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Knots in filament

Discussion in 'Troubleshooting' started by Ian Tiller, Oct 30, 2014.

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  1. Ian Tiller

    Ian Tiller New Member

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    I have noticed when I do a 100 mm extrude there are random knots in the extruded filament. Is this because of debris in the nozzle or what?
     
    #1 Ian Tiller, Oct 30, 2014
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Could be caused by steam (from water vapor absorbed by filament). Could be caused by an imperfection in the nozzle. Or could be caused by crappy filament (or likely a lot of other reasons). It might be as simple as the temperature -- if nozzle temperature wrong for that filament. If I run way to hot then PLA gets all sort of twisty and strange as it extrudes. It will swing up and stick to the nozzle... Take and post a picture if you can.
     
    #2 mark tomlinson, Oct 31, 2014
  3. Ian Tiller

    Ian Tiller New Member

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    it is giving me an error when i try to upload but i lowered the temp and the knots are just about gone so I'm going to try a print and see
     
    #3 Ian Tiller, Oct 31, 2014
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Good idea :)
    For PLA you can jack up the extruder 100 mm or so and do some 10 mm test extrusion at various temperatures to find a sweet spot.
    You don't want the filament to curl immediately back around and stick to the extruder (too hot).
     
    #4 mark tomlinson, Oct 31, 2014
  5. Printed Solid

    Printed Solid Volunteer Admin
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    I wouldn't worry too much about what the filament looks like coming out of the nozzle into open air unless you're having problems with your prints.
     
    #5 Printed Solid, Oct 31, 2014
  6. Mike Kelly

    Mike Kelly Volunteer

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    Upload pictures to IMGUR.com
     
    #6 Mike Kelly, Oct 31, 2014
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