Jump to content
UltiMaker Community of 3D Printing Experts

Filament jams in Bowden tube


Recommended Posts

Posted · Filament jams in Bowden tube

Hey everyone.

I bought some PLA reels from MatterHackers, and one of them (Light Blue)

is between 2.95 and 3.00mm width (the others are 2.85).

This filament will jam in the bowden tube to such extent,

that I have to disconnect it from both sides and pull out the filament with


Do I need a new tube ?

Is 2.95mm within acceptable range for PLA filament ?



  • Link to post
    Share on other sites

    Posted · Filament jams in Bowden tube

    Once the size gets over about 3.05mm, you could certainly start having problems. When you measure your filament, you should always be sure and measure twice in each spot, at right angles, since the filament is often not really round.

    If your filament is really in the 2.95-3.00 range, then It ought to be fine in the standard Bowden tube - but evidently yours isn't.

    You could try replacing it with a new tube and/or one that has a larger internal diameter. I started using nylon tubing with a 0.15" ID (3.81mm). I find that it works fine for retractions still, and it gives me a bit more leeway for working with filaments like Taulman nylon that runs on the large size.


  • Link to post
    Share on other sites

    Posted · Filament jams in Bowden tube

    This is what I bought:



  • Link to post
    Share on other sites

    Posted · Filament jams in Bowden tube

    I have the same light blue filament from MatterHackers. I found, through trial and error, that I was clamping the filament too tightly. It was deforming and the deformation made it harder to push through the Bowden tube. I also noticed that the delrin wheel that pushes the filament against the hobbed bolt was off-center. Once I loosened the screw pushing the filament and re-centered the delrin wheel, I was able to print with the filament. Mine was about 2.95 mm in diameter.


  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now

    • Our picks

      • New here? Get ahead with a free onboarding course
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 14 replies
    • Create New...