In your design, take into account of the Manufacture’s and Printer’s inaccuracy

Laser and inkjet printers have an accuracy of approximately plus or minus 1mm in the vertical and in the horizontal, and the paper can also rotate slightly as it goes through the printer. You need to take this into account when you design your labels. If possible, avoid designing labels with a border around them because any inaccuracy will be visible.

Laser and inkjet printers do not print right up to the edge of the A4 sheet, so if you have labels with no side border remember that you need to allow 3mm (depending on the printer) as a border.