A couple of swatch holders and a Rhino Grasshopper script to autogenerate swatches. One has five slots to show what is in the MMU.

Each swatch has a few different features to assess filament behaviour, including 4 panels of 0.6, 1.2, 1.8 and 2.4 mm thickness to assess opacity.

The script is available from here: https://github.com/Mjankor/Miscellaneous

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.