Parametric Sandpaper Organizer

I bought a multi-pack of sandpaper and I wanted a good way to store it that allowed me to easily access the sandpaper I wanted. So I came up with this layered offset design, and it's worked well for me. The separate layers make it easy to pull the sandpaper out, and the labels make it easy to find what you're looking for. The organizer works well horizontal or vertically. It is very portable – it is easy to pick up the entire unit and move it to where you are sanding. It can be mounted to the wall using screw holes on the back of the organizer. Use M4 or #8 flat head screws to mount it. The screw holes are 180mm apart. The images show the 8x8mm configuration that worked best for me, but there are numerous other configurations available. You can further customize this in FreeCAD if you need a configuration that isn't available. I've provided approximates for how much sandpaper each organizer can hold. This is based on 150-grit sandpaper. Coarse sandpaper tends to be thicker than fine sa