This is a replacement wingnut (hopefully that is a good term for this) for the Rugged Ridge 13551.13 Dash Multi-Mount System Phone Mount for 07-19 Jeep Wrangler JK and JL.
The molded plastic wingnuts that comes with this product keeps breaking so I created one that is a little tighter and stronger. It fits on the 17mm ball mount system.

For some reason importing the .stl into Cura requires scaling down to .1% while the IIIP (Monoprice Maker Select v2) slicer that came with my printer scales it appropriately on import. The stl was created from m and not mm.

At .1%, this is a very tight fit, consider increasing the scale slightly. If there is enough interest, I may tweak the model for a better fit and larger wings to make it easier to tighten.

I also had to thread the entire wingnut as the slicer was filling in the top opening.