_margin - working_width/8, row_3, 0]; cv_in_2b = [right_col, row_7, 0]; manual_1 = [left_col, row_5, 0]; audio_out_1 = [right_col, row_3, 0]; manual_2 = [left_col, row_1, 0]; fm_in = [input_column + h_margin/2, row_1, 0]; left_rib_x = thickness * 2; right_rib_x = 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); echo("Putting a hole with radius: ", hole_r , " at ", hole_dist_side, height - v_margin - title_font_size*2; saw_out = [h_margin + working_width/4, row_1, 0]; pwm_in = [input_column .

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