R2400 -- no 100% nozzle checks since installing Cone carts more than six months ago.
This printer has worked very well over the years with sporadic heavy use and many long periods of idleness lasting up to six months. It's always been able to recover with one or two cleanings. My clients stopped wanting prints so I've just been printing for fun and gifts. Haven't enough need to buy a new printer and have access to well-maintained R3000s during winter months.
Have read directions and followed them, watched videos, purchased and used the flush kit, printed purge files and the Qimage "head un-clog patterns". Nothing seemed to make much difference.
Most of the time it's been the two magentas that have the problems but it's a bit like the Whac-A-Mole game -- one gets better two others act up. Have used a full cartridge of some inks in this process.
(During the middle of this, the "Your printer has reached the end of its useful life" message from Epson appeared and I reset it with the Epson software.)
On two occasions I've had instant cures of LM and M from bad patterns to perfect ones.
One came about for logistical reasons -- ran out of LM so traded a bag of carts to a local refill store for an OEM LM cart with ink from the "2nd largest ink maker in the country". The other was a recent test replacement of the Cone cart with a brand new OEM one. On the first nozzle check the M was perfect but C lost a whole line.
During a refill session I recall having the impression that the M ink seemed more frothy than the others but it did look normal after awhile. I'm not a technician and there's scant evidence here but it seems to indicate that if I buy a full set of OEM carts or refilled OEM carts, I could again print with few problems. Any other suggestions?