A printhead assembly for an inkjet printer. The assembly comprises: a plurality of printhead modules, each module having: a plurality of inlets for receiving ink; and a printhead integrated circuit with an array of nozzles in fluid communication with the plurality of ink inlets for ejecting ink; a flexible printed circuit board for conducting power and data from the printer to each printhead integrated circuit; and a flexible extrusion having a plurality of outlets in fluid communication with the plurality of inlets of the plurality of printhead modules, wherein the extrusion supplies ink provided by the printer to the array of nozzles of the printhead integrated circuit.