These were modeled after the industry standard Bondhus allen wrench set holders for the style. A little chatGPT help to determine what diameters to make the holes and these this just works. For $1.99 you can buy these in plastic on MSC…but…that isn't the world we are in these days!
2nd photo shows the wrenches staying in the holder when upside down. (May or may not have been an issue with that with others I tried to print)
The author marked this model as their own original creation.