Hello everyone. I have been actively working with 3D printers to make molds for more than 2 years. All the machines I have are Anycubic. For about 2 weeks, a print quality problem appeared in the Anycubic Mega-S model, which we could not solve. While the printer prints smoothly up to a certain height, after a certain height it causes distortions in the model as in the images below. The efforts to eliminate the problem so far are as follows:

*The printer was completely disassembled and reassembled, loosened screws were tightened and necessary parts were lubricated.
*Nozzle has been changed
*Table adjustment has been made.
*Tried by increasing the extrusion flow rate from 100% to 105% and 110%, the result was worse.

-The filament we used was 1.75 MM PLA Plus (same problem continued with different brand filaments)
-Bedding temperature 200
-We print with a nozzle temperature of 60.
-Slicer: Cura 4.9.1

I would be very grateful if someone who has had this problem before and was able to solve it. Thanking you in advance.

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