[QUOTE=Brian_S;11458]This is fairly normal for IJM carts, but can be the source of trouble in those from other suppliers. By trouble, I mean dribbles form the print head when you insert the refilled carts. But there’s some variation in this and it’s hard to be definitive. You definitely don’t want ink in the upper section of the vent passage. Sometimes I have some ink in the lower section and sometimes not. When I do, sometimes I get dribbles and sometimes I don’t. Go figure. But your problems were the opposite - you had no flow in one channel as I understand it. That is inadequate flow, not too much. I doubt that that’s caused by ink in the vent passage.[/QUOTE]
Actually this makes a lot of sense, and isn’t necessarily different from your experience. I am now convinced more than ever that the InkOwl carts I had had restricted flow. If the ink was unable to partially fill the air chamber section, that means it was unable to flow through easily. That would also mean that when inserting the cart into the printer, because the ink would be unable to flow back as the manifold nipple inserts into the cart, the ink has only one other direction to flow, and that’s down through the head. That would explain the dribbles you were getting.
Now for a completely hypothetical, impractical, and unadvisable idea. I’m going to assume that your R2880 worked well with the Epson carts because there were no flow issues. At the moment I cannot remember if you ordered new R2880 carts or not, and I also remember IJM doing some like testing with an old R2880, so I’m not sure if any of this applies. I wonder if filling your R2880 carts flushing with piezoflush, then leaving the head and carts filled with piezoflush for several months, doing a head clean once a week, would free up any of the flow issues.
I remember when inspecting the nipples of my R2880 manifold, I saw that only 1 out of four holes in the nipples were open. If this condition exists in the head, and also in places in the carts, it probably wouldn’t take much to block the flow. Unfortunately I no longer have a working R2880 to test any of this on. Of course, it’s not particularily worth doing either. But, pigment ink in a cart could create restrictions in the cart itself. My experience shows that it doesn’t take much of a restriction to cause major problems.