Printing cartridge having self-referencing printhead

A printing cartridge for an inkjet printer, the cartridge comprising:

• an ink supply;
• and
• a printhead assembly comprising at least one printhead integrated circuit having a plurality of ink ejection nozzles and an ink distribution support mounting the, or each, printhead integrated circuit, the ink distribution support being arranged, in use, to distribute ink from the ink supply to the nozzles,
• wherein the printing cartridge is mounted to the printer at the ink distribution support,
• wherein the ink distribution support is provided with at least one reference feature, the, or each, reference feature serving to provide information on the location of the nozzles upon mounting of the printing cartridge to the printer, and
• the ink distribution support is an elongate support, and the, or each, printhead integrated circuit is mounted to extend longitudinally along the elongate support so that the nozzles create a printing zone which extends across a pagewidth.