This AirTag holder is designed for Flexible filaments so that the AirTag can be pushed into the holder. This will NOT work for PLA or PETG. Use NinjaFlex or equivalent.
There are two version.
This AirTag keyring holder is based upon Apple's published dimensions of 31.9mm X 8mm and photos available since the announcement. V2 updated to better match the curvature of the AirTag body. Added a refined (external shape) V3 version of the A type. This one will benefit from supports.
Print at .1mm layers for best results.
For a more refined AirTag keyring case, check out my AirTag Twist-Lock keyring case on MyMiniFactory: https://www.myminifactory.com/object/3d-print-airtag-keyring-twist-lock-case-167136