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Gunk or burning filament?

Discussion in 'General Questions' started by aznhlfan, Jul 11, 2017.

  1. aznhlfan

    aznhlfan Active Member

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    I usually use Hatchbox PLA, but the pic is an object that I printed using Colorfabb PLA. I have the hotend at 190° -200°, the bed at 40°, this just recently started. I did just take apart my hot end, and soaked the nozzle for 2 hours in acetone. Is this just gunk coming from my hot end, or am I burning the filament?[​IMG][​IMG]

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  2. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    Likely excess filament that sticks to the nozzle until it is knocked off into the print then smashed into the print. You can probably fine tune the extruder by calibration.
     
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  3. aznhlfan

    aznhlfan Active Member

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    I have calibrated it multiple times, the average is 850

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  4. aznhlfan

    aznhlfan Active Member

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    I have a stepper motor on order i am going to change, i also have a new nozzle on order i am going to change. Since it has been close to a year for this machine, and the stepper makes a high pitch squealing sound now and again.

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  5. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    Maybe extruder 5° C cooler
     
  6. aznhlfan

    aznhlfan Active Member

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    195° For the hotend?

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  7. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    Try it and see, also in your slicing profile maybe shrink the extrusion multiplier a little bit

    S3D = Hotend >> Extrusion Multiplier
    Slic3r = Filament Settings >> Extrusion Multiplier
    Cura = Material >> Flow​

    When I say modify this value I mean just by a fraction S3D and Slic3r use a scale of 0 - 1+ so decrease by .0n, Cura uses a percentage so decrease by single percentage points.
     
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  8. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    There is no magic number for extrusion temperature... trust us on this.
    I have one printer that happily extrudes PLA best at 180c and another than won't work unless it is above 190c (and it is best around 195c) our delta runs hot and needs over 200c and the C2 is also near 195c for best with most PLA.

    Every printer is different :)

    (Every spool can be slightly different... )
     
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  9. aznhlfan

    aznhlfan Active Member

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    My cura flow (extrusion multiplier) is 110%, i will try backing that off as well

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  10. Geof

    Geof Volunteer Moderator
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    If your extruder is calibrated correctly for what your running flow should be at 100% (Or 1.0 depending on your slicer). If you set it at 110% your overextruding 10% on a calibrated extruder (+ or - a few percent)
     

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