I have the problem with surface ironing of a 5 h print…
Here is the comparison without ironing:
Did you print that with a .6 or .8 nozzle…?? I think that might be your problem.
No, i printed both with 0.4
Found the wiki article:
Ironing | Bambu Lab Wiki
My problem looks like “The ironing flow is too small”
Does that mean i have to increase max volume metric speed in filament profile ?
I reduced it for the blue Geeetech PLA+ from 18mm³/s to 15mm³/s. That may caused the issue… confused.
Ironing flow
This is the amount of material to be extruded during ironing. It is relative to the flow of normal layer height. Too high a value will result
in over-extrusion on the surface. Too small a value can also cause the ironing surface to not be smooth enough.
The ironing flow is too small:
The ironing flow is too large:
No, it’s the flow setting showing up below ironing when you enabled it in the slicer (might need advanced settings enabled). Default is 10% or so (depends on layer height profile) but you can try 20 or 25%.
BTW it looks like the infill is showing through as well, you could try another top surface unless that disappears with more ironing flow.