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Unanswered Weird overhangs and indentations

Discussion in 'Troubleshooting' started by Tim Pilcher, Jun 21, 2016.

  1. Tim Pilcher

    Tim Pilcher New Member

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    Hi Guys,
    I'm getting these strange overhangs and indentations on the items i'm printing.
    You can see from the pictures i've included that its like the extruder is going to far on some places.
    Its also leaving a bend (within a straight) sections.

    I'm using PLA at 210 degrees and the bed at 50 degrees.
    I'm also using Cura as the slicer.

    I'm generally really pleased with what i'm printing but the smaller the print the bigger the imperfections I seem to get.

    I have tried to reduce the speed but it doesn't really make much difference.

    Do you guys have any ideas that I can try?.

    Many thanks
    TIM
     

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    #1 Tim Pilcher, Jun 21, 2016
  2. TomerO

    TomerO Member

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    Maybe play with the extrusion multiplier?
    Just a total guess

    Sent from my Nexus 5 using Tapatalk
     
    #2 TomerO, Jun 21, 2016
  3. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Check the motors (X and Y) for a loose drive sprocket.
    That is too small of an imperfection for a loose belt, but if the setscrew on the drive gear is loose you will get smaller imperfections...at least until it gets loose enough to really spin free.
     
    #3 mark tomlinson, Jun 21, 2016
  4. Ryan TeGantvoort

    Ryan TeGantvoort Active Member

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    Possibly try lower Acceleration Settings. And your XY Jerk Value should be roughly 20-30% your print speed. I could see these two settings play a big factor the smaller the print.
     
    #4 Ryan TeGantvoort, Jun 21, 2016
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  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Yes, acceleration can be a big factor.
    I cranked mine way down with no appreciable loss in overall print speed, but smaller layers/models will take longer since they involve more changes in directions.
     
    #5 mark tomlinson, Jun 21, 2016
  6. Ryan TeGantvoort

    Ryan TeGantvoort Active Member

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    I believe I dropped mine to 600mm/sec for both Acceleration and Max Acceleration.
     
    #6 Ryan TeGantvoort, Jun 21, 2016
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  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    I think mine are 500-ish.I initially set them to 900 and later lowered it again.
    The original numbers were silly high.
     
    #7 mark tomlinson, Jun 21, 2016
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