In my first job they had about 20 printers
Almost all of them were unique, different manufacturers, media, networking and printing technology.
Each one needed a different way of fixing or maintaining, and I am sure all the controls resembled more of a Hasbro Bop-it than an enterprise device. Bloody push, pull, turn, open, shut, lift, click, lock and all different. I don't know how I managed to learn all the different printer skills and not confuse them.