Don't print this, it was a rushed design and too tight on normal fingers, not comfy or great. Search for prior art reveals this
https://www.thingiverse.com/thing:4192643
I think its superior in every way. Go for his design instead.

Keep it in your pocket, use it to open door handles so you don't pick up germs from the pull handle when exiting the canteen or toilet. Disinfect it regularly and save your hand from germs. There's nothing worse than washing your hands and then touching the same handle that someone who didn't wash there hands just used.