Square AirTag case
thingiverse
It is a square AirTag case. It can be attached by fitting the AirTag. The trick is to push it in diagonally when you wear it, and push it diagonally when you remove it. When installing, you need to insert the AirTag with the silver part facing down. When using an FDM 3D printer, I think it is easier to remove it if the resin density is not too high (not too hard).
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