Stack the trays from smallest to largest and throw in a handful of coins. Give it a few shakes to separate US quarters, nickels, pennies and dimes.
I also uploaded a set of 8 trays for sorting Euro coins.
The trays nest in the opposite order for compact storage, or use as a coin tray.
I've included my (awful) scad files. If you figure them out, you can modify them to make customized trays of other sizes or for other currencies or other uses (nuts, washers, etc...). If you do use my scad files to make a re-mix, please link your re-mix back to this model.
The author marked this model as their own original creation.