HP Instant Ink is a scam. What they don't make clear, is that if you cancel your Instant Ink subscription, your printer will stop accepting the cartridge. Even if its a full cartridge. What an absolute scam. Just do some research and you'll see tons of very angry customers. You'll also see that its quite straightforward to refill cartridges and avoid this extortion. I will NEVER buy another HP product as long as i live.