I have this model which fits the plate of a Bambu P1P:
However, I get this strange thick line in the print. I tried two different PLA filaments and used the “0.20 mm Strength” preset for “Generic PLA”.
Has anyone an idea why this is caused and how it could be prevented?
Lol I was waaay off in my suggestion. Deleted the text as it was not useful at all… I need more coffee.
That is indeed odd but not completely unheard of. I am wracking my brain because I saw this artifact in another report somewhere and please forgive me for my faulty memory on what the remedy was.
However, in the absence of a suggestion at this point and as a potential trouble shooting method, have you tried cutting the model within the slicer to produce a test model with only the offending section? This would free up your plate space to move the model around to experiment.
If my faulty memory serves. The issue that I remember was that when the head travels across that bridge, it looks like the flow is overcompensating for that bridge. Combine that with the fact that this model is also forcing the head travel to come to the edge of the plate, leads me to believe that it might be a confluence of two elements the slicer simply can’t deal with. The two elements are the slowing down at the edge of the plate and the compensation of flow over the bridge.
If you can try an experiment to see what happens.
Cut the model but keep the model placement near wall near the edge of the plate just like you have it with the full size model. Do a print and verify that the phenomena is reproducible with just the smaller segment of the model. If it is, then you know you have at least isolated what part of the model head movement is causing issues. But with the smaller model you now have the freedom to move the model segment to other parts of the build plate.
Then second experiment only if the first one works, move the model segment away from the edge of the plate and see if it does it again. If it does, then that would lead me to look for a way to slow down the print head travel towards the edge of the plate. If it doesn’t reproduce, the artifact and you get a clean model in the center of the plate, then I would look towards possibly changing the speed of the outer wall.
I’ve not played around with these parameters but this is where I would look to slow down specific speeds.
Another quick test, albeit a big waste of filament, is to run the complete model in quiet mode which will put all speeds at 50% and see if it reproduces the problem. If the problem is fixed at the 50% speeds, you probably can look towards extrusion and my usual go to suspect is lowering the max volumetric flow in the filament profile which I hate to do because it feels like giving up. I’d much rather find the actually cause.
Also, have you tried changing the wall sequence to outer/inner?
And before I forget, did you check the head movement animation using the preview mode? It may tell you something about what the slicer is doing.
Another option is to paint a manual seem somewhere on the model that is away from the current seem. This will force head movement to change possibly for the worse but again, it would tell you that flow is likely a culprit.
And last but not least, try a different infill pattern to see if it affects the placement of that wall.
