A printhead assembly for a pagewidth drop on demand ink jet printer, comprising an array of printhead modules extending substantially across said pagewidth, a flexible printed circuit board carrying data and power to said modules, the flexible printed circuit board also extending substantially across said pagewidth, a pair of busbars electrically connected to the flexible printed circuit board and carrying power thereto, the busbars also extending substantially across said pagewidth, wherein said printhead modules are fixed to an elongate channel and wherein an elastomeric ink delivery extrusion is situated between the modules and the channel.