Also, at the exorbitant price charged for OEM ink it is a shame to throw away a few cc's of ink each time the single use OEM cart is discarded. When refilling the ink remaining in the sponge means that less ink does a full refill and less ink is wasted. It hardly matters at $5 or less for two ounces of ink as compared to $13 for 14 cc's of which a few cc's are thrown away when the cart reads empty. Now that I think about it, the OEM user throws away more dollars worth of ink per cart than we use to refill it!