Refill HP 950 and HP 951 ink cartridges. Our video demonstrates the use of the simple & clever refill tool QU-FILL professional. Refill kit from OCTOPUS: https://www.octopus-office.de/shop/en/printer-ink/printer-ink-hp/hp-950-951/4698/refill-kit-for-hp-950-951-with-qu-fill-8x-chips-and-refill-ink?sPartner=Youtube001 Ink quantities for refilling: Standard version HP 950 Black 23 ml HP 951 Cyan 9 ml HP 951 Magenta 9 ml HP 951 Yellow 9 ml XL version HP 950 Black XL 53 ml (by refilling the syringe several times) HP 951 Cyan XL 17 ml HP 951 Magenta XL 17 ml HP 951 Yellow XL 17 ml