Combine this with any credit card-sized wallets to store Euro coins. This can store two items of each Euro coin in a wallet that can hold credit cards, like https://www.printables.com/model/766390 or https://www.printables.com/model/246538.

This does not require any supports. I printed with PETG and 20% infill, though this should not really matter given that the part is not supposed to be under particular physical stress.

I designed the holes with a diameter each 0.25mm larger than the official size specification for the coins, which in my print makes it a tight fit with the coins in reality.

If you live in a country with a different currency this is likely not particularly useful for you but you may take the idea and design a similar thing according to the specification of coins used in your country.