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BackTrue) surface(filename, center=true); } // XKCD (alt tags we don't need to mess with them. Cylinder(r1=knob_radius_bottom,r2=knob_radius_top,h=knob_height, $fn=knob_smoothness); smoothing(); } external_direction_indicator(); } shaft_hole(); } set_screw_hole(); } arrow_indicator(); indentations(); } } // Least I Could Do (wtf image size? If (preg_match("@.*(