Layer separation? under extrusion?

hello, i have an issue which is pictures that i cannot solve
the issue happens at different heights despite of temperature and filament used (different pla brands)
printer is regular cr6 and slicer is cura

this is what the inside looks like, there is atleast some printing still happening in the gaps

Welcome to the forum, printerboi420.

While it looks like delamination, we probably need a little more info. Print settings including extrusion and bed temps are important.

Big prints like this may come out better if the printer is enclosed, too. Uneven cooling during printing definitely has a similar appearance.

i believe i solved the issue, which turned out to be 2 issues
first one of my wheels had a flat spot causing the axis to jump
sexondly my extruder spring had weakened which caused under extrusion