An inikjet printhead including an ink chamber. The ink chamber includes a nozzle defined in a first wall and an ink inlet aperture for introducing ink into the ink chamber. Also provided is a movable circular paddle positioned within the ink chamber for ejecting ink from the nozzle, the movable circular paddle having an annular upturned edge surface. An annular rim edge is positioned internally adjacent a cylindrical wall of the ink chamber, the annular upturned edge surface and the annular rim edge defining an annular aperture between the nozzle and the ink inlet aperture. The paddle can also incorporate a plurality of truncated pyramids circularly positioned adjacent the annular upturned edge surface.