Jump to content
UltiMaker Community of 3D Printing Experts

UM2 slow moves are not smooth


Recommended Posts

Posted · UM2 slow moves are not smooth

Hello all, 


I have recently purchased an used UM2, which has a weird issue with very slow XY moves.

It appears that the movement is not continuous, but stops at certain intervals.

This is also causing a kinda zebra effect on surfaces.


I wrote a test g-code file for demonstrating the problem. It's got only one move, G0 F50 Y100.


A video with very audible movement sound is here.


Any suggestions would be very welcome.




  • Link to post
    Share on other sites

    Posted · UM2 slow moves are not smooth

    F50 is 50mm per *minute*.  Not second.  So that's very slow.  That's slower than 1mm per second.


    Yes that vibration/noise is EXACTLY the same issue as with zebra stripes. There are two great solutions.


    One is to short circuit a jumper on the UM2 board.  There is discussion of this on this forum.


    The other solution is to buy a TL-Smoother.


    Read torgeir's posts and any posts mentioning tl-smoother or triangle labs.


  • Link to post
    Share on other sites

    Posted · UM2 slow moves are not smooth

    Thanks gr5!


    Indeed it is the same issue. I connected a scope on the stepper and it really explains it all.


    scope image

    scope image


    Clearly the stepper driver is loosing the current driving sync when changing between the drive modes, exactly as the data sheets explains.


    I will change the resistors and hopefully it's all sorted. 


    Big cheers!

  • 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
        • 14 replies
    • Create New...