Two sets of cartridge(s) are required for refills to work for your printer. You must alternate the one(s) from the printer and a back up 2nd set.
When refilling the cartridges for your printer there is a small chip on the cartridge that the printer remembers. If you remove the empty cartridge, refill it and put it directly back into the printer, the printer will remember that it is the old cartridge and not let your print. You can trick the printer by placing or alternating the cartridge with a spare one. This will cause the printer to forget the previous cartridge and allow you to continue to print.
Example. You will have two (2) black cartridges. When cartridge “A” black runs empty take it out and put in cartridge “B” black cartridge and then refill “A” black cartridge. When “B” black cartridges runs empty then take it out and put in “A” cartridge.
If you do not have a second set of cartridges Printer Refillers caries most models ready to go.