Moved my printers over to a heavy duty metal shelving unit. So I made some simple little tags to quickly identify the filament types in my AMS' and these are magnetic so they do not move unless you put some deliberate force on them.

First plate is a few common filament types the second plate is full of blank arrows to make your own.

All arrows have two holes for magnets I used the 8x3mm neodymium magnets from Amazon.