Is the 4.9km of filament enough for brass 0.4 nozzle?  

Is the 4.9km of filament enough for brass 0.4 nozzle?

Hi

Since few day i can observe on MINI+ printer some stringing which affects the quality of prints. So my first try was to check the filament, so i did the cross check on the second printer and there was 'normal' without the issue. Then i tried fresh new spool of filament still the same. I reopened the extruder if something is wrong with it, all good and clean, anyway i did doubre check in the following day to confirm. I checked if i have skew plate, but anyway geometry is not affected. so i did the cold pull, but it's clear' i repeat, and also used cleaning filament just in case. I checked the ptfe tube in the hotend part, it's clean, not deformed. So at this moment i don't have more experience to narrow down the issue. Only thing i spotted is that extruded filament from nozzle has some little teeths every now and then, between one - two centimeters, more or less irregular pattern. I can feel the diffenece in shape in fingers. So in the end i concluded that maybe nozzle needs to be replaced?

It's three months old printer, and i printed some 4.9km/15kg PETG on it. So far no major issues with the printer.

Anyone has idea what else i have to check, in the manual it's written that nozzle should last houndredts of printing hours... mine i think has 1320h. And 90% of it is printing PETG.

thanks