Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4679677.
I made this a couple of years ago as many companies were starting to issue RSA tokens, and we needed a goo place to keep them, but didn't want them constantly knocking against our company IDs, or lose them somewhere along the way. I've made my money on the design, so it's time to open source them to the community. As per the license, you may not sell these without my permission. (I may grant permission based on the circumstances)
I've made a number of improvements over the years. I have 2 main versions: One with rounded corners, one with square corners. Then each of those versions has an option that holds 1, 2 or 3 Cards. (ID-1 size cards) I made it so your ID doesn't have to have the punch out at the top to be able to use. The multi card versions have have an internal divider as theoretically, the front facing card wouldn't be getting removed, but any cards in the rear probably would be. They also have a thumb slot to slide the additional cards out without having to remove the front facing card.