A printhead cartridge for an inkjet printer that has a paper path for sheets of media substrate. The printhead cartridge has a cartridge body configured for user insertion in, and removal from an inkjet printer such that during printing, the cartridge remains stationary relative to the paper path and a printhead having a plurality of printhead ICs, each defining an array of nozzles for ejecting ink on to the sheets of media substrate. The printhead is mounted to the cartridge body such that when the printhead cartridge is installed in the printer, the array of nozzles are adjacent a planar section of the paper path, and no part of the printhead cartridge extends into the plane encompassing the planar section of the paper path.