Depend how much you print, my hardly problem over 3yrs now. Almost time to replace belt, other than that keep printing.
My other HP waterbase Z6100 over 5yrs just replace mainboard. This mainboard replace because I using third party ink on my Z6100 from KAS in from SCal. Do not use their inks, the ink chip fail, that make printer work harder and downtime too. We were use their ink early last year cost tech over $1,000 which we never pay in 4 yr. with original ink.
Bottom line KAS and SAM-ink = SUCK DONOT USE THEM!