Hi Nancy!
Just as Steve and Dean said, most printers have some sort of restrictions of what frame, where the image is positioned, ect. before the stencil will work in the printer. The two manufacturers that I'm most familiar with DEK and MPM do have adapters that will allow you to use different frames, but even still, there's limited types of frames you must use.
However, the year before last at NEPCON when I was working for Zevatech, there was a printer that was used in the PCMCIA portion of the TAC line (where we had two machines set-up) that impressed me, it was from a company called Ekra. Supposedly, they've been around quite awhile, just have never marketed the printer here in the states.
We were doing a double-sided PCMCIA card and the line we had set-up was a flip line, so there were two of these printers in the line. We were doing flip-chip, Micro BGA, and BGA and the printers did really good.
The neat thing was that you could use any frame you wanted, and as long as the image was centered, you were in fat-city. The printer used vision, had variable, controlled PCB/Stencil separation speeds, and variable print stroke speeds, and the price at that time was 100K...pretty darn cheap when you look at what the others cost.
-Steve Gregory-
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