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Unresolved ABS bunching up in the heatbreak

Discussion in 'Troubleshooting' started by gunsmoke132, Apr 23, 2019.

  1. gunsmoke132

    gunsmoke132 Member

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    i recently have come across a problem with abs filament. im printing at 230c and it has been working for a while now but for some reason, it keeps melting inside the extruder and causes the extruder to jam
     
    #1 gunsmoke132, Apr 23, 2019
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Heat creep. Usually the fan on the hotend not running full speed (or not running at all)
     
    #2 mark tomlinson, Apr 24, 2019
  3. gunsmoke132

    gunsmoke132 Member

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    it seemed to be working fine
     
    #3 gunsmoke132, Apr 24, 2019
  4. gunsmoke132

    gunsmoke132 Member

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    i took it off and saw a lot of dust so i cleaned it all out with a q-tip and im still having the problem...
     
    #4 gunsmoke132, Apr 24, 2019
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Probably worth investing a few bucks into a replacement, that is almost always the culprit with heat creep.
     
    #5 mark tomlinson, Apr 24, 2019
  6. gunsmoke132

    gunsmoke132 Member

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    i replaced the fan and it worked for about 30 min of printing...
     
    #6 gunsmoke132, Apr 25, 2019
  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    #7 mark tomlinson, Apr 25, 2019
  8. gunsmoke132

    gunsmoke132 Member

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    could it be because the thermistor is not pressed up against the heater block and isn't accurately reading the temp? like it thinks its 235 when in reality its like 295? because the hot end i got relies on the silicone sleeve to hold the thermistor in place
     
    #8 gunsmoke132, Apr 29, 2019
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Sure, that is a possible explanation.
    (I never did like that version of the hexagon -- it is a silly way to do things.)

    If you remove the rubber boot/sleeve and use a few turns of kapton tape around the thermistor and the heatblock (so it can't move) you can then but the boot back on and life will be good.
     
    #9 mark tomlinson, Apr 30, 2019
  10. gunsmoke132

    gunsmoke132 Member

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    ill try that and if not I got 2 more tricks up my sleeve. #1 is to cut horizontally into the fins to create some more surface area.
    #2 is to attach another fan on the opposite side of the stock fan and to have it blow the opposite way so there's more air flowing.
     
    #10 gunsmoke132, May 1, 2019
  11. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    The kapton tape will hold it. The original Robo used that on a j-head (MK style) that was only using kapton tape. It is pretty aggressive at holding stuff.
     
    #11 mark tomlinson, May 1, 2019

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