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What is causing this ?

Discussion in 'Troubleshooting' started by supercazzola, Dec 25, 2017.

  1. supercazzola

    supercazzola Active Member

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    [​IMG]

    The second column from the left is hosed up. But all of the others are okay. I slowed the print down, but have no explanation for why? Is it the slicer doing this ? I’m using Cura.

    Thanks





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    #1 supercazzola, Dec 25, 2017
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Can't speak for Cura (not a user) but for most slicers you need to set a minimum layer print time in order to allow things to cool down when the layers get small like that. Otherwise you are putting melted plastic on top of still melted plastic... it ends up looking pretty much like that. Also make sure the parts fans are on full speed once it gets above the first couple of layers.

    If the minimum layer time is say 60 seconds and the layer finishes in 30, it will pause and let things cool down before moving on (or it will dynamically slow down while printing, or both)
     
    #2 mark tomlinson, Dec 25, 2017
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  3. supercazzola

    supercazzola Active Member

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    I guess that is why I made 20 of the items, and it doesn’t quite explain why some columns were PERFECT and that second one suck mooseballs !


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    #3 supercazzola, Dec 25, 2017
  4. Kilrah

    Kilrah Well-Known Member

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    Did you look at what order they were printing with?
    The slicer often tries to save time by minimizing travel moves, and is not clever enough to know it should equalize cooling times of multiple objects... so it's very possible it's both finishing a layer and starting the next on those, meaning they get 2 layers put on them right after the other with no wait time, but the others get time to cool while that happens and come out nice.
     
    #4 Kilrah, Dec 26, 2017
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  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Yep, the one thing that is absolutely custom to the slicer used is the toolpaths that the extruder takes.
    Sort of why they are all different :)
     
    #5 mark tomlinson, Dec 26, 2017
  6. Michael hineman

    Michael hineman Member

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    I am by far a pro. But looks like the issue is due to retraction.

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    #6 Michael hineman, Dec 27, 2017
  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Perhaps somewhat, but since it is only happening at the pints where the layers are smaller it is more likely simply the fact that the extruder is putting melted plastic on melted plastic and that doesn't work :) Stringing is usually a combination of retraction and heat management, but this mostly just looks like the latter. Ignoring the stringing the layers are wildly deformed.
     
    #7 mark tomlinson, Dec 27, 2017
  8. supercazzola

    supercazzola Active Member

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    The entire object (from the first layer on) for each of the four pieces in the second column, was messed up. But since this was just a 5 x 4 matrix of the same STL file, why did it impact that column only ?



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    #8 supercazzola, Dec 27, 2017
  9. Michael hineman

    Michael hineman Member

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    Is your z axis ballscrew bent? Mine was and it only would effect the print every full rotate of the screw.

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    #9 Michael hineman, Dec 27, 2017
  10. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Try a different slicer. The toolpaths are all determined by that software. See if another one does the same thing.
     
    #10 mark tomlinson, Dec 27, 2017
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  11. Kilrah

    Kilrah Well-Known Member

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    I explained it in my previous post. Slicer likely prints your things in a given order like A-B-C-D-E-F-F-E-D-C-B-A-A-B...
    Which means F and A have no time to cool and come out horrid, B/E a tad more so are a bit better, C/D have lots of time to cool and look great.
    Need to see if your slicer has an option to fo A-B-C-D-E-F-A-B... to equalize times, or use other common techniques like minimum layer time/slow down to improve things.
     
    #11 Kilrah, Dec 28, 2017
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  12. supercazzola

    supercazzola Active Member

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    Now I understand. Thank you - I’m slow, so sometimes I have to read the same thing in different ways to comprehend.

    The sad thing is that yesterday, the R2 stopped printing - it is a v2, with the wired heated bed, and now it won’t heat the bed. Checked both end of cables, so I am going to get in touch with Robo - but first, taking out the multimeter and measuring the resistance across the pads where the wires now are (and where the pogos used to be in the old design).

    The quality control on these units is sad.


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    #12 supercazzola, Dec 28, 2017
  13. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    Did you check both fuses on the mainboard?
     
    #13 WheresWaldo, Dec 28, 2017
  14. supercazzola

    supercazzola Active Member

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    Ohh, no. Let me look now...


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    #14 supercazzola, Dec 28, 2017
  15. supercazzola

    supercazzola Active Member

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    I’ll start a new thread


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    #15 supercazzola, Dec 28, 2017
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