This is an older version you will find the actual on here: https://thingiverse.com/thing:2823667
This thing allows you to attach the labeling sticker, delivered together with your filament refill, to your
"Masterspool Twist and Lock" (https://thingiverse.com/thing:2823667)
You decide on wich side to attach. Changing the filament no longer means to peal off the old sticker - simply use another one and maybe store the old one for next time you get the same filament.
Before using it, you have to cut free the springs on the backside of the ClipOn.