Trying to print PETG honeycomb parts and this happens

I used black PETG to print the wall connectors. Both tries turned out the same, what i did in between was drying the roll for 6 hours in a sunlu dryer. Not sure what i am doing wrong here.

I am using this Honeycomb Storage Wall The Complete Edition Remixed by Justin Yu - MakerWorld and did not touch the settings, beside that i am using a 0.6 Nozzle with 0.18 layer height. Observing it, the print looks fine until the last couple of layers when this “crumble effect” starts. Any hint appreciated. (I did print other things hours before that and that worked fine, like the wall part in grey petg, and some red holder in PLA… ).

The PETG in question is maybe 5 weeks old and the original bambulab black petg.

Thanks in advance.

Frank

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