I downloaded a few versions but decided to make my own one.
Its light weight, it's not too hard to remove the AirTag and the ring hole isn't too long. Battery can be changed without removing the tag from the ring.
Also it only takes 5 minutes to print one.
Carefully engineered to fit perfectly.
For the best result print in PLA (.gcode for MINI included).
Edit: I recommend printing this model with PETG as its more UV resistant and won't get brittle after some time. Due to the lower stiffness I reworked the model and uploaded as R2.
The author marked this model as their own original creation.