Gridfinity sandpaper holder (triangle)

In my idea of tidying up my workshop, I want to store my sandpaper. So I create this box to store my triangle sandpaper (see https://makerworld.com/en/models/1078740 for round sandpaper box). The most common sizes are provided and a version with no size written on it is provided so that the value can be put directly into the slicing application. Details of the bin:I followed Zack Freedman's Gridfinity specification for the bin size. I started from the specification described here: https://www.printables.com/model/417152-gridfinity-specification. Some modifications have been made:I have changed the bottom of the bin: there is now only one magnet instead of four, which reduces the number of magnets needed. Additionally, the magnet is a bit larger (10x2) and central (no support needed)Compatible with any Gridfinity baseplate