Here's another crank from my search for just the right size and shape in my own work. The barrel (part you hold) is print-in-place, and will turn freely once removed from the plate. The stem is short to guard against breakage, but do print it lying down, with some support under the stem; what the Prusa Slicer will auto-generate for this works fine. The arm, which is the lever of the design, is longer than in my other cranks, which gives more leverage for use in builds with a little more friction. It's bent in order to stay out of the way of other mechanical elements. I printed this in petg, with three walls for strength. I friction-fitted the two parts together in a vise. Depending on your settings and the filament used, you may need to do just a little trimming/sanding on the stem base to fit the parts together.
The author marked this model as their own original creation.