i used to refill cartridges from a kit way back in the day.

The problem ive noticed refilling is the fact that they never really work the same afterwords.

But at the same time, the ink dispense tubes to the printhead like to plug up and cause streaks/lines in the paper.

And then the printhead itself can go bad, ive seen them where they just spill ink sitting still too. Lots of things go wrong.