There really isn’t a single “most popular” method for marking or decorating metal. The technology used depends upon the specific application, the type of object being printed on, and the end product the user wants to produce. Many of the technologies the various companies offer for marking/decorating metal – engraving, photo impact printing, dye-sublimation, and UV printing – have advantages for specific types of jobs.
-Matt Anderson, Roland DGA
Learn more about marking metal with a CO2 laser here.