I believe the confusion is around aerosol vs. ultrasonic. You can see that Optomec's 300 Jet Printer can be configured either with aerosol nozzles (optomec) or ultrasonic nozzles (sono-tek).
To understand how SOTK's technology applies to 3D printing look at applications regarding layered manufacturing, direct write electronics and the atomization of materials for building 2D and 3D structures.
The University of South Dakota and Georgia Tech are making advancements in these areas among other start ups.
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