Filament "bleeding" help

Hello all! This is my first post! I’m not brand new to printing, but still fairly new to the P1S. I recently swaped out to a 0.2mm nozzle for some smaller prints and I am encountering a problem I can’t solve. I’m printing a small (1.5 cm) emblem, but the top layers are grey instead of the cream white they should be. I would also love to make the top layer image crisper.

Things I’ve tried:

  • drying the black filament in a heated drying box
  • confirming flush into infill is turned off
  • increased flush volume from automatic settings

Both filaments are Bambu matte PLA. Photos attached, cm ruler for scale. Any other suggestions for how I might fix this?


2 things

  1. your white filament at least is under extruding, so increase flow rate/calibrate, and it will put more white stuff down to help

  2. check your slicer preview. Is it automatically painting black filament underneath your white areas, or is it pretty clear vertical boundaries on the slicer and just muddy IRL when printed?

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  1. Got it, I’ll increase flow rates.
  2. It is printing black only under the design:

Another print just finished where I increased purge volume further and it seems to have improved the muddiness of the top three layers:


(one on the right is the newst one)

I’m running a flow rate callibration, which I’ve never done, and I’ll try again from there!

What @Bullocks stated is precisely what’s going on. Don’t rely on automatic calibration, perform a manual calibration.

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It also is interesting in that the internal solid infill looks concentric (or like 100 walls) and the top is monotonic. I wonder aloud if rectilinear internal solid infill might look better here. Concentric sometimes has a stacking effect that presents itself when you try to stuff it into small shapes. I don’t think its the root cause (flow imo) but maybe a step to explore

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Thanks @Olias and @Bullocks for the suggestions. I am running a manual calibration now. First part is done and it’s definitely underextruding.

Here are the default settings:

You can see it in the deeper layers. It’s just so small. Maybe I can alter the top shell thickness?