PET-G is the main filament I use. I can achieve high quality of my prints with my Prusa i3 mk3s printer. Recently however, I've recently changed my nozzle from the default 0.4mm to the 1.2mm. I watched the online video tutorial on how to do it properly and did the whole process carefully.
Temperature: 250 °C/100 °C Speed: max 200 %, but results are the same even all the higher ones . Layer height: 0.35 mm
With my first print (and the next ones too) on the new nozzle I noticed lots of under-extrusion with infill (holes). LOTS of stringing although I've increased retraction. What's the reason ?