💡 Printing tips: the paper sizes in the print dialog come from your printer's driver — select your thermal printer and its 80 mm roll paper (not A4), set margins to None and scale to 100%. If your printer only shows A4, use Save PDF below — the PDF is exactly 80 mm (or 58 mm) wide, so printing it at "Actual size" comes out right. On Android, share the PDF to your printer's app or a thermal-print app like RawBT.