Three words to describe this model: tolerances, tolerances, tolerances.

I found that when I got the fit right, then printed in another PLA, the fit was too tight or too loose.

I put this down to the material shrinkage varying between brands - as a possible way fix that you can play with the flow rate to change slightly the printed proportions of the holder.

To use:

Once printed, place your AirTag metal side down in the base component - the fit should be snug.

Place the top over the base at a 60º angle, press the 2 halves together, then rotate the lugs together. If too tight, do not force it otherwise it may be difficult to separate the parts again.

Lock the assembly with a split keyring type ring.