"Cats Fed" Day Marker

I needed something to help my housemates and I know whether one of us had fed our cats that day*, so I made this.

After one of us has fed the loudly meowing cats, we move a little stone to the box for today.

It can be used in place of any whiteboard daily covered with "Did " (though you'll have to change the "Cats fed" text in my messy .scad).

*Because they meow at you even after they've been fed