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 sandpaper. A 8mm level may only fit 6-8 of the 150-grit sandpaper, but will fit well over 10 sheets of 1000-grit sandpaper.

I've also provided the overall dimensions of each organizer, along with an approximate weight of filament required. The 8x8mm configuration takes about 250g of filament.

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Printing

This is printed standing upright. It is 240mm in length, but most configurations should still fit diagonally on a 230mm bed.

No supports are required. A brim is recommended, but not strictly necessary. This is, however, a long print and it would be a shame if it fell over or even if a corner lifted up. The brim would be on the back/bottom of the organizer, so it shouldn't substantially impact the appearance.

This design is optimized for a 0.4mm nozzle. I used the default 0.2mm layer height, but this is probably flexible. 2 walls and 15% infill are plenty.

I printed mine in PETG because I want to store it in my garage, which isn't temperature controlled. The dividers between the levels are very thin, and would be prone to warping if printed in PLA and exposed to high heat. If you're using it only in a temperature-controlled environment, PLA should be fine.

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Customization

I have provided a parametric FreeCAD file for anyone who would like to customize their organizer. There is an object called “Configuration” in the FreeCAD file. If you click on that, it will give you a few parameters you can easily adjust: the number of levels, the height of each level, and whether or not to include labels and/or screw holes. Once done, click on the “Sandpaper Organizer” object and select File > Export… to export it as an STL.

If you need to customize more than that, you can try adjusting more parameters in the ‘dd’ (dynamic data) object. Your results may vary depending on what you're trying to customize. You can also reach out to me if you have a specific need.