How to do a quick fill of an HP 21 Printer Ink Cartridge

This is what we do, about 3 times a week because use quite a lot of ink. We generally do a 5 ml top up (like this one) rather than 10ml, which does, occasionally, leave you with ink all over the room (well, all over your hands, anyway). We highly recommend starting with black, and when you are used to it, moving to colours. It’s much easier that way, and we speak form experience.


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