Knob-Stable Finger

prusaprinters

The knob turns with your finger in the rotating offset.  It was printed with a 0.4 mm radius clearance so that it is “floating”.  The finger interface is retained with a trapezoid cross-section.  The highlight of the print is putting a pair of pliers on the finger cylinder to break it loose.  It did break lose consistently.  I added cylindrical supports to the design bottom, so it prints altogether.   The potentiometer interface supports are located to allow the interface to flex a bit more than some designs.  The convex finger top seems to work better than the concave design.