@GM_Frank This is so awesome! Thank you for your advice. This fixed the problem for me.
Left side: Smooth coefficient 80
Right side: Smooth coefficient 0,1
Even at smooth coefficient 1 I had some small holes remaining. I had to go down to 0,1 to make them all disappear.
A lot of layers now have this flow distribution (speed looks the same)
The accelerations and decelerations make sense to me.
However, there are also a lot of layers that look like this:
Here we have sudden decelerations for some reason. Flow goes down from about 7 to 0,7 in an instant. This will show on the print, as seen later. The slicer misses the point where it should start decelerating but it keeps on accelerating (or keeps the speed constant, hard to tell from the color plot). Then, when it comes to the overhang, it does an abrupt deceleration.
This also shows in the print.
The defect pattern on the phyiscal part matches exactly the abrupt deceleration pattern that can be seen in the slicer:
The smoother the color changes from green to purple, the smoother the deceleration is. some layers have a really long purple streak (smooth deceleration), while some layers stay grean until they suddenly change to purple).This sudden change in flow can’t be done in the real world, so I get a blob on my printed part.
Is this a bug in Bambu Lab? I can think of no reason for doing sudden decelerations every few layers while I specifically asked for smooth ones.