Jump to content
Ultimaker Community of 3D Printing Experts

Nozzle repeatedly clogging while printing Ninjaflex TPU


Recommended Posts

Posted · Nozzle repeatedly clogging while printing Ninjaflex TPU

Hello,

 

I'm having a problem printing white NinjaFlex TPU on an Airwolf3D AXIOM Dual Direct Drive printer. I am trying to run some test prints of a face mask ear strap but am having problems with the nozzle clogging shortly after the print starts (within the first 5 or so minutes). What happens is the print will start printing the first layer without a problem, but after printing the brim and the outline of the part, the nozzle starts clogging as it prints the infill for the first layer. I used the recommended profile settings on the NinjaTek product page as a guide for the settings and am using Apex (Airwolf3D’s rebranded version of Cura) for the slicer with the standard TPU profile modified with the NinjaTek settings for speeds.

 

So far, I have tried a deep clean of the nozzle (which was using ABS previously), and tightening the hobbled bolt in the direct drive hoping that would help. I also tried changing the Z offset from the table in case the nozzle was too close or far away from the bed. I have attached an image showing the part I tried to print, and a copy of the profile I used for the test print (you can still view the settings without having Apex). Can anyone give me some advice on what I can do to solve this issue?
 
Thank you!
Jason O

20201216_103211.jpg

Apex TPU Profile.zip

  • Link to post
    Share on other sites
    Posted · Nozzle repeatedly clogging while printing Ninjaflex TPU

    The filament is probably not clogging but rather it goes all serpentine in the gap between the feeder and the hot end.

     

    Just try printing slower.  Does this printer have a long bowden between the feeder and the nozzle?  If so add a drop of mineral oil every meter of filament printed.  It will not affect the print quality.  No one seems to ever believe me but it works well to reduce bowden friction.

     

    So if you are getting 10% extrusion try printing at 1/10th speed.  At least go for half current speed.

     

    Regarding pressure - you want low pressure.  Grip is not the issue.  "pushing a string" is the issue.  It's very hard to push a string - it just wants to curl up.  In fact I recommend the lowest possible feeder tension as if you squeeze the filament you will get a slower feed rate.  Not a disaster but it causes slight underextrusion.

  • 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

      • Startups, apply for the Forward AM Innovation Award!
        Are you a startup using 3D printing? Perhaps you should continue reading... 
         
        Together with BASF we are launching the Forward AM Innovation Award - the very first global contest for startups developing new applications with 3D printing!
         
        Why apply?
        The winning startup will receive €100,000 in goods and services*, along with coaching and marketing exposure from top-notch leaders in the industry.
         

         
        Who can apply?
        Your startup creates products using Additive Manufacturing, is less than 5 years old, and has less than 50 employees. We are looking for 3D printing applications with a strong focus on innovation, sustainability and scalability.
         
        Dental aligners, shoes, tools, automotive parts, music instruments, industrial tooling and molding, medical implants, sports equipment, toys, architecture, fashion, construction... all are welcome to join!
         
        Do you have an innovative, sustainable and scalable idea that leverages the unique possibilities of 3D printing? Then it is time to apply!
        More information can be found here.
         
        Applications close on March 28th, 2021
        * What does "in goods and services" mean?
        The winner will be able to pick any item from the overall product and service portfolio of the sponsors, e.g. printers, materials, consulting, software... Choose whatever you need to accelerate your startup.
         
          • Like
        • 0 replies
      • New here? Register your Ultimaker for free 3D printer 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
        • 0 replies
    ×
    ×
    • Create New...