I would have thought that refilling an ink cartridge would be a simple matter of injecting the ink into the reservoir, but after I did it, my HP printer started warning me that the cartridge was "unauthorized" or something like that. And a week later, it quit working. Yesterday I filled my neighbor's "Canon" cartridges and one of the YouTube videos I watched said you needed something called a "chip reset tool" that supposedly "did something" to the cartridge. Maybe to fool it into thinking it was new?
Have manufacturers "done something" to prevent and/or discourage average people from refilling ink cartridges?