I need two forearm crutches but wanted to be able to have a hand free without having to hold both crutches in one hand. So I created this belt clip that I wear permanently on my belt for a few months now. I created a second version that I thought might be a bit stronger, but I haven't tested it yet.
It fits on a 40mm wide and 4mm thick belt.
You can "easily" snap in crutches with a diameter of 22mm. In the beginning the fit might be quite tight and you need some force to attach/remove the crutch - try not to slap people during removal ;) - but after some time it gets easier.
I included the Fusion 360 file so you can adapt it to your needs. I am not great with Fusion so things might get a little messy if you change the parameters :D
If you cannot edit it yourself feel free to ask for a version matching your parameters.
Print it standing up with supports on the build plate. I used PLA and have been using it for a few months now without any problem other than a very slight decrease in strength.
Make sure to use enough perimeters/infill that the front part (2.1mm thickness) is solid.