I am making this video on how to be able to reuse your ink cartridges, as I have seen way too many videos with a lot of misinformation about the subject.
I have not reloaded a cartridge in years, but I too remember the problem of having a newly filled cartridge installed, and the printer telling me the cartridge was still empty. Yes it still worked, but the newer printers are now not letting you print at all, unless you buy a new original cartridge made the printers manufacturer.
This video will try to explain why this is happening, and what you can do about it.
In this video I am using a Lexmark Pro705 style 100 ink cartridge for reference.
To find an RFID chip seller for your printer, just Google "ink catridge rfid chip for (insert your printer model)" and go.