Window crank knob for 2002 GMC van. I used PLA, 15% infill. You may need to increase infill if the stem snaps from use. I could not find any other versions with the support ring. The original idea came from Thingiverse, but that model broke within a week. This is remade from scratch in Tinkercad, the design is basically the same with the addition of the support ring. The ring is snug at first but will turn smooth after a few uses.

The stem tip may need sanded or trimmed, a dab of grease on the stem really helps. It is a tight fit so it doesn't pull back out.