Printers can print characters as large as 2.75” (70mm) and 0.66” (17mm). Machines are equipped with patented automatic self-cleaning and self-maintenance systems that ensure good quality and repeatable print quality in any environment. Because the self-maintenance system is noncontact it also avoids printhead damage that is possible during periodic maintenance. The user interface displays ink use monitoring and low-ink warnings. New ink can be added without halting production using nonpressurized containers.