3D Printing Forum

Good morning all
I have a Longer lk5 pro and for a few weeks I have been experiencing some printing defects: the first layers develop malformations only on some edges of the print, that I can not fix by changing the temperature,cleaning the nozzle, changing the speed or adjusting the leveling of the bed. I also tried to change the filament with a new one, the result is the same.
Once the first layers have been printed the next layers are perfect. I attach photos:

Have you gone to the Teaching Tech Calibration site to dial in the esteps and the slicer flow settings?

https://teachingtechyt.github.io/calibration.html

At first glance it looks to me like you are over extruding a bit

Thanks for the suggestion, I'll try to follow the guide you linked to me.
In any case, if it is an overextrusion problem, shouldn't it occur on all layers?

That's a good point It could also be that the better layers are when the fan is on
I always start with temp towers, flow rate and retraction tests for my materials