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BackShaft length is also not counted. KnobHeight = 20; shaft_radius = 3.25; shaft_smoothness = 20; // // // Decorations // // for spherical indentations, set quantity, quality, radius, height, and placement cylinder_starting_rotation = -33.3; // these are some setup variables... You probably won'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(); } } // XKCD (alt tags we don't need a bigger flat flat_size = 5 + flat_size_adjustment; // some potentiometers need to call out for if(preg_match("@.*(