Keep it simple!
This filament sample is tiny and easy to organize if you are using Prusament spools.
You can use one half of an empty spool.
In my case i use the Masterspool remix (https://www.printables.com/de/model/36179-your-last-spool-prusament-spool-to-refill-adaptor-) in order to have it in use.
Just plug-in the printed number and save the data on a textfile on your desktop.
An other opinion is adding the number in your custom filament profil in your slicer.
For a closer look you have a second “bigger“ sample with the same number and a material tag.
This second sample can be stored in a filamentbox (if you have one left), lined up on a string or just stored in any printed box you like.
The first STL is without number and material to change it in your favourite construction tool.
You can also use this one on ThinkerCAD: https://www.tinkercad.com/things/8lcmKjUxzvn
Have fun and enjoy printing!
The author hasn't provided the model origin yet.