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Outstanding information! Thank you, Peter, that's very helpful. Someone (perhaps you) has previously posted here a link to the druckerchannel.de guide, and that's what I relied on for disassembly. The process wasn't at all difficult, just messy. I seem to have shrunk the top layer drain...

I have my IP3000 torn down to clean the drain sheets. It finally started giving 8 amber flashes, and the EEPROM test print said the drain sheets were at 94.9%. It creaks when it raises the printhead. Otherwise it's working well. With the printing engine sitting on the bench, this seems like...

> Isan't it time for a new printer. Thanks, but not really. I prefer older printers. I don't need or want new-fangled features like wifi printing, cloud connectivity, and printing from my mobile phone. I'm fine with just a USB cable, or even a parallel cable. I like being able to access...

So it sounds like the printhead nozzles are firing during a purge. It's not just ink being passively pulled through the head by the purging pump's vacuum. I did not expect that.

Thanks to all for the guidance and the generosity with your time and knowledge. I'll keep printing and see how it works out. Since getting my first Canon inkjet, I've spent some dozens of hours lurking here and in other forums that discuss the care and feeding of these somewhat finicky...

Maybe I'm too cautious. I'm a relative Canon newbie. Until early 2017, I'd owned only HP and Epson inkjets. The HP seldom clogged. The Epson was partly clogged most of the time, but printing in that state didn't damage its piezo printhead. My first Canon in 2017 was a nice low-page-count...

Well, this has been an adventure. When I put the cleaned and blow-dried printhead back in, it had no pgb at all. Colors were barely there. After 2 purge cycles, I had streaky color, but no black. At 5 purges I put about 8-10 drops of Windex on the outlet of the PGB cart, which I think may...

Oh, absolutely, the printer makers see most printer users as suckers. But not us, I suspect. We're more adversaries, because we're actively subverting their business model by doing our best to pay them less (or nothing) for their ink. That said, I'm sure they see commercial refillers as...

Much less locked down, too. These days, Canon (like most printer manufacturers) seem to view their customers somewhat as adversaries. :-(

Thanks again for the idea! Is it the PGI-5 ink composition that maintains ink flow better, or is it the internal structure of the cart itself, or is it both?

Oops, sorry. That's my basic frugal nature coming to the fore. :-\ I'm quite sure I used matte photo for that print. However, I'm running Linux here with the Gutenprint driver, not Canon's, so I can't warrant that it's using the inks the same as the WIndows or Mac drivers would. I booted up...

Tthanks for the guidance! I flushed and refilled a BCI-3 PGB cart and fitted it just now. No improvement, sorry to say. Note that what look like vertical bars in the color bars of the nozzle check are actually ghosts of the printing on the back of the sheet. I ran 3 black only head...

Peter, thanks. Sorry for the delay in getting back to this problem. Using an irrigation syringe press-fitted in the filling hole, I ran something over a liter of water through a recently replaced BCI-3 PGB cart. The water coming out was still just slightly grey. I followed that with about...

Greetings all. Back in March, I replaced the printhead on this 3000 with what may have been the last new one here in the states, mostly to clear up problems with color cross contamination. The new printhead also fixed a few spotty missing segments in the PGB. The dye color is still working...

> I bought three ‘new’ BCI-3eBK units, realizing that surely they haven’t > been manufactured for years ... The Canon website shows both BCI3eBK and BCI6 multipacks in stock. https://shop.usa.canon.com/shop/en/catalog/bci-3ebk-twin-pack...

"the sponge when not completely saturated holds back the ink and creates a small level of negative pressure on the ink channel, and this can cause ink being sucked back from the purge unit in the idle position..." This sounds like an argument for refilling all your carts as soon as the printer...

That's an interesting idea, but wouldn't you think that if the vent weren't admitting enough air, you'd get ink starvation while printing? On the other hand, if the vent is allowing TOO MUCH air into a cart, I can see how that cart's ink might flood the purging pad while the head is parked...

A new (I hope) printhead and we're back in business: I couldn't find much on cleaning the purging pads, so I winged it: dripped Windex on them with a syringe, and sopped it up with cotton swabs. Even the pgb is looking good now. Previously I thought the few missing segments might be ink...

Laser is the undeniably superior solution for black text printing. You can forget about head clogging and other hassles. If you don't need printing for a month (or several), you just leave the printer off. All is fine the next time you use it. Laser printing doesn't have to be costly. Toner...

Thanks, ISF, that sounds like a good plan.