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Expand a bit, but also size it for practice ** about $3 in parts (no ICs), and a momentary-on button to advance the step LED + 23mm hole_left = slider_center - 13; hole_bottom = hole_top - 90; hole_bottom = hole_top - 90; DivotRadius = KnobMinorRadius*.4; // Primary knob cylinder for (i=[0 : Knurls-1] rotate([0.

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