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Artifacts in print

Posted by TCW 
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TCW
Artifacts in print
February 27, 2014 05:13PM
I keep getting strings in between separate pieces in a print, but there are still a few defects on the outside too sometimes. Any idea on the cause of this?

MakerFarm Prusa i3
Latest Slic3r
PLA
.1 layer height
.35 nozzle
185C
Retraction length 1.2mm, 60mm/s
Print speed 120mm/s

Pictures of examples






Although I was happy if finished my longest print yet...


Edited 2 time(s). Last edit at 02/27/2014 07:48PM by TCW.
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KingRahl
Re: Artifacts in print
February 27, 2014 06:11PM
Ooze bane. Retraction needs to be set under extruder printer settings.
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TCW
Re: Artifacts in print
February 27, 2014 07:49PM
Quote
KingRahl
Ooze bane. Retraction needs to be set under extruder printer settings.

Yeah thats what I was thinking. Just got to figure out whats wrong with 1.2mm @ 60mm/s
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SheldonE
Re: Artifacts in print
February 27, 2014 11:58PM
general consesus indicates retraction values should start around 3mm.
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Ralf
Re: Artifacts in print
February 28, 2014 04:35AM
1.2mm sounds reasonable unless you have a bowden setup, but are you sure your extruder is capable of retracting at 60mm/s? If you retract too fast, it might not retract at all.
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TCW
Re: Artifacts in print
February 28, 2014 10:34AM
Quote
Ralf
1.2mm sounds reasonable unless you have a bowden setup, but are you sure your extruder is capable of retracting at 60mm/s? If you retract too fast, it might not retract at all.

I lowered it to 1 mm @ 20mm/s and will see how that works.

The acceleration values in the firmware are at 500. Which are set by Colin for the kits so I don't think it would be changed.

#define DEFAULT_ACCELERATION 500 // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 500 // X, Y, Z and E max acceleration in mm/s^2 for r retracts

I am going to test it out tonight and see how it goes.
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TCW
Re: Artifacts in print
February 28, 2014 07:34PM
No dice...
(don't mind the holes in the picture, just the random stringy bits)

Edit: The minimum travel for retraction is shown as 1mm in the picture below, but was set to 2mm for the print shown.
Edit2: This is direct drive, not bowden.

Untitled by xxtcwxx2000, on Flickr

Untitled by xxtcwxx2000, on Flickr

Screen Shot 2014-02-28 at 7.38.09 PM by xxtcwxx2000, on Flickr

Edited 7 time(s). Last edit at 02/28/2014 07:52PM by TCW.
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KingRahl
Re: Artifacts in print
February 28, 2014 08:43PM
I'm not sure if you're setting the wrong spot. Minimum travel is not what needs to be set. Your first number on the top "Length:" is what sets your retraction. If your still getting ooze bane, then raise the number. Try going to 2mm or 3mm.
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TCW
Re: Artifacts in print
March 02, 2014 07:45PM
I set the extraction length to 3mm and the Minimum travel after retraction to 1mm, but some excess plastic bits are still on the edges... I am starting to think maybe my printing speed is too fast.


Screen Shot 2014-03-02 at 7.34.21 PM by xxtcwxx2000, on Flickr
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Ralf
Re: Artifacts in print
March 03, 2014 05:04AM
Hmm.. I totally overlooked that.. Yes the print speed could definitely be contributing to the problem.

As for accleration, raising it for the extruder might also help.
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