This is one of those posts that upends conventional wisdom, and Jeff and I have been puzzling over it:
"What's interesting about the 3880 is the back/forth push/pull of the ink during the movement of the head. This works quite well at maintaining agitation in the printer (simply by printing a sheet every once and a while). It seems to agitate much more during the printer process than even the cart-over-head small formats ironically."
In a couple of posts in the above-mentioned thread from 2015:
"BUT - if we let a printer sit for 3 unexpected weeks whether Epson OEM, or ConeColor Pro, or Piezography inks - we do not hesitate to run an INITIAL INK CHARGE or three Power Cleans (on X880 printers). Why? Because of our high standards. That is the best practice." and "With this in mind - you would want to shake your carts every two weeks. You would want to print with a large format printer regularly so that ink does not remain in the ink lines for more than two weeks."
I'm not trying to be a smart-alec here, pointing out apparent contradictions. This is an important point. Conventional wisdom has been that the head going back and forth on a carts-on-head printer was enough to keep the pigment in suspension and prevent sedimentation (although even then there are limitations in my experience), but not in an ink-lines and dampers printer. Nothing in Jon's posts two years ago suggested that print head movement in an ink-lines-and-dampers printer alone prevented sedimentation. If it did, then Jeff should not have had sedimentation in his dormant PK line.
Are we missing something? Is this a change of position?