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If there are more missing nozzles instead of less on the nozzle check print, and if they are not the same, then it's often not a clog but bad inkflow or more precisely air instead of ink, from bad sealing anywhere in the system, or from a bad cartridge. But if you are still on OEM carts this...

Would you reveal from where to where?

Interesting methods, PeterBJ - I haven't "pumped" on the wet paper towels yet. Could be helpful for dissolving dried pigments, because it's kind of push AND pull. But it won't reach far beyond the nozzle plate, I think. BTW the easiest and quickest, but not the cheapest, "first aid" would be a...

I have tried fotonic XG in a canon printer some months ago and the results were mixed... https://www.printerknowledge.com/threads/refilling-canon-with-oem-ink.10712/page-6 .. and the fact that it really seems to be one and the same ink for epson piezo and canon bubble jet still makes me...

Like pharmacist already said, you have to experiment. MK is often warm tone, while PK is mostly on the magenta or violet side. And further more these tints differ on different paper (which don't appear to be different white... until it is printed). That's why I would not do this with a ciss...

Take a look at the nozzle plate and the electrical contacts - no burned spots too see? I had dying canon heads with smoke already, without multiple cleanings but most probably with electrical failure. My opinion is that clogging, or any sort of ink flow issues, which is more or less inevitable...

Sorry for being slightly off-topic, this concerns refilling more than the PK-MK-Workaround... The cart seemed to leak out in the slot, so this or something similar I'm suspecting too. Some carts I had modified without dismounting anything, just by inserting the nail/needle beside the poppet...

BTW I once refilled a OEM PK cartridge for my 3880 with the new HD ink from a OEM cart for the p800. Sucked out of the p800 cartridge and injected in a "modified" 3880 cart. The "modification" (according to jtoolman), in other words poking the one way valve so that ink can go in, was probably...

Search for "ink selector" in the service manual, 32 places are marked. See p43 "2.3.3 Ink Change System", there is a lever moved by the "ink change motor". I think it's a mechanical blockage ... and there are videos where somebody is cleaning the whole damper unit (where the selector is mounted)...

Is that really so? Now this is my question - and my idea is the same as the suspected auto cleaning/flushing of the unused channel would suggest: periodical switching keeps the ink selector working smooth ... while long time of no switching don't.. It would be worth to collect the facts and...

Sure that makes sense, the ink selector seems to be an "achilles' heel" of these printers. I'm just speculating why that happens ., .. and because many users with such failure are telling that they only switched one time...after long time of no switch... it came to my mind that the true reason...

Probably I'm missing something - let me start with the last point: The 3800 (like similar epsons with two blacks) prints either with PK exclusively or with MK exclusively. So yes the printer output with hook on "glossy" will be different from the output with hook on "matte"... whatever type of...

Yes - I'm sorry, seems to be windows and german only..

Just to add: besides this there is another software solution which uses a digital camera instead of a scanner: https://colymp.com/ I have used this for quite a long time, before I decided to buy a colormunki. Which is certainly better regarding usage and results... but on the other hand colymp...

Yes I remember his short report too, and I think he did not suspect clogging of the nozzles but clogging of the small fine ink lines in the head which are leading to the nozzle plate .... And ISF is right to point out the sponge design of the carts... This is a warning to all who are going to...

Good summary, ISF. I just want to add one ink to the top of the epson dyes: - epson bottled ink T67xx (not T66xx/4colors)*** for 6 color printers with ink tanks, 70ml each. So fuji frontier or epson surecolor drylab ink is certainly the most stable dye ink for piezo printers. But among the 2nd...

Yes - a printer profile should be correct by itself, because the process of measuring the target and computing the icc is like a closed loop: errors occur probably before this process, while printing the target (wrong settings) or after, when applying the icc . So it may be a good idea to ...

Just one general point: more information what the buttons and options are meaning and doing, more user control (like defining the number of pages for one target, etc...) ... and as you say, more functions (.. like precondition target etc... and what about camera profiling? I haven't done this...

After first trials with "coloris" i must admit, I'm still impressed by the modern design, but the functions are limited and the printout size of the charts was a matter of luck.. So I'm waiting for the new version.

Indeed a complex test, and so it's worth to run it one more month. I use to be impatient too, but the fading becomes more visible after a month. Our UV bulbs seems to be not the strongest.. the real desert sun is shining on ISF's balcony...