Patent ID: 8119019

Claim:
A method of fabricating ejection nozzles of a printhead, the method comprising the steps of: depositing sacrificial material on a planar substrate to form a scaffold of the sacrificial material on the substrate; defining openings in the sacrificial material to the plane of the substrate at positions for printing fluid channels, sidewalls of nozzle chambers, and filter structures for each chamber, such that some of the chambers are connected to the channels via their respective filter structure and another chamber and the filter structure that other chamber; depositing roof material over, and into the openings of, the sacrificial material so as to form the sidewalls of the chambers on the substrate, a roof of each chamber bridging the sidewalls, and the respective filter structure; etching the roof material to the sacrificial material to form a nozzle aperture through the roof of each chamber; and removing the sacrificial material.