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Printing issues ...
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QuoteJamesK
Grand stuff Paul, but the effect Rob is seeing seems to be much greater than normal - I wonder why. Robse, what travel speed do you use? If it's unusually slow, perhaps you are losing more to ooze than normal?
I use 130mm/s travel speed
At this point I think that what fits most is what Paul says: "- no retraction - the beginning of the next segment after the move will be starved due
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robse
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Printing
QuoteJamesK
That's interesting. Why did the hollow cubes not pause between layers? Perhaps you used the spiral vase setting? If you just used 1 perimeter and no-infill you should have a test where the nozzle still comes to a stop after each layer and rises to the next Z.
Sorry for not going back through previous posts - did we check that the extruder grub screw(s) are tight and the gear not slip
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robse
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Printing
Paul: wonderful software (is it released ?) and brilliant analysis.
JamesK: I did the hollow cube print and it's perfectly fine (image below). The reason is that in that case the nozzle prints continuously without pauses
Here you can see the images: hollow cube test
I did some other tests, the problem did improve putting the same width and speed for infill and perimeters (they should have the sa
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robse
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Printing
QuotePaul Wanamaker
I took a portion of that image, cropped and enhanced it:
Black is not a colour to print with
QuotePaul Wanamaker
So here are my thoughts:
You could try rotating the part by 45 degrees and reprint. This will help determine if it is related to bed movement or extrusion. If it is due to bed movement, then with the results should be different. If it is due to extrusion then
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robse
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Printing
QuoteJamesK
QuoteThe less current the motor has, the more the problem arise. I did set the current to the maximum the hardware allowed before malfunctioning (clicks and so on)
Could you expand on that a bit? 'clicks' is normally a symptom of not enough current to the motors, not too much. The primary symptom of too much current is overheating, either of the stepper motor or the stepper driver. A
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robse
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Printing
Hi,
black is difficult to see, but anyway:
- The problem arise only when the extruder motor stops - pause - starts.
- When it starts, it looks like it doesn't start as fast as it should, leaving 1-2mm of empty perimeter
- It improves putting "extra restart" when retract is enabled (but I want to fix that without retraction)
- The less current the motor has, the more the problem arise. I did set
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robse
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Printing
Hi There,
a quick update (sorry for the delay).
Printing PLA I had success in repairing the issue showed here imgur, setting "extra length on restart" on slic3r at 0.2mm
Now I'm trying PETG, great material so far, but this problem is much more visible.
Having some time to do tests, while I did see and improvement with the extra lenght on restart at 0.4mm, I tried disabling retraction altoghet
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robse
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Printing
I try to do it tomorrow
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robse
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Printing
QuoteJamesK
Quoteslic3r just over extrude by default for me (and many others)
Yes, but it doesn't do it evenly. If you try and fight the slic3r bug with an extrusion multiplier you'll drive yourself nuts. If you're not confident in what slic3r is doing, then I'd recommend using different software.
Not so sure about this but IIRC I had a similar problem trying out simplify3d
What about the hot-
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robse
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Printing
ignacio_3D, RRuser:
0.8 extrusion multiplier and 20mm/s perimeter speed
Would it be underextrusion I would have issues in other parts of the print too
Steps/mm are well calibrated, slic3r just over extrude by default for me (and many others)
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robse
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Printing
Downunder35m:
it doesn't retract. It's a direct drive extruder with the pulley really visible
I may do another test anyway
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robse
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Printing
Not as I know of.
Here are the slic3r extruder settings.
Note: I tried with lenght: 0 (ie disabled) with the same result.
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robse
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Printing
Hi,
I have a prusa i3.
Lately i'm having the issue you can see on the photos below.
I'm using slic3r
Settings are: Pla 190°, extruder 0.5mm, layer height 0.3, fan on, retraction disabled both on slic3r and marlin fw
These are printed at 190°:
These are printed at 215° :
The motor is not issuing a retraction (I checked looking at it while printing). The point where the negative scar occurs
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robse
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Printing