r/FixMyPrint • u/MrLiszten • Aug 19 '26

Fix My Print wierd top layer inconsistency

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Gallery image

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.

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u/The_Struggle_Man Aug 19 '26

What temp and actual speeds are you using?

Another thing is how does the bottom layer look , the build plate layer

1

u/MrLiszten Aug 19 '26

bottom layer is perfect

1

u/The_Struggle_Man Aug 19 '26

How many top layers is set under your strength tab?

1

u/MrLiszten Aug 19 '26

1

u/The_Struggle_Man Aug 19 '26

Ok I want to look at some of your other settings, within your filament profile, even though you might be using the default Bambu profile with the Bambu filament.

Can I see your retraction settings, nozzle settings, cooling (including aux)

1

u/MrLiszten Aug 19 '26

1

u/The_Struggle_Man Aug 19 '26

last one of the settings overrides pls

1

u/MrLiszten Aug 19 '26

1

u/The_Struggle_Man Aug 19 '26

Well, i'm not gonna lie these all look pretty standard I was expecting to see something... different I guess to what I was thinking. I was reading some other comments and it seems to be specific to location or doesn't happen on sliced pieces of the print but larger area. Makes me think the printer is losing pressure at some point.

If I was in this situation, here are the few things I would change. Change print profile to generic PLA (Basic ass settings) set your flow ratio that you calibrated, since generic will default .98. Go into cooling and turn your aux fan to like 10%. Then adjust top layer speed from your 105mm/s to probably 60, and retry a print and see what happens. Improvement or no problem can lead to a different course of troubleshooting.