Refilling the Hp15 & Hp45 cartridges take a little bit of practice. Remove the label from the filling hole underneath the cartridge and then push the ball bearing inside using a pen. Refill the cartridge with ink and then seal using another ball bearing and a bit of tape.
This cartridge is quite large so it can hold 20ml to 30ml of ink. Just remember to refill it slowly and to stop if it starts to overflow.
medeainternational 2 years ago