persistent top layer smush
i’m pretty happy with my print quality, but I can’t seem to get rid of top layer smush in close quarters.
first two pics are from https://ellis3dp.com/Print-Tuning-Guide/articles/extrusion_multiplier.html
following pics are my prints. is this an EM problem? a top layer extrusion width issue?
VC3.1-500mm, my slicer settings are a copy/paste of a stock bambu “0.16mm optimal” profile
5 Replies
I like to over extrude the whole print for extra strength, and then I have a top infill extrusion multiplier to get good top surfaces.
Try that.
Oh, in prusa slicer, it's
top infill width. If I recall correctly you make it bigger than the default to get smoother top layers
I have similar issues and it seems to be associated with Orca slicer. I tried with Prusa slicer and the top surfaces turn out just fine. I found this other post, where it's claimed to be an Orca/Bambu bug --> https://discord.com/channels/582187371529764864/1047083750200180797/threads/1264615424977534987
Orca has this setting "Thick internal bridges". When it is checked, you can see in the sliced model, that the internal bridge below the top layer is doubled (!) in height. Switching this off seems to get rid of the problem in Bambu slicer (according to that post, I haven't tried myself) but it does not seem to change things in Orca - albeit the sliced preview changes the layer height.
I reverted to Prusa slicer ...
I've gotten better results with some fine tuning but yeah I'm starting to hone in on Internal Thick Bridges as well....
If you are happy with extrusion elsewhere, you can reduce top surface flow ratio in orca slicer. Slightly reducing Infill/wall overlap can also help with the over extrusion where the walls and infill meet.
Often the extrusion amount is slightly too high everywhere, but it's only visible in the top layer.
I had this problem for ages in prusa slicer and solved by having a different top layer extrusion width.
I am intentionally setting a slightly too high extrusion amount because it increases part strength.
Settings which affect this:
Filament diameter
Extrusion multiplier
Extrusion width
I think that's all?