I designed this to hold a pair or earplugs, but it could fit a variety of small things.

It is print in place and features a small tab for positive closure. I think I got the snap working perfectly. The hinge has a 0.25mm clearance which worked perfect on my P1S. I printed mine in PLA silk at 0.16mm layer height.

My round case was quite popular so I decided to make a square one for some variety.

Original model at thangs.com: https://social.thangs.com/m/1061622