"Bubbles" and "holes" problems (Ender 3 Pro)

Hi,

After a lot of researches about my 3D prints defaults, I haven't found anything !

My problem is that I have EVERYTIME kind of bubbles and scars on my prints. I tried everything ...

I've change PTFE tube and the fittings (PC4-m10 et PC4-m6).

And about Cura settings, I tried so many things ... temp, print speed, retraction, flow rate, resolution, ...
You will find some pictures to illustrate my problems ...

Help please, I really disappointed ... And I want to precise that my extrusion is perfect and my Z too ...

Here are the images and my Cura settings :

https://drive.google.com/file/d/1Qnv...ew?usp=sharing

https://drive.google.com/file/d/1mI7...ew?usp=sharing

https://drive.google.com/file/d/1jPD...ew?usp=sharing <----------- Download this and open it with your web browser !

Thanks a lot !

check the belt tension and whether or not the gears on the stepper motors are slipping.
The white print is awful - assuming it's supposed to be a straight square column.
The yellow print looks absolutely fine ?
so not sure what the exact problem is.

Thanks for your fast answer.
My belts are fine and i'm gonna check the motors !
The yellow print is not fine, look at every "holes" on this one :(.