In the working world, toner is one of those items that separate the sheep from the goats. Sheep complain about the printer or the copying machine when the pages are too light or they get an error message about toner. Goats get the job of replacing the toner.
There is an art to installing toner. Too light a touch and the thing won't go in right. Too heavy a touch and the thing will get bent. Then there is the matter of recycling the toner. Sometimes the unscrupulous goat will pocket the old toner to get a discount at Staples.
Ever since I have collected a W2 form I have put toner of one type or another in a machine. I have put toner in photocopy machines, microfilm machines, computer printers and scanners. I always end up with black on my hands, my shirt, my tie, my trousers. Luckily if you act quickly you can get most of the toner off.