I created an organizing cup (Euro Coin Holder, Card and Pencil Holder)
The organizer is designed to fit in a cup holder (from cars, railway...)
1€ / 0,50€ / 0,10 € will fit in the organizer.
There were a few more slots for cards and pencils, and a lot more stuff.
Feel free to view or edit it on Tinkercad.
Joshuatparr organizer was my inspiration for this one.