Jump to content

Filament jammed in print core


aubustou

Recommended Posts

Posted · Filament jammed in print core

Hello,

 

I bought an Ultimaker 3 one month ago and I have a constant problem of jamming/gindring in Printcore AA with PLA. All 2 hour long prints are half done because of this.

Actually, the filament is stuck because of an increase in diameter from 2.85mm to 3mm around the Printcore. Friction in boden tube, retraction prevented, grinding in the feeder, filament jammed.

 

That makes me quite astonished because I haven't changed anything in the Cura profile, nor on the printer. I never had a problem like this on Ultimaker 2+...

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core

    The increase in diameter happens to me also but it's not a problem for me.  I can still print just fine.  Is your "third fan" working?  The one in the door of the UM3 print head?

     

    You should have gotten a second AA core.  Have you tried that to see if there is something wrong with your core?

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core
    Quote

    The increase in diameter happens to me also but it's not a problem for me.  I can still print just fine.  Is your "third fan" working?  The one in the door of the UM3 print head?

     

    Yes, it is working.

    I suspect the diameter because when I remove the boden tube, the filament gets stuck precisely when I try to push in the thicker part.

     

    I'll try with the provided second AA core. Thanks for the tip. Launching a print and getting back to you.

  • Link to post
    Share on other sites

    • 2 weeks later...
    Posted · Filament jammed in print core

    There's tons of causes of grinding of filament back at the feeder but this one - filament grows to 3mm - is not something I've heard of much before.  Are you sure that's the issue?  how do you know?  when it happens is the filament stuck in the core?  Can it slide up and out?

     

    This growth in filament size may be unrelated is what I'm trying to say.  There are about 15 causes of failed extrusion on my list but not this cause as I've only seen it be a problem when the print is over.  Maybe we should look into other issues?  maybe I should give you the complete list?

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core

    When I remove the bowden tube, the filament is stuck precisely where it's the fattest. You can't move it except with pliers.

     

    Let's have a look at the complete list :)

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core

    Hi,

    sorry, because of my humble English ...
    This thickening happens in every Hotend. Without this, a retract would be largely ineffective ... (In principle, like a syringe: there is a hole at the bottom, but at the top it is sealed by a moving piston - here filament -)
    Otherwise, once liquefied, it would immediately run out of the nozzle unrestrained.
    But the important thing is that it happens in the right place! Here's it, right at
    Metallhotends, a big risk if too often in quick succession too much material
    is pulled back. Thus, the temperature moves with the excess material across the temperature barrier into the cool zone - which is fatal. There, this thickened material can no longer be transported into the hot zone, because too cool and filament is too thick. It is then stuck and can only be pulled out.
    Something is also conceivable, if the fan for the Hotendkühlung not enough cooling air at the Hotend can pass (Dirty, Eingehaust and too high temperature, or generally too high ambient temperature - PLA is very soft even at very low temperatures). It can not be a malfunctioning Hotenendlüfter, since the problem does not occur after 2 hours or so, but within minutes (after 3-4 minutes, the temperature is already more than critical ...).
    I would guess. I hope you understand somewhat what I mean ..

    Greetings, Digibike

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core

    Yes, I understood quite a bit. The filament is thick over a large distance along it, around 5cm starting from the hot end. I never had this problem for over a year on an Ultimaker 2+.

     

    Well my Ultimaker 3 is brand new. I bought it in past May. Therefore, I don't think it's a lack of maintenance because I used it less than 5 hours.

     

    I definitely think there is a problem with cooling in the hotend, but the fans are working correctly...

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core
    12 hours ago, aubustou said:

    Yes, I understood quite a bit. The filament is thick over a large distance along it, around 5cm starting from the hot end. I never had this problem for over a year on an Ultimaker 2+.

     

    Well my Ultimaker 3 is brand new. I bought it in past May. Therefore, I don't think it's a lack of maintenance because I used it less than 5 hours.

     

    I definitely think there is a problem with cooling in the hotend, but the fans are working correctly...

    Did you also check the third fan, the little one at the back of the nozzle? Your description of phenomena is exactly what happens when this fan fails: heat traveling way too far up into the filament, and softening this before the nozzle, so it can't get into the nozzle anymore. Maybe some piece of plastic got stuck into the fan? Or a loose electrical wire?

     

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core
    On 6/7/2018 at 1:58 PM, geert_2 said:

    Did you also check the third fan, the little one at the back of the nozzle? Your description of phenomena is exactly what happens when this fan fails: heat traveling way too far up into the filament, and softening this before the nozzle, so it can't get into the nozzle anymore. Maybe some piece of plastic got stuck into the fan? Or a loose electrical wire?

     

     

    The little one at the back of the nozzle? Err, what fan at the back of the nozzle? There is one in the Ultimaker 2 but not on the 3...

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core
    5 hours ago, aubustou said:

     

    The little one at the back of the nozzle? Err, what fan at the back of the nozzle? There is one in the Ultimaker 2 but not on the 3...

     

    The equivalent fan on your UM3 is the front fan. It should keep the upper part of the print core from getting too hot. If filament hairs get tangled in it, it could stop running.

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core

    What brand filament? Or did I miss that? I saw PLA, but not a brand.....

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core
    6 hours ago, fbrc8-erin said:

     

    The equivalent fan on your UM3 is the front fan. It should keep the upper part of the print core from getting too hot. If filament hairs get tangled in it, it could stop running.

    Ah okay. I don't have an UM3, so I didn't know that fan has changed location. In my UM2 I once found that it had sucked up filament hairs: it looked like a coloured PLA spider web, although not enough to stop the fan yet. The bearings of these little fans also tend to wear out fast, much faster than bearings of big fans. First they get noisy and slow down, they wobble visibly, and then they totally stop due to too much friction in the damaged bearings. This was a very common problem in early Pentium computers (1995...2000). This could also happen if dust from clothes accumulated in the fan bearings, or inbetween the blades. So it is something I still look out for, if overheating might be one of the causes of a problem (but of course, there could also be other causes).

     

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core

    Ok, I understood what happened. I forgot to mention one major point: I bought a Box3D enclosure along the UM3.

    I wasn't sure about the electric fan so I haven't plugged it. The sound reduction was great for me and I didn't see the problem with temperature.

    Turning on the electric fan on the enclosure solved the problem.

  • Link to post
    Share on other sites

    Posted · Filament jammed in print core

    Also the left white cover around one of the motors was a little out of its position, pushing the buildplate a little bit, enough for the print to be bad.

  • 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

      • 🎄✨ Thingiverse Tree Ornament Challenge! ✨🎄
        We've been running a Tree Ornament Challenge with a chance to win an UltiMaker S3 or colorFabb filament.
        Design a 3D printable tree ornament and join our festive challenge on Thingiverse. 🎁✨


        📆 Submission Deadline: December 22
        🏷️Tag your designs with Holidays2023

        Click here to join and check out the over 300 other amazing designs

        How to Enter
        Design an Ornament
        Create a 3D printable tree ornament that captures the magic of the winter season. Think snowflakes, sleighs, reindeer, cozy mittens, or anything that embodies the joy of the holidays. Upload to Thingiverse
        Share your masterpiece on Thingiverse and add the tag Holidays2023. Don't forget to include a captivating description and images that showcase your design from different angles. Submit by December 22
        All entries must be submitted by December 22nd to be eligible for consideration.
          Entering a new design
         
        Entering an existing design
         
         
        Winning designs should:
        Be original Creations
        Your designs should be original works, avoiding the use of others' intellectual property without permission. Include STL Files
        Each submission must include at least one STL file for 3D printing. Showcase a Completed Print
        Provide at least one photograph featuring a completed print of your design. Include Documentation
        Share the creative journey! Include documentation of your design process, giving us a peek behind the scenes. For example, show a screenshot of the model in your design program. Use the Tag Holidays2023.
        Use this tag to ensure your entry is counted in the Tree Ornament Challenge. Be submitted after October 1st, 2023
        Ensure your design was uploaded to Thingiverse after October 1st, 2023. Adhere to Submission Guidelines and Terms of Service
        Make sure your submission aligns with our guidelines and Thingiverse's Terms of Service.  
        Good luck 🎉
        • 1 reply
      • S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
        (Sorry, was out of office when this released)

        This update is for...
        All UltiMaker S series  
        New features
         
        Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
          • Like
        • 0 replies
      • Ultimaker Cura 5.6 stable released
        Cura now supports Method series printers!
         
        A year after the merger of Ultimaker and MakerBotQQ, we have unlocked the ability for users of our Method series printers to slice files using UltiMaker Cura. As of this release, users can find profiles for our Method and Method XL printers, as well as material profiles for ABS-R, ABS-CF, and RapidRinse. Meaning it’s now possible to use either Cura or the existing cloud-slicing software CloudPrint when printing with these printers or materials
        • 13 replies
    ×
    ×
    • Create New...