How to Refill HP 21 Ink Cartridges

By Catherine Johnson

  • Overview

    Black printer-ink cartridges frequently have to be replaced several times a year. Purchasing a new printer cartridge every time your ink runs low is time-consuming and expensive. With the wide variety of bulk printer inks that are now readily available, it is easier and far more cost-effective to simply refill your empty cartridge. A case in point is the HP 21.
    Quickly and easily refill your HP 21 black ink cartridge.
    • Step 1

      Turn on the printer and lift up the printer cover. Lower the paper tray to access the ink cartridges. Press on the edge of the empty HP 21 cartridge and snap it out of the cartridge holder. Place the cartridge on the paper towels.
    • Step 2

      Remove the HP sticker at the top of the cartridge. There should be five holes underneath.


    • Step 3

      Arrange the cartridge so the five holes are all facing upward. Turn the cartridge so that the single hole is closest to you and the remaining four-hole group is facing away from you.
    • Step 4

      Fill the syringe with 15ml of ink. Insert the needle deep into the single hole that is closest to you, making sure the syringe needle reaches the bottom of the cartridge.
    • Step 5

      Slowly inject the ink into the cartridge until the sponge, located on the inside of the cartridge, is completely full.
    • Step 6

      Reseal the sticker label over the holes. Hang the cartridge above the paper towels for several hours so any excess ink can drip out. Make sure the cartridge does not actually touch the paper towels.
    • Step 7

      Reinsert the cartridge back into its holder in the printer. Snap it back into position by pressing up and forward. Close the paper tray and printer cover.
    • Skill: Easy
    • Ingredients:
    • ACSI WJ1010 black pigmented ink
    • Syringe
    • Paper towels
    • Tip: Read your HP printer's user manual. Run the cleaning cycle several times before using your refilled cartridge to print.
    • Tip: For best results, leave the refilled cartridge to hang over the paper towels overnight.

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