Platinum Printer Member
- Oct 27, 2005
- Reaction score
- South Yorks, UK
- Printer Model
- Epson, Canon, HP... A "few"
I'm sceptical that it's some kind of damage that's causing this issue. All three of my Canon tanks have done it. Different models, different heads, different ink processes, etc. And they all do it. I'm inclined to believe it's a design flaw.
Full disclosure I've only had 5 different MegaTank printers and 2 of those have never been even turned on so I don't have the same breadth of experience of you but I'd be inclined to agree that their system is flawed. The question is whether or not it can be fixed.
On this I'm going to disagree. Any air ingress into a CIS system (whether it's Canons MegaTank, Epson Ecotank or some third party installation) is a bad thing and should not be happening, particularly for one that is designed into the printer by the manufacturer.Canon's bad about stocking replacement heads in their store and every other option is massively overpriced. I suppose if I get into production work soon I'll have new heads ordered to have on-hand spares. But even then it's not worth replacing a working head for a problem that seems universal and can be fixed with maintenance prints. (Which I have to do anyway to stop wasteful auto-cleaning.)
Coming back to the. How do we fix it?... To my way of thinking the problem is likely to be a poor seal between the printhead inlets and the carriage lids but the interface between the two is overly complex and doesn't lend itself to a simple fix like a gasket. Looking closely at the ink outlet (in the carriage lids) the seal seems to be internal so any crud that gets in there will allow air ingress and pigment black seems the most likely to create that kind of detritus. I wonder if there's any mileage in trying to flush the outlet hole gently with some cleaning solution via a thin needle and syringe (with a sponge or absorbent material underneath to catch the fluid). Hasten to add I don't mean sealing the needle against the outlet but just sort of jet washing it just around inside that outlet port.