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Hi: I am interested in buying an Hp officejet pro x551dw. For many years I have used an officejet pro K8600dn and k5400dn. We originally bought 4 gallons of ink and have finally used up the gallon of black. We print heavy volumes. The only problem we have had is replacing printheads every year...

Hi: I am interested in buying an Hp officejet pro x551dw. For many years I have used an officejet pro K8600dn and k5400dn. We originally bought 4 gallons of ink and have finally used up the gallon of black. We print heavy volumes. The only problem we have had is replacing printheads every...