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

Blocked nozzle, Teflon damaged?

Recommended Posts

Hi Guys,

So I have been having horrible underextrusion problems, and my stepper motor has been skipping. Tried cleaning my nozzle, different settings, different temperatures, atomic methods. Basically have tried most things.

Finally today I was like ok, I need to take the nozzle apart and see whats going on. Well I did and my suspicion might be correct, but I was wondering if you could answer.

Does this Teflon piece look damaged to you or is this normal when its been printing for a while.

Also I had an episode happen when I was doing the atomic method and it started smoking and puffing out. Then a bunch of black carbonized stuff came out.

Also as a side note when I push the filament through the teflon piece, it catches on the black ring and causes friction.

Any help would be awesome!

Here are some of my atomic pulls and the teflon piece I just took apart







Share this post

Link to post
Share on other sites

Also here is what the actual extrude head looks like. It was suprising to see so much gunk on the bottom. But as for the inside of the actual tip, I can see straight through IE a tiny hole of light, but there is a lot of dark around the edges. Is that normal, or should I clean it?







Share this post

Link to post
Share on other sites

You need to clean it.

Could you provide a clear picture of the inside of the teflon coupler? At the top there be a small identantion (inwards) where the filament expands. That's what causes the barbed hook like structure on the filament when you pull it out.


Share this post

Link to post
Share on other sites

Acetone is only useful if you printed with ABS but it wouldn't hurt. Try to submerge it in acetone so it gets to the inside of the nozzle.

About the teflon piece - no idea how to clean it. Normally I'd buy another on the Ultimaker store. An (untested) idea would be to cut off the bad part from the teflon piece. Be careful to not cut that much so that the piece will be too short. I absolutely has to make contact with the nozzle. That's why there is a spring there because the teflon piece must form one path for the filament leading straight to the nozzle.


Share this post

Link to post
Share on other sites

It looks like my Ultimaker is back up and running, Although I ended up cutting off that black ring that was on my teflon piece. The other thing I did was to get a very small drill and poke it through the nozzle tip. I always could see light at the other end, but after the drill, the light was much clearer with a bigger hole.


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

    • 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.
      • 2 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!