MEMS jetting structure for dense packing

A method for fluid ejection from a print head, the method comprising:

• providing an electrical signal along a particular electrical connection of an interposer to a particular fluid ejection actuator of multiple fluid ejection actuators housed by a substrate,
• wherein each of the multiple fluid ejection actuators corresponds to a respective ejector flow path defined through the substrate, each ejector flow path including a nozzle defined on a first surface of the substrate, and a conduit extending from the nozzle to a second surface of the substrate opposite the first surface, and
• wherein the interposer is attached to the second surface of the substrate and wherein a surface of the interposer that faces the second surface of the substrate is separated from the second surface of the substrate by an air gap, and
• wherein the interposer includes multiple electrical connections and multiple interposer flow paths, each electrical connection corresponding to a respective one of the multiple fluid ejection actuators and each interposer flow path being in fluid communication with a corresponding ejector flow path;
• actuating the particular fluid ejection actuator responsive to the electrical signal, comprising deflecting a membrane of the particular fluid ejection actuator into the air gap;
• and
• ejecting fluid from the nozzle of the particular ejector flow path corresponding to the particular fluid ejection actuator responsive to actuation of the particular fluid ejection actuator.