Research and development are often cited as the main reason for the high cost of supplies for inkjets and laser printers. HP claims it spends $1 billion a year on research and development, and holds over 4,000 patents alone on consumables, like toner cartridges for laser printers, and, of course, ink cartridges.Mar 26, 2021
How do you change the ink cartridge on a HP LaserJet 4000?
https://www.youtube.com/watch?v=IOCqf2Q1VuY
Does HP laser toner dry out?
The printed pages from a laser printer showcase quality images and sharp, clear text that's ready for myriad uses. Toner doesn't "dry out" because it's already dry. Unlike printer ink, toner cartridges don't run the risk of drying out since they're already in powder form.