Hi all, hope I'm not intruding or posting in the wrong place, and I apologise in advance if I have. 1st, I am not a grad student, simply a guy with the desire to invent things and fix stuff till it's broken. A few of my projects include a solar tracking system, which analyses webcam images and aligns dishes toward the sun, and also many smaller projects, many of which never leave paper. Here is a project I am trying to get into motion - a giant printer, for printing signs. I have everything planned, and pretty near what I believe will work, except the sprayer nozzles. Using air brush pens is not an option because the overspray will not render a crisp image. I had considered first to use diesel fuel injectors, but there are many reasons why that will simply not work. I have settled on making 4 high speed valves, probably driven by voice coils from a large speaker, to control flow from a high pressure paint line. (Driven by speaker coils, connected to amp, connected to computer which would use the sound card to manipulate the spray duration and intensity.) Now, where on earth can I ever find small nozzles, that will put tiny 1/8th inch dots on the board in a perfect and even circle? They need to be very small, and also able to handle very high pressure. Any clues or ideas on this would be awesome. Thanks in advance.