Rough layers on tall part
I printed a spool holder and I'm quite satisfied with it over all. However, I'm seeing some rough layers, especially at the higher layers as shown in the pictures:
Is this normal? Printer is MK3S, filament is Add:north White PETG, printed at 0.20 layer height with the standard Prusa Quality profile, 2 perimiters, 15% infill. Printing temp is 240 degrees.
Please note that the lighting is particularly unflattering here to show the problem so it doesn't look quite like this in reality.
RE: Rough layers on tall part
Print speed might be changing as the part builds; check the slicer preview to see how significant the change is. Generally, surface roughness changes as a part builds is from part wobble. I doubt that's happening on your parts because I don't see the effect on the rod, where it'd be worst.
On the other hand, my calibrated eye ball thinks any top-bottom variation is imaginary: i.e., I really don't see any differences on your part. I do see some wall variation that looks like positional slop, e.g., belts a tad loose.
And, fan speed may have an effect: near the bed the fan is funneling air across the bed and the in effect get more cooling than when the extruder is higher up.