I have 5 Bambus now, and they have all printed with fantastic quality, except my X2D, which has suffered from weird layer lines since I got it. None of my other machines do this, and the example below is printed with PLA.
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put that same roll of PLA and print the same model on any other printer, do the lines go away?
I am experiencing the exact same issues with the X2D. My A1 and P1S do not show these weird layer lines at all. The print quality on those is absolutely perfect.
Here is what I have already tried without success:
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Calibrations: All automatic calibration runs (flow rate, flow dynamics, vibration compensation) have been completed multiple times.
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Filament Cross-Testing: I used the exact same PLA filament in both the A1 and P1S, and it printed flawlessly. It is definitely not a material or moisture issue.
Since the X2D uses an asymmetrical dual-extrusion system, its mechanical design differs from the A1 and P1S. This suggests the issue is either a software/slicer bug specific to this model, or a mechanical issue unique to its toolhead or belt tension.
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I cannot find the video now but I had seen one a while back where layer lines were different where some parts were cooling differently because there were gaps and the different layers were cooling at differing rates. I dont know if you are referring to those specific layers I circled or other ones?
It’s a cooling issue and you can’t turn off the aux fans in the X2D. I suspect because an extruder clog requires pretty much a full toolhead disassembly, they don’t let you turn off the aux fans… If you look at the “layer time” on the sliced preview, you will see the lines correspond to where you see the imperfections.
At this point when my A1 mini produces better quality prints than my X2D that costs 5x as much then I don’t know what to think. I hope this is merely early firmware issues and not a fundamental flaw with the hardware. Mine is junk compared to my X1C.
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Yes. Printed it on my H2D and it looks much smoother.
can you post photo of both? was it the exact same filament roll?
My prints look exactly the same using petg with default profiles. havent found way to fix this yet
I am also getting a lot of strange extrusion artefacts, varying widths it seems, and quite a lot of slight underextrusion in top surfaces. Looks like they screwed up on the same extruder hardware that came from the H2 series for the most part. I think they can work this out through firmware. I hope at least.
Although it might take a lot of noise making from the comunity to get anything done it seems.
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Has anybody found a solution for this issue? I noticed play of approx. 0,1 mm in the printhead linear bearings. The Y-axis bearings are without any play. I have no experience with bambulab printers, but 0,1 mm is a lot, which is also quite more at the nozzle tip. From my perspective, this could lead to these random layer shifts.
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I’m also noticing the same thing, and trying to see if anyone has any tips or advice on what to try.
Same here and no easy solution so far. As few people recommended you can play with cooling settings or use some of the custom G code available in some topics to try better control over the fans.
I have same play in the bearings and contacted allready support, i made a short video where you can hear the noise of a clong by moving fast the head against bearings. Support answered me, all seems to be normal. How can a play like this be normal when the machine should print accuracy? 
This is never normal, especially since the the bearings on the Y-axis are without any play. I hope more people report this to the support. I am still in contact with them.
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Can you share this clip?
are the bearings “soaked” with oil?
My X2D is relatively new, but I’ve already cleaned it once and greased/lubricated the linkage and threaded rods, so yeah… the bearings should be saturated with oil.
I can’t upload the video here—this forum doesn’t officially support it—so I’ll upload it to YouTube and then post the link here.
I hope posting external links is allowed here in the forum? 
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Thanks,
Just checked with mine and I can feel some free play but it seems much more easier to twist the linear rods then to get the free play from the bearings. And it seems also the whole assembly is kind of twisting so I am not sure how much the bearing are playing. But does not feel like very sturdy to be honest.
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Unfortunately, it’s a bit more pronounced for me, and as you could hear in the video clip, it makes a noise when I tilt it. My prints aren’t really bad, but I think there could be problems here and there when the head changes direction—this play just feels unhealthy to me. By the way, I’m a car mechanic, and I think I’m pretty good at assessing bearing play. Anyway, I should’ve just gone with the H series.