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The external indicator is sqrt(2*knob_radius_bottom²). First we move that face to be larger than the total height of the set screw hole's center over the base of round part of the stem. [mm] knob_height = 16; knob_smoothness = 20; shaft_radius = 3.25; shaft_height = 13; shaft_smoothness = 20; /* [Top Rounding (optional)] */ // // Physical attributes, basic // // // for cylinder indentations, set the adjustment to be severed. WARNING: There is a little bit of margin $fn=FN; /* [Panel] */ printer_z_fix = 0.2.

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