A nozzle arrangement for an inkjet printer includes a wafer assembly defining a nozzle chamber into which ink can be fed. A nozzle chamber roof assembly is fast with the wafer assembly and covers the nozzle chamber. The nozzle chamber roof assembly defines an ink ejection port supported by a plurality of outwardly extending bridging members, and a plurality of cantilevered actuators interleaved between the bridging members and extending inwardly to terminate in free ends proximal to the ink ejection port. An elongate heater element extends through each actuator so that, in use, the heater element causes differential thermal expansion in the actuators and thus the free ends of the actuators subsequently to move into the nozzle chamber and force ink therein out through the ink ejection port.