Hello.
New filament - Overture Fossil Rock PLA - causing interesting print failures. First few layers are printing good, and then around layer 4 or 5 I see something that looks like wave pattern in the lines (see the photo).
I’ve tried flow calibration test for this filament, but it seems like settings for “Overture PLA” were mostly okay, at least in this regard.
I wonder what else should I try? Every other third-party filament I used before was working fine.
Sorry I just saw I replied to the wrong post. I hope you got it all dialed in now 
Looks like over extrusion to me. Not a too-high flow rate thing.
Under extrusion because you’re going faster than the flow rate allows wouldn’t result in the raised ridges and bumps.
Over extrusion, too much squishes out to the side and when the extruder runs the next adjacent pass, where those bumps are there’s no place for the new plastic to go so it gets forced up over the previously extruded plastic and you get bumps.
But I can’t think of any reason that’d be related to the filament that’d cause that “pulsing”.
I am having a similar issue with TPU.
Would need more information on your TPU and settings to help.
If you can start a new post or put some photo’s up of your setting then you will get some user feedback
As it turned out, it’s not filament, because Bambu PLA Blue shows the same issues.
Here some additional details:
First 4 layers are really smooth
Then on the layer 5, which is marked as “internal bridge” in the slicer, things go awfully wrong (see the photos)
However, subsequent layers “mask” the issue and…
Whole printed part appear fine (minor stringing, but no big deal).
I repeated it multiple times, and saw it every time for this particular model. I haven’t tried to check internal bridge on other models.
That’s how it look like on Bambu PLA filament:
And that’s what slicer shows me:
What I’ve tried:
Dried filament.
Slowed print speed to 50% of default settings.
Did flow rate calibration for that particular filament.
Tried different filament.
Nothing helps.
I also found an old issue on github, opened for the same / similar problem:
SuperSlicer was another branch from PrusaSlicer, so it supposed to be very close to BambuSlicer.
You can also print this part with 100% infill and it will not do the bridge layer 
Just so you know on bridge settings and if you have to change them on another part
You will have to adjust your bridge flow ratio in Bambu Studio lower.
If using Orca Slicer you can adjust the internal bridge flow setting lower.
You can also change the bridge speeds as needed from 10 to 80 mm/s in Orca you can also change the bridge acceleration.
Look at your flow in the drop down menu and speeds to see the range your layer is @
Bridge Sample:
The current flow is @ 1 so let’s set it to 0.80 and the speed was 50 and we change it to 30 mm/s with 1500 mm/s acceleration the bridge layer will not be 100% perfect but should be flat.
The flow you can adjust in 0.05 + or - steps and the speed can be 10 to 80 mm/s depending on the filament being used.
Just my guess: table (or wherever the printer stands) vibration, instability.
