Genuine OEM Lexmark Formsprinter 2391 Plus Toners
The Formsprinter 2391 Plus uses a black ribbon, and Lexmark rates the 3070166 by the characters printed at a draft setting. A page with only a few lines and a densely filled form use different amounts of that character allowance.
Toner Buzz carries genuine Lexmark 3070166 and 11A3540 standard ribbons for this model. Both belong to the printer's ribbon supplies, rather than toner cartridges.