If you already printed the Hex Spools and didnt see the Remix with Labels (https://makerworld.com/de/models/36802#profileId-35070) , this is a clip on Label for the Spools. Also you can now label both sides if you want ;-)
A small Arrow on the Backside indicates the orientation( has to point to the center of the spool).
I printed in PLA and it works great.