My major peeve with the Apple Airpods is you have to carry around that little charging case everywhere. You are already carrying the bigger iPhone, car keys, payment method in your pocket - now you have to add this case. If you throw it in with the keys it quickly gets scratched pretty badly. Throw it in with the cards - bulky. It's not going in the back pocket with the phone so what then. End up carrying it in your hand - kinda sucks. I designed this little clip that goes on the belt nicely.
You may need to scale it up 1.3% to make it snug but not too tight. As is now it is snug and takes a bit of work to get it back out if you happen to jamb it all the way in there. I use it & I like it. Hope you do too.
Oh, add supports so that you get the top printed cleanly.