PostScript printers also require lots of memory. PCL 4.5 is about as basic as you get. Font sizes, styles, fills and orientation are fixed or severely limited. Variable dot sizes smooth out jaggies. Things foul up.
Paper runs out.
The wrong size mysteriously gets left in the input tray. Toner gets low. Power plugs and printer cables get knocked out by vacuum cleaners. Pe-ople forget to turn things on. When something goes wrong with the printing process, all the standard Windows printer spooler dialogues tell you is that the printer is idle or that there is an error.