Jump to content
Ultimaker Community of 3D Printing Experts

calibrating x, y


Recommended Posts

Posted · calibrating x, y

Steppers don't need calibration. They always do 200 steps per rotation. The rest is all fixed mechanical. Resulting in the right number of steps per mm of movement.

But... are you printing with PLA or ABS? ABS shrinks, so that would explain the 2mm difference. PLA also shrinks a bit, but only a tiny bit compared to ABS.

Other causes for smaller objects could be wrong slicing configuration settings.

  • Link to post
    Share on other sites

    Posted · calibrating x, y

    Well, now that your printer is working, it's recommended to upgrade to Marlin to start with, gives much better prints.

    The Beta3 from SkeinPyPy:


    assists you in upgrading to Marlin, and also contains an easier configurable Skeinforge.

    Not sure what could be wrong with your Skeinforge settings, but I made this display frame, sliced with SkeinPyPy. And it was spot on size wise. The hole for the display was exactly as the measured size of the display itself. It wouldn't have fit if it had become 2mm smaller.

  • Link to post
    Share on other sites

    Posted · calibrating x, y

    You might be using an old firmware from prior to October 2011.

    The correct 1/16 steps per mm is 78.7402

    if you get the current Marlin installed, the value is set correctly:

    #define DEFAULT_AXIS_STEPS_PER_UNIT {78.7402,78.7402,200*8/3,865.888}

    alternatively, you can add the following line in the beginning of your gcode:

    M92 X78.7402 Y78.7402

    That should make 100mm 100mm... at least on my UM... if that is not solving the issue, you might want to look into loose belt issues, if there is too much or any slack, the precision goes down.

  • 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
        • 11 replies
    • Create New...