Jump to content

PTFE insulator coupler clogged, drop of PLA found on the print


Charles10

Recommended Posts

Posted · PTFE insulator coupler clogged, drop of PLA found on the print

Hi,

After 1 week of successful small prints, the nozzle started to get clogged. I cleaned it and everything seemed to be fine, except that on a large print (20 hours) it failed mid-print again.

The filament got stuck in a different way so I had to take everything apart to discover the ptfe insulator coupler were responsible:

20150921_081751.thumb.jpg.e461c8d3de5da9611731056e178a332d.jpg

The grey filament I am using became bounded with the ptfe coupler and you can see that the tip of the wire has the print of a ball.

This tiny ball or drop was found on the failed print.

The brown color on the ptfe coupler might come from the bronze pla filament I was using before.

Do you know what could have caused this issue?

I would think that it is temperature-related and that at some point, the ptfe coupler's temperature dropped to a level below the melting point of PLA.

The parameters I was using were:

Layer height: 0.1mm

Shell thickness: 0.8mm

Fill Density: 20%

Thanks!

20150921_081751.thumb.jpg.e461c8d3de5da9611731056e178a332d.jpg

  • Link to post
    Share on other sites

    Posted · PTFE insulator coupler clogged, drop of PLA found on the print

    The filament shouldn't stick to the Teflon, maybe it expanded, you could try to pull it out with some pliers (be carefull not to break the filament or you won't have any grip on it anymore...

    It probably happened during some retractions?

    What is the brand of the filament?

  • Link to post
    Share on other sites

    Posted · PTFE insulator coupler clogged, drop of PLA found on the print

    The only way to pull the filament out was to heat it up before.

    I use Ultimaker filament.

    I changed the ptfe coupler and raised the temperature from 210 to 225 celcius degree and started the exact same print again.

    The same issue happened at the end, the only difference was that I was here and heard the motor doing a strange noise, going back and forth. I manage to pause the printing and and block the filament.

    I still don't know what is triggering this issue. A retraction issue or an imperfect seam on the filament that catches an edge in the nozzle are my leads.

  • Link to post
    Share on other sites

    Posted · PTFE insulator coupler clogged, drop of PLA found on the print

    Hi Charles10,

    Could you post a picture of your print head from this angle:

    maxresdefault.jpg

    Filament should not be flooding into the coupler, nor should PLA bond to the PTFE. Have you done any Atomic pulls? I suggest doing a few Atomic pulls when you change filament to make sure your nozzle is clear.

    Guide here --> https://ultimaker.com/en/support/view/149-atomic-method

  • Link to post
    Share on other sites

    Posted · PTFE insulator coupler clogged, drop of PLA found on the print

    Hi,

    Thanks for your suggestions!

    I played a lot with different parameters and solve this problem:

    I raised the pressure of the feeder. The white tension pointer was at the top position, I lowered it down to the second line.

    20150924_124532.thumb.jpg.fbe777559909101c680a51d0378375bd.jpg

    (the lower the pointer, the greater the pressure on your filament)

    I also turned down the speed from 50 to 40 mm/s.

    Before, I raised the pressure, the filament would get stuck because the feeder force was not great enough to overcome any friction changes from the filament in the nozzle. It would then back up and try again, over and over until the filament is completely ground.

    After I made this adjustment, I was able to get a 40-hour print without any issues.

    20150924_124532.thumb.jpg.fbe777559909101c680a51d0378375bd.jpg

    • Like 1
    Link to post
    Share on other sites

    Posted · PTFE insulator coupler clogged, drop of PLA found on the print

    After I made this adjustment, I was able to get a 40-hour print without any issues.

     

    Wow, long print! Glad to hear you got the problem resolved. I've never seen filament flood the coupler like that just because it couldn't make it through with enough force. Duly noted, thanks for sharing the solution! :)

    • Like 1
    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

      • Introducing Universal Cura Projects in the UltiMaker Cura 5.7 beta
        Strap in for the first Cura release of 2024! This 5.7 beta release brings new material profiles as well as cloud printing for Method series printers, and introduces a powerful new way of sharing print settings using printer-agnostic project files! Also, if you want to download the cute dinosaur card holder featured below, it was specially designed for this release and can be found on Thingiverse! 
          • Like
        • 10 replies
      • 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
    ×
    ×
    • Create New...