What might be the problem if the chimney of a Benchy isn’t “flat” or irregular like on the picture?
The black one is in Polymaker Polylite, the white one Extrudr GreenTEC white. I also tried PETG and it’s the same there. I thought that the nozzle temperature is maybe to high and causes too much flow, so I reduced it to 220° (240° before) but it didn’t help much.
It looks like a pretty well defined step, are you sure it doesn’t look like that in the slicer?
Hey keep ya shirt on, it was just an observation. I’ve only ever printed one benchy before and I believe there’s a few versions out there. In the slicer if you toggle between the speeds and flows can you see any changes in either in relation to where the step is?
That’s my thought as the step is right at the level that the printer clears printing the top of the roof.
I apologize, I didn’t meant to be rude.
This is speed:
and this is flow:
That’s what is irritating me, there seems to be no change where the step happens.
In the meantime I thought, maybe my nozzle is a bit clogged and changed to the spare one, but that didn’t help. Next I tried increasing the “Min printing speed” in the filament settings. I’m on 70mm/s now and it’s almost completely gone. But I’m afraid that this could have other downsides.
No worries mate, all good. When you look at the layers, is there any infill in the chimney at all, or is it all wall? Because the slicer doesn’t show the step at all, it makes me think the inner wall is pushing the outer wall out but then why not the lower half of the chimney? The answer may be that because it’s finished the top of the roof the inner wall filament is still fluid when the next layer starts and it’s pushing it down and out.
So, sorry for the long delay. I coulnd’t find the time to answer.
What I could figure out is that, activating the arachne engine eliminates or at least mitigates the issue:
I’m having the same issue while using the classic slicer. I haven’t tested the arachne engine yet, as the classic engine is the default again (contrary to the documentation on “Which wall generator you should use? Classic or Arachne | Bambu Lab Wiki” says).
I’m using the Bambu filament that was delivered with the printer (P1S), in combination with the default slicer settings for the “0.20mm Standard @BBL X1C” profile.
I have some results using respectively standard speed, ludicrous speed on the official model from 3dbenchy com, as well as a result from the presliced model. The presliced model doesn’t have these artifacts. As far as I can tell, the inside of the chimney seems to be fine in all three cases (no distortion, only some stringing in the ludicrous case.)
(It seems I’m not (yet?) allowed to upload pictures/add links in my posts.)
Did you find out what was going wrong in the end?
I have the exact same issue.
Nothing in the sliced files shows this step at all.
Cheers
Yes, I’ve switched the “Wall generator” from “Classic” to “Arachne”
Yup that’s the Bambu benchy. Use another slicer and you won’t get that.
I cannot confirm that! I just tried Orca Slicer, latest stable release, and with the classic wall generator I get the exact same effect. Only switching to Arachne helps.
Could be evidence of “gap infill” transition with classic wall, arachne changes it to innerwall. See pics. First pair are Classic. Second are Arachne.
I’ve noticed this with a model of mine with a thinnish cylinder wall that had a random change and chased it down to this.
Interesting find, I might try switching to that function on a few of my prints to see if they turn out a bit better on small steps.
