this is just another portable mini phone stand for your keychain. All you need is a keyring and you're good to go.
There are to versions. One with an inner "fork" width of 9 mm (0.354 inch) and one with 15.5 mm (0.610 inch).
Print it with 100 % infill to get the highest strength.
You need a support for the tapered tail. I screwed this up and made a super sturdy support structure, which i could only remove by sanding. Don't make the same mistake (looked quite good after the sanding, though).
I printed it in PLA and use it since nearly 6 months on my every day keychain. So far it is still in excellent condition.
Oh, the pictured phone is a Galaxy S4, but i use it now with a Galaxy S7 in a similar case. Both work just great with the 9 mm version. One last thing, it works best with soft cases.