This is an addon to the Coin Sorter by danielbeaver, his version of the shake to sort coin sorter is by far the best one I have tried. It stacks well, and is a decent enough size you can sort quite a few coins at once.

However the top does have 2 small issue. One, the coin slot is just a bit too tight for quarters. You can force them through but they will not just drop through.

Two, the top fits so perfectly you cant easily lift it off. You can poke your fingers through the bottom holes and lift if off, but my 4 year old granddaughter has trouble with it.

So I made a new top with a bigger slot and a handle. The slot will handle up to a dollar coin and there are two versions of the handle. One with a single point to grasp, and one with 4 handles so you can stack something else on top.

The original Thing is here:
https://www.thingiverse.com/thing:4247473