Jump to content
Ultimaker Community of 3D Printing Experts

U2+ Nozzles very hard to change


Recommended Posts

Posted · U2+ Nozzles very hard to change

Hi All, we just got this thing a few weeks ago and now the nozzles are unchangeable almost.

Extremely hard to thread on and off.

I don't see the threads inside the machine with plastic on them, looks clean.  I tried some acetone on a q-tip.  Looked clean.  Nozzles are clean - I atomic clean them when I swap.

I don't see any damage to the nozzles or the internal threads, meaning I don't think there was any cross threading here.

If there is damage its extremely minute.

Just curious if anyone has experienced this and if the part of the print head that accepts the nozzle is changeable ie: the heating part or if I need a new print head if the threads are toast.

It seemed pretty difficult to change the nozzles (hard to turn) from the beginning.  The little wrench they send is a total joke.


  • Link to post
    Share on other sites

    Posted · U2+ Nozzles very hard to change

    I guess a tiny bit of thread on the Olsson block is buggered.

    Not sure how that happened 4 threads in but we will have to replace it.

    Maybe I can tap it out.

    M6 pitch?




  • Link to post
    Share on other sites

    Posted (edited) · U2+ Nozzles very hard to change

    Hi RancherBob,


    Welcome in here, most people observe that some of the filament over time "leak" into the threads and somehow lock the nozzle likes thread lock is used -that's impossible to open in the normal way..

    So, what we do is to preheat the nozzle (from maintenance menu - select advanced - then nozzle heating) up to the printing temperature of the last used filament. Now, it's very easy to replace the nozzle.. 

    Also, I'm using copper pasta in between the threads - nozzle to heat body (only threads her - no spill inside body!!!), this improve the thermal conductivity between the nozzle and the heat block very much,-and also works a thread "seal" and anti size compound!





    Edited by Torgeir
  • Link to post
    Share on other sites

    Posted (edited) · U2+ Nozzles very hard to change

    HI Torgeir and thanks for the welcome.

    I'll make sure to change the head at 150c? That was what I was told.

    I have been changing hot over 200c.

    I'll try and look into this 'Copper pasta' sounds great!🤩

    Edited by RancherBob
  • 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

      • New here? Get ahead with a free onboarding course
        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
        • 13 replies
    • Create New...