Adventurer 5m Pro - Issues with print quality

[the_link_keeper]

Hi everyoneI've been 3d printing for about two months now, and I've made some beginner mistakes but have generally been successful until recently. My prints suddenly all have the same issue, which is these weird issues with the layer lines, if someone could confirm what this is called for me I'd really appreciate it. I've purchased a filament dryer, tried PLA and PETG, tried going back to PLA. I've tried the built in benchy and basic cube on PLA to try to eliminate settings as the problem. I've also tried levelling the bed, swapping and cleaning nozzles, cleaning the bed itself.Is there any important hardware maintenance I should be trying? Sorry if I'm missing important information, but let me know if there is anything else I can provide.Thanks in advance for taking the time to help

[Bikeracer2020]

Possibly under extrusion. If you try Orca slicer there are several calibration tests built into it.

[Roberts_Clif]

There are many things that could cause this problem.

1. Nozzle could be damaged
2. Smooth Rods and Rod bearings could be dirty or insufficiently lubricated.
Great Bearing Cleaning video
https://www.youtube.com/watch?v=KQHugGSQd5M
Rod Bearing replacement
https://wiki.flashforge.com/en/adven...e-rail&bearing
Cleaning and lubricating these parts is very important to the smooth travel of nozzle.

3. Slicer settings could be wrong.
I remember once while testing the quality of different slicers somehow messed up the 3D Printers defaults. To correct this I reloaded my Printers factory default settings.

4. Filament could have excessive friction in Bowden tube.
5. Stepper motor current may need Adjustment.

Here are a few of the things I would start with, Please keep Forum informed as to your progress.
If may help others with the same problem