Hi all In my 10 years with the 510 the following procedure have kept me running:
1.Always add binder fresh from fridge before print job.
2.Return excessive binder to container in fridge when printer will be passive for 2 days or more.
3.Have a mirror placed by the head cleaner unit, this way you can always see the heads surface and wipe them with a cloth soaked in bleach.
4.Always print parts in color, does not matter if you use colored binder on 123 head, cause the parts get so much more solid printing with all heads.
5.After holidays, fill tanks with strong bleach and hot tap water, and suck thru the system with syringe at the head valves.
if you follow these route, your machine will run 1000 hours a year