Jump to content
Ultimaker Community of 3D Printing Experts

Strange filament cloging issue


Guest
 Share

Recommended Posts

Posted (edited) · Strange filament cloging issue

Hey guys this is an odd one, I have proudly been an owner of my Ultimaker 2 for over a year now and have never come across a problem like this one. Mainly the issue is that after a little while of printing, say maybe 15-30 min, the nozzle will clog and stop extruding plastic. Now unlike other clogs the nozzle is completely clear of any debris, instead it is due to the filament bunching up in the hot end. see here for a photo https://www.dropbox.com/s/z7mgw6dnli5ktxo/Photo%20May%2015%2C%209%2001%2003%20PM.jpg?dl=0

Current print settings are:

filament diameter(I measured it) 2.85mm

Temp:200-210c

bed: 55c

speed: 50mm/s

retraction: 4mm at 35mm/s

If anyone has any clue why this is happening during my prints and may have a solution any help would be greatly appreciated.  Also feel free to ask any questions as well.

Edited by Guest
  • Link to post
    Share on other sites

    Posted · Strange filament cloging issue

    It's probably the ptfe coupler and may need to be replaced. But also check and make sure the 3rd fan at the back is on 100% of the time. If this stops it can cause these issues.

  • Link to post
    Share on other sites

    Posted · Strange filament cloging issue

    Yes, there is a small bulge before the narrowing (the latter of which probably comes from pulling out). This bulge might be an indication that there is a small gap between Bowden tube and Teflon coupler. Checking the Bowden coupler as suggested by @labern is certainly the best thing you can do. Do also check the Bowden tube itself. If it has deep scars around the spot the Bowden coupler you might want to consider replacing the Bowden tube (you could actually also cut off a few mm to make the Bowden coupler holding the the Bowden tube at a clean spot, but you would have to cut very accurate to have a proper fitting between Bowden tube and Teflon coupler again).

  • Link to post
    Share on other sites

    Posted · Strange filament cloging issue

    Agree Teflon faulty!<

    As it gets hot after 10-20 minutes, it collapses onto the filament.

    You can save the day by loosening the 4 long vertical screws in the print head assembly, it releases the pressure. They only need to be as tightly wound as by "female fingers". (....)

  • Link to post
    Share on other sites

    Posted · Strange filament cloging issue
    Yes, there is a small bulge before the narrowing (the latter of which probably comes from pulling out). This bulge might be an indication that there is a small gap between Bowden tube and Teflon coupler. Checking the Bowden coupler as suggested by @labern is certainly the best thing you can do. Do also check the Bowden tube itself. If it has deep scars around the spot the Bowden coupler you might want to consider replacing the Bowden tube (you could actually also cut off a few mm to make the Bowden coupler holding the the Bowden tube at a clean spot, but you would have to cut very accurate to have a proper fitting between Bowden tube and Teflon coupler again).

    I have checked the connection and all appears to be fine, the only thing is i have already replaced the Teflon coupler recently as in only about 2 months ago and it still is 100% circular. The bowden tube is also snugly resting agents the coupler with no air gaps.

  • Link to post
    Share on other sites

    Posted · Strange filament cloging issue

    Could be clogged NOZZLE hole (0.4mm hole) itself, or intermittent temps sensor.

    When it stops, is the nozzle realy hot? Touch the nozzle from the ouside with filament. Must melt a big dent immediately

  • Link to post
    Share on other sites

    Posted · Strange filament cloging issue
    Could be clogged NOZZLE hole (0.4mm hole) itself, or intermittent temps sensor.

    When it stops, is the nozzle realy hot? Touch the nozzle from the ouside with filament. Must melt a big dent immediately

    Yes the nozzle is still very hot at at least it feels very warm, secondly I don't believe it is a clogged nozzle hole because I just did a test extrusion and measured the width of the extruded plastic and it comes out to exactly 0.4mm give or take 0.02mm. Unfortunatly i dont have a IR temp sensor so I cant check the true temps of the hot ends.

  • Link to post
    Share on other sites

    Posted · Strange filament cloging issue

    feels hot/ still warm is not good enough. 165C feels warm too.DOes it MELT filament on tht outside when you touch it with it?

  • Link to post
    Share on other sites

    Posted · Strange filament cloging issue
    feels hot/ still warm is not good enough.  165C feels warm too.DOes it MELT filament on tht outside when you touch it with it?

    Yes it still easily does melt filament then touching the nozzle.

  • Link to post
    Share on other sites

    Posted · Strange filament cloging issue

    something wrong:

    YOu checked it extrudes hard.

    You made atomic and it comes out clean

    It is hot and melts plastic.

    Only thing left is that the 0.4mm hole itself is clogged, or that the teflon coupler collapses when hot, or both.

  • 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
     Share

    • Our picks

      • New here? Get ahead with a free onboarding course
        Hi,
         
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 11 replies
    ×
    ×
    • Create New...