We have broken most of our Vex robotics crank handles, likely because of the torque the students frequently apply to them. This handle has a loose rotator that allows for high-speed cranking, and it's a slightly larger piece. It was designed with the big PLTW automaton project in mind, but can be used for any project using Vex axles. If you need a different type of hole, it's easy enough to use a negative volume in the Prusa Slicer, adjusting it to size. NEW: I have included a medium and a shorter handle to accommodate whatever box size you may be using to make an automaton.
Print this in two parts, and snap the peg into the handle. I found a good pressure fit in several filaments, but you can always glue it as needed. I printed the rotator piece standing on its peg end, and used organic supports, selectively painted on. It doesn't take much support, and should rotate easily once they are removed.
The author marked this model as their own original creation.