A salutary story, only very slightly off topic:-
Some several years ago in UK I bought a colour laser printer for business use. It was a Brother, and spectacularly cheap! It ran for about a year, with heavy use, with no problems, until it ran out of toner. This thing has four enormous toner cartridges, one for each colour, and they cost, then, £90 each! The printer only cost £700!
Run on another year, and we need another set of toner. I saw advertised a DIY toner refill kit, for about £20. Ordered it, delivered no problem, opened the package, and did what no-one ever does: read the instructions!
"1. Before attempting to refill a cartridge, check its weight. DO NOT attempt to refill if it weighs more than xx grams. The printer will start to show empty when there is still 60gms remaining. Wait until the print quality is affected before refilling."
A full load of toner is about 160gms, so every time you change cartridges when the printer tells you to, you are throwing away ⅓ of your toner!
If you refill your own too early, you will overload the cartridge.
The printer ran for another 4 months before I needed to refill the black, the colours ran for more than a year!