A memobox that you can use with A6 paper.
I use it with old draft A4 paper that I have cut in 4 pieces.
You can download the Freecad file also.
version 2 is a 5mm longer and has a bigger hole in front. 30mm instead of 20mm
I've started from another box I've made previously and adjusted the size.
I've cut a hole in front so you can pick up the papers.