Wouldn't all new printheads cost more than the machine itself? These printheads are soo expensive that I'd be trying everything possible to recover nozzles before replacing printheads! You're going to need to buy consumable parts at some point anyway, so why not replace your pumps and filters now, especially if you don't know the maintenance details of the machine? Worst case, nothing improves but at least you have spare parts so nothing is lost.