I'm surprised. Z6100 doesn't have a heater for curing. Are you talking about latex? In z6100, maintenance kit number 3 required at 800,000 sqf. The scan axis motor is included in maintenance kit #2 and should be replaced at 535,000 sqf run. If you earn Net profit of 0.5 $/sqf, then at maintenance kit#3 you should made 400,000 US$. Just buy brand new printer like z6600 (if you can D5800). A lot of improvement done. If you talking about latex, it is a whole new story.