Print once — each bucket keeps its sticker for good. Scanning it (scanner or phone camera) opens that bucket in the Ferment Buckets app.
In the print window choose Scale: 100% / Actual size (not "Fit to page"), Margins: None, and turn Headers and footers off. Laser printer only. Test on plain paper first: hold it against a label sheet up to the light.
To replace one worn sticker, set first and last to that bucket's number.