My recommendation is learn to work on your own machine if you at all can. They are not very complicated when you get into them. I was lucky. I was talked into trying the 11-10 inks from Grimco, sort of a dummy test case for them and they promised to fix anything that went wrong with my machine. Well a lot went wrong and they, being true to their word, flew a tech to me and he spent a couple days working on my Roland 545. It turned out to be the best thing. He taught me how to try and recover clogged heads, how to replace heads that were too far gone, how to get into and use the maintenance mode, change dampers, etc. etc. He brought me a maintenance manual and really educated me. It's worth it to hire a tech to teach you how to change heads, once you know that you can do about anything. Anyway, since then I have done it all myself including changing 5 heads, countless dampers, encoder strip, cap tops, a pump, the ribbon cable...what am i forgetting? The point is not only will you save a lot of money but as long as you stock the spare parts you can be up and running again in a couple hours instead of a couple days (you can buy DX4 print heads direct from china for $650, dampers for $2, pumps, etc..all real parts and all real cheap) My printer is running constantly and cannot be down for 2 days. Try explaining to an internet customer who ordered a banner with next day air that you're waiting on a tech.