Jump to content

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

      • UltiMaker Cura 5.8 beta released
        Another Cura release has arrived and in this 5.8 beta release, the focus is on improving Z seams, as well as completing support for the full Method series of printers by introducing a profile for the UltiMaker Method.
          • Like
        • 1 reply
      • Introducing the UltiMaker Factor 4
        We are happy to announce the next evolution in the UltiMaker 3D printer lineup: the UltiMaker Factor 4 industrial-grade 3D printer, designed to take manufacturing to new levels of efficiency and reliability. Factor 4 is an end-to-end 3D printing solution for light industrial applications
          • Thanks
          • Like
        • 3 replies
    • Create New...