Started putting QR Codes on my filament so I know how old it is and what brand / color
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What do you use to print/stick the QR code?
noteqr.de
Not OP but for sticking you can probably get square labels from Avery, or be lazy and print on printer paper and use packing tape to adhere.
Yes, I use Avery Labels. Still looking for an alternative because I would like to have smaller ones so I can stick them to very small stuff but the smallest square label I have found so far is 20x20mm