The direct thermal built-in printing mechanisms Citizen PMU2200II/2300II process variable rolls with a diameter up to 102 mm, even in particularly challenging areas of usage. Fast paper handling, as well as various mounting options for receipt rolls and printing units provide the necessary flexibility that is required with installations in machines and kiosk systems. Depending on the need, a horizontal and a vertical variant may be used, with the paper supply placed behind or below the unit. The entire mechanism may be accessed easily and the print head is very easy to clean. The parallel, RS-232 and USB interfaces ensure simple integration into existing systems. Plus, there is an optional variant with an integrated black mark sensor.