Jump to content

Recommended Posts

Posted · Nozzle off, hard to push filament

After a print that failed mid-print, I noticed that the extruder was pushing filament until the pressure built up and it slipped backwards in the bowden. Then I undid the tightening bolt on the extruder and attempted to push filament by hand. It was difficult and the stream of extruded PLA did not appear to be commensurate with the applied pressure. After some reading on the forums, ramping temp up to 250 and pushing, and other incantations I decided to unscrew the nozzle to see if it was clogged with some dirt or similar. Upon removing the nozzle while hot, I found that simply pushing filament through the hot end without the nozzle was difficult. If I managed to push it through, and kept pushing the filament moved through fairly well, but any dwell caused the filament to "jam" or "stick" in the hot end. Any ideas? Is this normal?

FYI this is a v2 hotend with ghagen (http://www.thingiverse.com/thing:15897

) style extruder.

-J

 

  • Link to post
    Share on other sites

    Posted · Nozzle off, hard to push filament

    With the nozzle attached, it's deceptively hard to push the filament by hand, except when first pushing a fresh piece of filament into an already hot pool of filament in the nozzle. Once that has squirted out, it can be really hard to keep making forward progress my hand. But with the nozzle off, there's really nothing to impede the filament and I'd expect it to move very easily, to the point of coming out the end un-melted if pushed fast enough (not that I've ever tried it).

    So, it seems like there's some sort of blockage in your hot end. My best guess would be some damage or stray solidified plastic, either at the junction of the teflon piece and the PEEK, or the Bowden and the teflon piece.

     

  • Link to post
    Share on other sites

    Posted · Nozzle off, hard to push filament

    If I push the filament through the hotend quickly, it moves easily. If I let the filament sit in the hotend for a few seconds, with the nozzle off, then it becomes stuck. This is what is happening when printing I believe. The extruder is pushing hard, but the filament is not transferring that pressure to the pool and very little extrusion is resulting due to the filament sticking in the hot end. Prints are thus impossible to complete.

    I did not have this problem with the v1 hotend. I did have the problem of the v1 extruder grinding the filament and failing to feed however. Upgrading both has led to the current situation. I'm fairly familiar with the hand pressure on the filament required to generate a given amount of extrusion, at least with the v1 hotend, and the current pressure required is too much. Such that you can easily kink the filament if you are not careful.

     

  • 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

      • Help Us Improve Cura – Join the Ultimaker Research Program
        🚀 Help Shape the Future of Cura and Digital Factory – Join Our Power User Research Program!
        We’re looking for active users of Cura and Digital Factory — across professional and educational use cases — to help us improve the next generation of our tools.
        Our Power User Research Program kicks off with a quick 15-minute interview to learn about your setup and workflows. If selected, you’ll be invited into a small group of users who get early access to features and help us shape the future of 3D printing software.

        🧪 What to Expect:
        A short 15-minute kickoff interview to help us get to know you If selected, bi-monthly research sessions (15–30 minutes) where we’ll test features, review workflows, or gather feedback Occasional invites to try out early prototypes or vote on upcoming improvements
        🎁 What You’ll Get:
         
        Selected participants receive a free 1-year Studio or Classroom license Early access to new features and tools A direct voice in what we build next
        👉 Interested? Please fill out this quick form
        Your feedback helps us make Cura Cloud more powerful, more intuitive, and more aligned with how you actually print and manage your workflow.
        Thanks for being part of the community,

        — The Ultimaker Software Team
        • 0 replies
      • Cura 5.10 stable released!
        The full stable release of Cura 5.10 has arrived, and it brings support for the new Ultimaker S8, as well as new materials and profiles for previously supported UltiMaker printers. Additionally, you can now control your models in Cura using a 3D SpaceMouse and more!
          • Like
        • 18 replies
    ×
    ×
    • Create New...