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Extrusion issue with 1.75mm filament

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Posted · Extrusion issue with 1.75mm filament

I had modified my Ultimaker 2+ printer to be able to print with 1.75mm filament. I used the kit from Dynamism (https://www.dynamism.com/mosaic-palette-ultimakerconversionkit.html)  to replace the extruder arm, Bowden tube and add a short hot-end PTFE sleeve in the print head. After couple of tweaks I was able to move the 1.75mm filament freely through the feeder to reach the nozzle.


The problem that I have now is that after reaching the nozzle the filament does not flow through the nozzle as can be seen in the video included. During the run, the filament does get slightly grounded at the feed point which I think should not be a big problem. The issue is that though the tip of the filament is inside the very hot nozzle (220 C) it still retained its original structure without melting. The nozzle is a new one hence there is no blockage in it. I wanted to see if anyone has a suggestion as to how to resolve this issue?






Grinded part of filament.jpg

Start part of the filament.jpg

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    Posted · Extrusion issue with 1.75mm filament

    It seems that there is an insert in the kit.



    I can imagine that the filament gets stuck in front of it or in it.


    Have you tried feeding the filament manually?



    1. Maintenance - > Head up nozzle an push the filament manual


    or (next)


    2. Maintenance -> move material


    Many greetings

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    Posted · Extrusion issue with 1.75mm filament

    Thank you for the response.

    I did try to heat up the nozzle move the filament using the 'Move material' option under Maintenance. The machine did clicking noise as the dial was rotated but it did not move the material through the nozzle.


    Next I went ahead replaced the 2.85mm coupler with the insert with a new 1.75mm coupler that was free of the insert so the filament can flow freely. Even that did not help with the issue. 



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    Posted · Extrusion issue with 1.75mm filament



    The conversion is apparently not something that works at the push of a button. I would not rule out minor tinkering.


    5 hours ago, UlrichC-DE said:

    1. Maintenance - > Head up nozzle an push the filament manual

    That worked?

    If you can get it through the tube manually, without a motor, it may also work with a motor.

    This way you can also find out if it is stuck somewhere.


    The clicking sound is normal. If you are not sure whether material is flowing, you can reach under the feeder and feel the material flow with your finger.

    I would also test if you can stop the filament in the bowden with your thumb.

    Maybe the feeder does not have enough power.


    Maybe something helps to find the problem.

    Many greetings

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