Some Aditional Ideas to the Cascade card wallet (Print-in-place)

First I created a slide-in tray in which two coins fit on top of each other. please note that you might want to put some tape on the back to create more friction so that the tray does not fall out due to the weight of the coins.
Then I made a more stable larger version of the wallet which can hold up to 8 cards.
And finally a version that has a hole on the side to hang it on a keychain without compromising the functionality.