Back in December I got my P1S and since I mostly printed Vases and plant pots back then, I decided to mostly use PETG.
That PETG as I now know was just Wet, which caused it to ooze out of the nozzle after the print, a Fact I hated. Since at the time I must've be pretty stupid, I decided to clean it by Heating the Nozzle to the max of 300°C and let it ooze fully out. It did work and the prints after it where fine... so I did it another 10-20 times until I got a Brass Brush and started just using that...
In retrospective, Filament really shouldn't be heated over its limit... because that probably Backed in the PETG really hard. Mustve been to the point where the nozzle clogged, getting me to cold pull it a lot.
Big question is, is there still Backed in PETG in that nozzle, even after 20 or so Cold Pulls? It definetly seems to underextrude a noticable bit. Should I use the replacement nozzle or look into other reasons for said Underextrusion? Thanks!
Edit: Did as suggested and tried swapping the nozzle, thermistor was stuck and getting it out broke it, replacement thermistor is gonna take till thursday to arrive, god I hate this machine
Echo others, nozzles are consumables, keep some on hand.
It's not unusual for PETG to ooze a little after a print in my experience, but it's been my experience that a quick brushing with a nylon or brass brush is enough, often I just knock off the bit that oozes out, haven't had issues with offset doing that.
Baked on PETG is awful, I've scrapped a v6 block that blobbed itself (my fault, probably loosened it accidentally after a nozzle change, I only use hotends that don't rotate now). Some solvents do work, but most of the stuff that dissolves petg is nasty, I don't recommend them.
You could try some cleaning filament, personally found it fairly effective at clearing partial clogs, good stuff to have on hand anyhow.
Would an ultrasonic bath clean off petg?
Tbh not sure, I don't have one to try with, baked on petg reminded me of enamel coatings. Solvents do work, just most of the ones I'm aware of for petg aren't pleasant, flammable and toxic stuff.