- Why do I only get US Legal and US Letter when printing from iPhone? -- Something has changed in Airprint or iOS and you need to manually set your preferred size in cupsd.conf Add the following to the bottom of cupsd.conf DefaultPaperSize A4 # DefaultLanguage <locale> (de,en,fr etc) delete the contents of /var/cache/cups/* and restart cupsd-service or restart docker container type ippfind to get the ipp uri of the printer verify your settings with ipptool -tv ipp://<url> /usr/share/cups/ipptool/get-printer-attributes.test | grep media-ready