No news. I noticed something - not excluding the aux fan - when using the quality profiles for fine or extra fine. In both cases I’ve never ever seen any artefacts on my machine. I am at 13days and a couple of hours of combined print jobs (see machine serial dialogue). Whenever I go for less quality it seems to depend on luck 
it’s not permanently happening but could also be the weather inside my room. Sometimes cloudy and smelly, oftentimes dark and usually no air to breathe… 
To add another point to this discussion, i’ll add my latest print, done solely to check if i’m also plagued with this issue, since i’ve got few of my prints exhibit similar issues.
All the tests prints i’ve done to see z-banding did not exhibit those issues, also done the belt tension calibrations and nozzle wobble & fitment tests, and yet if i print either large planes or rounded it shows under point light source (diffused lighting hides those defects).
So, in your expertise does this print matches the problem/issues your’e experiencing?
EDIT: look at the details on legs & torso
This print looks great in my opinion. You will always see (uneven) layer lines to some extend because it’s a FDM printer, especially when you hold a lightsource above your print. There are some holes visible but this has nothing to do with z-Banding. I also had these holes on of my prints and the problem in my case was the retraction distance. The standard value in Bambu Studio is 0.8mm and this is too high for most filaments I tested over the last weeks. Try to go to 0.3mm or 0.4mm.
Most of the times issue are as in those photos, and now that i think about it, it’s especially pronounced in the planes along Y axis, as if those two linear rods holding X gantry are prone to misalignment(?) due to the vibrations(?).
I’m not entirely sure, but i haven’t experienced as pronounced “artifacts” as these in rest of my models on the Y plane.
For now i’m happy with the ability i’ve gained with this printer (came from A1 mini), but seeing those artifacts somewhat dampens my enthusiasm, nothing left but just wait for better printing profiles
I know exactly what you mean. I feel the same. I started my 3D printing adventure with a Raise 3D N1 about 6 years ago so the step in technology was quite big for me but I just hoped for a bit…more. Don’t get me wrong, it’s a great piece of hardware and I really like the dual nozzles and also the new AMS 2 Pro but I just hoped it would be a bit more plug and play. At the moment I need to change a lot of things in the slicer to get a result that is on the same level like my Raise printer.
It’s been 3 days since the birthday party haha, did you get around to installing it?
I’ll go even further - when I use the quality setting ( 0.12mm Fine @BBL H2D ), I’m consistently getting almost unbelievable surface quality, as well as repeatable functional 0.05mm gaps between filaments extruded from different extruders.
Of note, my testing currently is with undried 2 and 4 year old rolls of PLA.
[I’ll post the test model and photos and video when I’m able].
Could you not experience a bug in the new setting of bambu studio 2.0 which is set by default: “smoothing wall speed along z”. Can you try turning that setting OFF (last line on the quality tab of BS) and see if that changes anything.
I’m having some Z-Banding for the first time in a self-desinged model. I oriented the model in a way I can print it with minimal supports. But I’m seeing visible z-banding where the geometry changes (and it matches the layer time in Bambu Studio). Any ideas on what to do with it? Would it be less visible with let’s say CF filaments? Im hesitant to try it again because its 170g of filament lol.
Check the fan speeds in the slicing results you may notice that the overhang fan speed is around the outer wall.
If that’s the case, you’ll need to temporarily adjust the fan cooling settings or set a fixed fan speed, along with modifying the layer time. It’s not the ideal solution, but it’s the best option we have for now.
I’ve already submitted a support request asking for additional fan settings in the Bambu slicer.
Please submit one too we need this resolved as soon as possible.
Is that Z band actually rough, or does it just look different in gloss color? It’s hard to tell for sure from the photo.
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Next, look at your flow rate and printing speeds on your part do you see anything diffrent ?
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Which wall generator are you using ?
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The order of walls, I understand you’re working with overhangs perhaps the IOI could affect the result on the H2D.
Yeah I can’t get it in the photo. It’s a bit rough, different texture. I’ll try to get another shot.
Did it happen on both the left and right sides of the part ?
Did you use variable layer height on this part? It doesn’t look like it, but photos don’t always show everything.
Yeah the same thing is on both sides exactly. Layer height is 0.20 all the way.
Did the speed or flow in that area change?
Speed and flow look exactly the same, the issue happens where I have drawn an arrow:
If I disable “Slow down for overhangs” Then speed and flow is uniform across the entire thing.
Slow down for overhangs:
Yeah, this can either be your friend or your enemy. Sometimes I disable it or increase the speed to a higher value to get more balanced flow.
Rotating the part to direct the auxiliary fan toward the areas with the most step overhangs might help. However, since the front and back appear to have roughly the same angle, your current orientation is likely the best option.
I think the issue might be related to the overhang and how long the PLA stays in the H2D hot end. If you can improve the flow balance and possibly lower the nozzle temperature maybe 5c it might help.
Keep us updated 
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You can also adjust the speed of the outer wall if necessary.
Although there were fixes for Z-banding and offset in Bambustudio 2, I haven’t noticed any improvement. I hope they get this under control soon. I’m slowly losing patience.
I’ve reset the H2D to factory settings. I’ve recalibrated everything, including the high-temperature calibration. The filament is also calibrated and dried.
Profil 0,20 Balanced