Hi , There is a refill clips from www.refillmarket.com to fill PG-CL 40/41/50/51 cartridges by manually or by their refill machine .
Mikling . I am assuming this also . My understanding is that the physical ink level is never monitored on these carts, only the set number of firings for the head being reached, and asking for replacement of the cart. (and loss of warranty if overridden )WhiteDog said:Mikling, I am assuming that it is best to perform this procedure before the printer asks you to confirm the nullification of the warranty. When the time comes I will try it on my ip6600d. Maybe someone will report on it sooner than that.