Found this thread as I’m experiencing exactly the same issue. Although there is very minor z-banding on smooth featureless walls, it’s far worse when there are holes or depressions which cause these horizontal ghosting bands.
I’ve literally tried everything already mentioned in this thread including the infill/wall overlap from the default 15% in increments all the way down to -5%.
Nothing makes it worse or better. AP and flow calibrations both automatic and manual with different values circling around the apparent manual optimals. Different speeds down to very slow. Different numbers of walls. Different infill, inner wall, and outer wall ordering.
Belt tensioning. z-rod vertical free play check (none at all).
Brand new hot end and extruder. No difference.
Different filament types, temperatures, etc.
Hundreds of test prints. Nothing changes it. The sad thing is I have a 6 year old QidiTech one-x that prints the test cube with the hole through the center perfectly but my brand new x1 carbon looks like craps.
Tech support has been making suggestions of different thing to try but nothing has worked.
What’s very strange, as you said, is that every time I change a parameter, the problem doesn’t get better or worse. It’s a very strange constant… problem.
I too wondered if it was firmware but then you have @walidezza saying he and his brother have the same printer with the same firmware version and his brothers prints are perfect and his aren’t when comparing the exact same files.
I also have this problem. I’ve reduced the flow rate and infill-wall overlap and got slightly better looking outer walls but there is still banding/ghosting right after a hole or feature.
Came back to see if there were any updates and it’s disappointing to see there is still no resolution. But I can tell you my (4) Prusa MK3s after almost 5 years are still going strong and are printing perfect prints every time - unlike my past experience with the X1c. BUT Don’t get me wrong I do enjoy my X1c AND it has made some amazing prints and I must admit it has been working pretty much flawlessly after understanding the hardware and slicer nuances and getting it dialed in - however it does not work for what I originally intended it for - to be able to print my black enclosures much faster and with consistent gloss-like sheen - my only other thought is perhaps a different type of high-speed black filament might work ?? don’t know if anybody has tried that or not?? - The other option as it has been stated - is to print the enclosure without the through holes but that sort of defeats the purpose and risks me damaging the enclosure - I have another post on this forum that is completely documented with everything that I’ve tried and still no avail and even Support has verified it is not possible to be honest they don’t seem to care.
I’ve been trying to work through this with PETG-HF on my P1S. The best result I’ve had is from changing the wall print order to outer wall first, but I’m still getting 1 or 2 very noticeable layers. Another thread on here recommended using Ocra Slicer and the “Precise Wall” option. Trouble shooting has paused as I’ve run out of filament and am currently waiting on more to arrive.
I’ve also had this problem with ABS from Bambu, Sunlu, and eSun. I know don’t have this problem with PLA, with either Bambu, Hatchbox, Overture, eSun, or Sunlu PLA.
Once everything arrives and I dry the filament I’ll give it another try. I’ll also try printing in my X1C, which I haven’t been able to yet as it’s been in use almost 24/7 printing Halloween inventory.