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, and 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.