Just found out that my design is very similar to one by Venegade. While I don't think I've ever downloaded Venegade's design, mine is similar enough that I'm going to cite their design as a remix source - https://www.thingiverse.com/thing:2953888.

This is a filament swatch holder and swatches. It has storage for 15 swatches in the top, another 15 underneath, and slots for 5 swatches that represent the 5 spools in a Prusa MMU setup.

I've also included basic swatches, which you can ad your own text to. If anyone is bored, then feel free to make a customisable variant of the swatches.

I wanted fairly small swatches that can be printed quickly. These can easily be printed in around 20 minutes.

I've also added a variant of the Swatch Boss, with a raised top, so that swatches are held more securely, called "Swatch Holder - Extended.stl"

Print Settings

Supports:

Yes