Here’s a file printed with my A1 Mini that has a ledge. There is absolutely not a line on it at all. On the h2d I would have a line going around the entire part at the top of this ledge. This part is 2 mm thick so there is infill on the entire bin. Small amount of infill, but it does have infill. Not only that I would have a line going around at the top of where the magnet recesses are. On the A1 Mini that part is pretty thick there, and I don’t have a line.
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There is a line, caused by the same issue. For the ledge yes it’s not as obvious but in my own test, the H2D performs better than the A1 mini with cooling lines.
Compare that to my other pictures. My other pictures look like S**t. The prints from my A1m look like like they should come from a machine that cost more than the H2D not 20x less (10x less if not the laser version).
a internal feature is different from an external feature. An external feature is much easier to deal with. the part you posted would print fine on h2ds as well I think
Here you go. Looks great. Some lines only line up with other parts on the build plate. Never once had a part look this bad on my A1M, ever. And some of those lines are lined up with outside ledges which are not present on the A1 mini part
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That looks terrible. There is an issue somewhere. For me its not every part or every print. But its always on a geometry change when it does happen. So its either the printer (Firmware, sensor, cooling, idk) or the slicer. But i never had so many prints come out bad. Some come out beautiful and then the next is terrible.
Terrible is still a nice word compared to the outcome. 
I didn’t print this with fine or extra-fine profile (takes ages). Therefore, I cope with it for this little Michael Knight 
I’m thinking since between this and the balls of PETG i’m getting, their print profiles are not the greatest for this printer yet. When my right nozzle has half the airflow of my left nozzle, I don’t know how you can possibly get a good print profile for a filament that needs cooling that would work on both nozzles the same.
Crazy difference on air from left to right. Makes it tough to tune filament that needs cooling without individual profiles for left to right
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NeedItMakeIt’s channel on YouTube features a video on community created fan ducts and how he tested this. Absolutely recommended watching this. No offense to your test, just saying and worth a subscription if not already done 
Ill have to check that out
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It would appear I’ve also joined the Z-banding club Printed using Bambu PLA Basic Black (dried), using HF 0.4 nozzle (auto flow dynamics and auto bed leveling). Used a deflector for the AUX fan, so there was no cooling coming from the side. I did notice that the very edges of the build plate were ever so slightly bending upwards (1 mm at most). Could it be that this particular model was actually pulling up the build plate? The inside of this model has a honeycomb pattern. I did notice the same banding on the very outer edges of this pattern as well (closest to the walls), but these lines disappear towards the middle. Model is this one.
Probably unrelated, but I guess in order to hide this line I would have to print using Outer/Inner?
Got mine H2D and i have same issue, support told me to tighten both extruders back ceramic plates screws, i have done the beld tensioning adjustment and re calibrated printer again too but without success, bamblu pla basic dried for 8hours inside ams 2 and bambu pla basic external give same issue to both extruders
I am not allowed however to post my media file (picture), but having same kind of problems.
Can someone make a test file. So we can test if it is all machine or just a couiple machines. Rule out software vs hardware. I see no banding in my prints and i am more then happy to test.
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A video i just stumbled upon. I will try this out too. I never opened the door or the lid when printing PLA with my P1S and it always comes out perfect. Of course it depends on where you live and how hot your ambient is.
I will try this out because for me , especially with petg prints, most banding problems comes from too much cooling.
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just replying to myself > I sent the project file / gcode to the support team. they’ll check now what and where I screwed things up. gonna keep this thread posted… 