Will using a non-HP or refilled cartridge void my warranty?
Using a non-HP cartridge or a refilled cartridge does not affect your warranty or HP support contract. However, if printer failure or damage is attributable to using a non-HP or refilled cartridge or an expired ink cartridge, HP will charge standard time and materials charges to service the printer.
From the official HP Officejet Pro 6960 All-in-One Printer manual, page 3
Have a follow-up question?
Answers from the official manual.
Common questions