Provided is an inkjet printhead having a plurality of ink ejection arrangements. Each arrangement includes a silicon wafer having an ink channel etched therethrough, with ink operatively supplied to a first surface of the wafer via said channel to an ink ejection chamber located along the surface of the wafer. Each arrangement also includes an external actuator arranged on the wafer, and a paddle inside the chamber and attached to the actuator which is activated so as to compress a portion of the ink within the chamber against a sidewall of said chamber to eject ink from the chamber. The chamber defines an arcuate profile shaped to guide the paddle on an arcuate path.