SV08 Ugly layers

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Suddenly poor print quality on two SV08's - solved with extruder idler gear

Since about 2 weeks I observe a great difference in print quality on both my sv08 printers. Despite using new petg filament from my trusted supplier the print contains large amount of blobs, zits and stringing. Also after the partcooling is enabled the top of almost every layer is rough I tried cleaning the nozzle, different filament, some tuning with temperature, but alas no big difference Maybe is the sv08 especially prone to colder weather conditions due to the high flow nozzle or is this …