A printing system is provided having a printhead, a media drive mechanism for driving media to the printhead for printing, and a media cartridge for supplying the media. The cartridge has a rotatable core for a roll of media and a media delivery arrangement having an opening in the cartridge. The media delivery arrangement is arranged to enable a roller of the print media drive mechanism to contact a wound portion of the roll of media so as to feed an unwound portion of the media from the roll to the printhead on demand operation of the roller on the wound portion.