I made this because I didn't have the proper tool available, and needed some more grip to loosen some large hex nuts holding the crosstube barbs of a BlueBoat. The internal nuts (inside the hulls) are in quite a confined space, and my fingers were slipping off while trying to remove them.
I printed this in PLA with 4 outer perimeters, 4 top and bottom layers, and 40% gyroid infill. It ended up flexing more than I'd like, but it did the trick. Uploading on the off chance someone else happens to be in a similar predicament.
Due to a poor calliper measurement I designed this as though the nut was 42.33mm (1⅔"), but the effect is marginal on a nut this size. The nut size is one of the constraints in the FreeCAD file, so can be modified if relevant.
The author marked this model as their own original creation.