I needed a tray for my DUMB Wallet Airtag edition. https://www.printables.com/model/1213107-the-dumb-wallet-airtag-edition
This is a remix of the model OldManGrimm made. https://www.printables.com/model/1247151-dummy-storage-cards-for-eg-dumb-wallet.
It adds a thin (0.6mm) bottom layer that I needed since I had no flat layer due to the airtag.
I also added the openscad file if you want to tweak the:
Kept it simple Santa.
The author remixed this model.
When I tried to use the original design, it didn't work so well with the DUMB Wallet Airtag edition.
I added a bottom layer so that it can be used as a tray. Further to that I'm sharing my openscad version in case others want to modify it for their liking.