Review on 🖨️ Combo Pack: Compatible Toner Refills + Chips for Konica Minolta MagiColor 1600W, 1650EN, 1680MF, 1690MF Printers by Brennan Buckley

Very easy to use but make sure to wear gloves and be in a place where nothing can get on powder. They recommend removing all of the old toner, which is good for the first time so the marks don't mix, but after that I wouldn't worry if you're using the same refills. You still only get a certain amount of chip usage. That's why you get a new chip.