Jump to content
Ultimaker Community of 3D Printing Experts

printer fails midprint due to filament "knots"

Recommended Posts

Hey guys.

Lately my prints are failing due to this annoying error and I cant figure out what causes it. Since it didnt happen before Cura 2.6.1 the only guess I can make its anything software sided. I know, it sounds weird that an error like that has something to do with a slicer, but I´m thinking of any retraction settings that changed or something like that. Something that makes the spool lose its tension for a second and cause this "knot"

This error not only occurs on this cheap ass PLA, it also happens on my expensive ones like colorfabb, which u probably know is perfectly coiled up on spool.

From the last 4 prints (between 11h and 32h printtime), 3 failed cause of this error.


Has anyone of you guys an idea on how to solve this problem?


Share this post

Link to post
Share on other sites

This is not a software thing. This usually happens if you aren't careful when removing and storing a spool you've already used. It's very easy to have the end of the filament go underneath a coil on the spool and then you have this issue. You might not notice it as first since the filament can keep unspooling normally for a while but eventually it gets too tight and gets stuck. Only way to fix it is to uncoil the filament a bit and find the point where it crosses over and clear it.

  • Like 1

Share this post

Link to post
Share on other sites

I´m usually very careful when removing a spool. I´m always making sure that the coil stays tight and use clips so it can´t unwind while stored.

Also, the white spool u r seeing on the foto made a 20hours print before, wasn´t removed and remained untouched until I started a new 11hour print today, which failed after about 5 hours. It´s even funnier that this cheap ass white PLA runs more smooth than the colorfabb one. On my 32hours print with colorfabb I had to jump up every 30minutes cause I was hearing it getting stuck. Sometimes the motors had enough force to unstuck it on their own, but at some point it failed.

here´s a photo of the colorfabb spool. at least optically everything seems fine to me



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

  • Our picks

    • How to 3D print with reinforced engineering materials
      Ultimaker is hosting a webinar where we explain how you can achieve and maintain a high print success rate using these new reinforced engineering materials. Learn from Ultimaker's Product Manager of Materials and top chemical engineer Bart van As how you can take your 3D printing to that next level.
      • 0 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!