Crazy idea here: How about not monitoring the ink at all?
Why does the printer need to know? It’s not like it’s going to explode from not having fresh ink anyway. Just put the ink in a visible container where the user can look and see if it being empty is the cause of a shitty print.
I’d buy any printer that doesn’t attempt to monitor the ink.
Maybe so people know to buy a cartridge so it’s on hand before the one runs out, so you’re not having to run to the office supply store in the middle of an important print job? But that’s more of a convenience thing, not necessary.
Yeah, just make it work like a car’s fuel tank. It has a gauge to say how much is in it. It has a hole so you can add more. Some cars will guess how far you can drive, give or take, based on how much fuel is in the tank. If the fuel gets very low, a more obvious warning will pop up in case you weren’t watching your gauge. But otherwise it just keeps driving in the meantime and if your car needs high octane and you give it low, it will try to run it anyways and if it fucks up the engine, then that’s on the user.