Central Europe. I'd say it's not too bad, but the printer is in a basement which tends to be humid...

Guess I have been repeatedly too stupid to buy parts up to specs and then trying to solder them together, which failed. By that, I destroyed the original equipment and got no working replacement in place.

Weeeeeeell the last time when I tried to replace the hot end, I screwed up so hard the printer was not usable any more after that 😂

Unfortunately, the temperature variation still is above 3° C.

Ok, I never heard of that and read into it. As this is there easiest thing to do, I'll do this ASAP and see of it works.

I already got myself a dryer as I suspected that. But this occurs in multiple filaments, brand new and older ones, different brands. To me it somehow feels like this is not the root cause... But I'll keep an eye on that.

The filament is brand new, I also tried other brands and types of different age so I assume it is independent of the filament.

That is true. That is why I bought that filament drying chamber. I'll keep an eye on that.

Well, I know that popping sound after having a one year long print hiatus, and cannot hear that while printing now. Thank you for the recommendation of ordering two!

Well, the PETG is brand new and I use a heated chamber for the filament, so I really hope this is not the case. But as the setup sits in a basement, I'll try to check that, too.

Yeah, that's what I observe in octoprint. Do you also know how to fix?

This. There are things which are extremely hard to cope with without professional help. The meds will not walk the way you have to go, but maybe pave parts of it.