strange over/under extrusion
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@nick9one1 said in strange over/under extrusion:
I'm not really sure if this is a slicer, firmware or hardware issue, but
... old gcode files that previously printed fine are coming out bad.
That eliminates slicer and firmware as a suspect.
- Does the temperature graph look stable during printing?
- Does your extruder make any funny noises?
- Does your Vin look stable on the DWC page during printing?
- What printer, firmware version, hardware do you have?
- Same filament?
- Did the humidity or room temp change since yesterday?
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@nick9one1 If files that previously printed OK but now do not, that rules out the slicer. If you haven't made any changes to the firmware, that rules out the firmware. If you haven't made any changes to the configuration, that rules settings. Which only leaves hardware. If the extruder looks and sounds unusual, that would point to either the extruder itself or possibly a fault with the hot end.
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thanks. I'm leaning towards it being the extruder too.
What's strange is it seems to make large retractions at ends of lines, when I have retraction set to zero. This is supposed to be a base layer of a solid cube.
Everything points to a hardware fault, but I cant think how a hardware fault would cause retractions to be too large like that.
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@nick9one1 Post some GCODE.
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@nick9one1 Yeah, I don't see any retractions in the GCODE at all.
What's with "Firmware retraction"?
I've heard it mentioned, but I don't know what revision it came into being or how to control it. -
@alankilian That's commented out. I use superslicer which usually has new features like that quite early.
I thought it would be a good idea to print a cylinder in vase mode to see if its the retractions that are causing issues...
looks perfect to me;
and the same cylinder set to 2 walls and vase turned off.
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@nick9one1 The only thing that I can think of which will cause what looks like retractions to happen when retractions are set to zero, is pressure advance. You do have a very high value of 0.7. That would also make the extruders look and sound unusual. And pressure advance may not get applied in vase mode because essentially it's one continuous move with no obvious start and end point where PA could be applied (but I'm not sure how the algorithm deals with that so I might be wrong).
Suggest you try disabling pressure advance by setting it to 0 (M572) or at least to a much lower value. The only thing that puzzles me is that you say you haven't made any changes.
EdIt. According to your first post, you say that you turned PA off. Yet it's there in the config.g file you posted.
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@deckingman
Thanks. You're right. I had turned it off (I'm sure I did!) But will double check and reprint. -
it's always something simple.
Pressure advance should be 0.07 not 0.7!
Thank you !!
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@nick9one1 said in strange over/under extrusion:
Prints are coming out terrible and were fine yesterday.
@nick9one1 said in strange over/under extrusion:
Pressure advance should be 0.07 not 0.7!
So you changed pressure advance this morning and that was it?
