Have a CPAP Machine? Beware of GAME OVER

Some printer cartridges have that planned maintenance schedule: a countdown chip in them that wont allow you to refill the cartridges. they will report the ink is empty and stop working even though you refilled it and it should be good for another 4 months. Found 2 workarounds: one was to buy the chips alone from ebay and just rechip the refill. other one was more clever. Take a new one and stick it in and boot up the printer, while the unit is on, stop the carriage and take the new one out and put the old refill in. It will not notice the old chip and will continue to print. Just dont turn the printer off. Later ones just gave you a nag screen that you could blow through. Even aircraft motors have a run time before rebuild, right? Wouldnt want that to fail at 14000 feet.