Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  

Filament jams in Bowden tube

Recommended Posts

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 ?



Share this post

Link to post
Share on other sites

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.


Share this post

Link to post
Share on other sites

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.


Share this post

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
Sign in to follow this  

  • Our picks

    • Ultimaker Cura | a new interface
      We're not only trying to always make Ultimaker Cura better with the usual new features and improvements we build, but we're also trying to make it more pleasant to operate. The interface was the focus for the upcoming release, from which we would already like to present you the first glance. 
        • Like
      • 130 replies
    • "Back To The Future" using Generative Design & Investment Casting
      Designing for light-weight parts is becoming more important, and I’m a firm believer in the need to produce lighter weight, less over-engineered parts for the future. This is for sustainability reasons because we need to be using less raw materials and, in things like transportation, it impacts the energy usage of the product during it’s service life.
        • Like
      • 12 replies

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!