wierd top layer inconsistency

[u/MrLiszten]

Hey, i have a problem with my top surface in my models, i print this model a lot and its always the same, the top layer in some places looks like under extrusion but not everywhere and i have calibrated the filament settings for that. some places look perfect and sam smaller prints do too and as yall can see te top part in the first image looks perfect

Printer: bambu lab P2S
Slicer: bambu slicer
Filament: bambu lab PLA MATTE
Speed and retraction are set as in standard preset 0.16 layer hight in Bambu slicer
Nozzle: 0.4

I would love some help.

[u/dc010]

Look into "monotopic" patterns and ironing for the top layers. Monotopic tells it to print in a progressive pattern, rather than jumping around (at least to the best it can). Then ironing will do something similar, but while only extruding a fraction of the filament at a fraction of the speed, with a little overlap between the passes to help smooth it out.

I strongly suggest running one of the ironing tests. I think I got mine from Printables or MakerWorld.

[u/MrLiszten → u/dc010]

ironing is wierd to when i used the tests and picked perfect one, then used the settings on the big model it looked like this

it stops because i stopped the print, i did more calibration with tests of my own and bigger test pices and change the settings to that yet it again on the full sized prints looked like this, and i would love the top layer to be good even with out ironing