The invention provides for an elongate bi-lithic printhead unit for a pagewidth printer. The unit includes two integrated circuits laid end-to-end, each having a multitude of micro-electromechanical nozzles for operatively ejecting printing fluid. The unit also includes an ink distribution plate for feeding printing fluid into apertures defined in the integrated circuits, and an ink distribution molding defining a plurality of elongate conduits for distributing printing fluid to the plate along a length of the printhead. The unit further includes a printed circuit board (PCB) configured to relay data signals from a printer controller to respective ends of the integrated circuits, as well as a support member for holding the integrated circuits, plate, molding and PCB in appropriate alignment.