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Solved Filament gets brittle during print and breaks below hobb

Discussion in 'Troubleshooting' started by Johnh, Aug 14, 2019.

  1. Johnh

    Johnh New Member

    Sep 5, 2016
    Likes Received:
    Hi first time posting
    I have an Robo 3D r1 +. I have printed with it for about 3 years or a little more. The problem I am having is with PLA. I did 1 print of a pocket watch holder and it came out nice.
    I decided to print 2 more at the same time. I added an Oiler and a drop of vegetable oil to cotton. The print started and printed the flat base of the part. Then it kept moving but not extruding as the filament was broke. Just a the base of the bobbed wheel. Had to take it apart to get it cleaned out.
    When I started to set up to print again I found the filament turned brittle and broke very easily. I followed the brittleness until I got to more pliable material. Cut a few inches back and loaded the material. Had good flow correct size and restarted the print. No changes but kept the Oiler.
    Has anyone else experienced a problem like this. Tonight I will clean it again and try the print but without the Oiler to see if that was the cause or qt least appears to be.
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Feb 21, 2013
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    Yes, your PLA has gotten ... "wet"
    That is it has absorbed moisture from the air.
    When PLA gets wet , it gets brittle.

    You can dry out a roll by storing it in a container with desiccant (not the small packets -- something like DampRid) for a while.
    I would suggest keeping it stored that way when not in use.

    Some folks will suggest the bake-it-dry method, but that is probably not the best approach :)

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