An inkjet drop ejection apparatus formed on a substrate by lithographic etching and deposition techniques. The ink inlet, the actuator and the nozzle being formed in three separate planes respectively, each plane being parallel to the plane of the substrate, such that, the actuator is between the inlet and the nozzle. By forming the actuator directly between the inlet and the nozzle, both sides of the actuator contact the ink as it flows to the nozzle. This enhances the heat transfer from the actuator to the ink, which is then removed with the ejected drop. By removing the heat with the drop, it does not conduct to the substrate and cause cross talk. With the inlet, actuator and nozzle vertically stacked with respect to the plane of the substrate, the ink can be fed to the chamber from the back of the wafer rather than to the sides of the chambers. Without the ink supply channels adjacent the chambers, the nozzle density on the face of the substrate is greater.