The Sono-tek nozzle is used in the Optomec's “3D electronics printer.” Atomization and ultrasonic nozzles are key components necessary for these applications that actually print electronics on 3D printed objects. This is the holy grail of 3D printing -- previously you would have to add in the electronics later. With this technology, just print the electronics at the same time.
You can find an article and a video if you search for Optomec at the site 3Dprinter.net. Be sure to watch the second video on the resulting page.
Here's an excerpt:
"3D printer powerhouse Stratasys and the unique “3D electronics printer” (among other things) company Optomec have been working together to develop a method to deposit conductive material into a 3D printed object. For their first project, the two companies are working together on developing a 3D printed Unmanned Aerial Vehicle (UAV), for which they will 3D print the UAV, including embedded conductive paths that would replace hand-inserted wires, ties and glue. Faster, more efficient and lighter as well."
"Optomec uses Aerosol Jet Deposition, which is a form of 3D printing where, according to the Optomec site, “the printed electronic systems have the unique ability to produce a wide range of electronic, structural and biological patterns onto almost any substrate. The proprietary process, which is totally different from ink jet, utilizes aerodynamic focusing to precisely deliver fluid and nanomaterial formulations that as required can be optionally post-treated with a highly focused laser or other sintering methods. The resulting patterns can have features that are less than 10 microns wide, with layer thicknesses from 10′s of nanometers to several microns."