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ABS weird printing

Discussion in 'Troubleshooting' started by Darkhunter12, Oct 13, 2014.

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  1. Darkhunter12

    Darkhunter12 New Member

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    Hi guys,
    Whenever I print with ABS my first layer comes down weird, I am printing at a good temp 87 degrees (dosent warp) with kapton tape. While its printing its first layers its like there is air bubbles in between. Ill attach photos so you can see :)
    Thanks
     

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    #1 Darkhunter12, Oct 13, 2014
  2. sal

    sal New Member

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    Are your fans on? They should be off foe ABS. You also might be to far from tape for first layer. Do you have an offset? are you using auto level?
     
    #2 sal, Oct 14, 2014
  3. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    The bubbles might be due to moisture absorbed by the filament. That causes bubbling in the filament when it prints (the water vaporizes).
    You can 'dry' the filament by baking it (some discussion over here: http://www.printrbottalk.com/forum/viewtopic.php?f=74&t=1556)


    EDIT: I have some filament that has done this, but it never was bad enough to affect the printed output significantly. I dried it and it went away.
     
    #3 mark tomlinson, Oct 14, 2014
  4. Printed Solid

    Printed Solid Volunteer Admin
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    You're talking about the ripples, right? I don't think that's a fan or moisture issue. ABS with excess moisture prints with tiny little bubbles all over. Bake the filament and it goes away.

    I'm not 100% sure what causes those ripples, but know of two potential causes.
    One is that you have 'dirty' spots on your tape. By dirty I mean some fine contamination on the surface. Finger prints are a good example. Give the tape a thorough scrubbing with alcohol or acetone if it's handy. This seems to come through even if you're coating the bed with hairspray or ABS slurry.

    The other possible cause is that your nozzle is just a hair too low. You build up a little back pressure in the nozzle due to attempting to extrude too much. As the pressure builds and relieves, you get those ripples.
     
    #4 Printed Solid, Oct 14, 2014
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