with the first batches of 4900 epson had issues with micropunctures within the ink line assembly altough they never admitted to this, a rare used printer will not just occasinally build up pressure in the ink lines to maintain ink flow but it will cause more pressure build up or at least more frequent, which leaded to these microfractures in the ink assembly.
basically what an technians did when the printer was still under warranty or other kind of SLA they changed the dampers, the printerhead but never the inklines and the complete ink line assembly since it not a typical on side/ field repair. this kind of maintenance was only done at specific epson certified repair shop and companies.
with the 2nd iteration of the 4900 and most of the "old" ink line system as a replacement parts gone they changed the complete ink line harness and covered it with double heat pressure sealed mylar (AFAIK)
The problem is, if the pressure dosent keep up ink cant flow, if there is an air gap the pressure level drops and tiny bubbles start forming which effectively renders the the phyiscal capilarry effect useless and voila ink channels sporadically drop out and come back to life even within printing a A2 sheet.
I NEVER had issues with ANY 3880 or 3800 of this kind due to the fact that the pressure and ink system is total differnt in these "desktop" printers
Jose did a pretty good job with is many "maintenance" and tutorial videos how to keep your printer clean so that the dampening system can do its job by creating an underpressure to suck the ink out trough the printhead, dampers, ink line and finally from the cartridges themselfes.
I had one of my 3880 for 7 month on storage with refill carts 80% full on storage (about 15° to 18° degrees Celisius) very low humidity since it was a basement storage room located next to the building boiler room. after some renvoations and further print job i took this dusty beast back to my office desk did only 1x normal head cleaning and boom
100% nozzel check perfect and concistent trough about 70 sheets of a3 plus paper
god, I love this machine
the printer had a major overhall: new dapers, black ink switching, dampers etc. but this was 2 years ago
but it safe to say that i will get the p800 the second the recommend retail price drops from 999 EUR to a more competetive amount, since I have to spend additinal money for the roll paper holder.
finaly since the P800 will come with "starter" ink cartriges that have a significant amount less ink than the normal retail cartriges I hope chinese refill developers will come with a good solutin in time
