First, forget about using non-genuine ink or refilling your Brother printer. You have figured out how to prevent the printer from recognizing ink cartridges other than "official" Brother cartridges. With that in mind, and given that they really work every time, I WANT THEM TO HAVE MORE INK IN THEM! I don't even use my printer that often, but I seem to have to replace it every few months. I actually wrote the date on the side to see how long they would last. 2 months! What a bang.