Jump to content
UltiMaker Community of 3D Printing Experts

Z-axis accuracy

Recommended Posts

Posted · Z-axis accuracy

Hi all,


I have a print going, the second time around on these parts, and for some reason the material moves outward on the vertical face.  This should be a perfectly smooth surface.  It looks like the print running now has the offset at the same spot it was the last time I ran these.  Any idea why this might be happening?  Thanks in advance!




  • Link to post
    Share on other sites

    Posted (edited) · Z-axis accuracy

    So I am currently dealing with this issue however it is not nearly as severe. After hours of research, Ive yet to conclusively come up with a solution but I am still working on it. Ill break my theories into two categories, mechanical issues and settings issues.  After looking at your pictures, Im leaning more towards it being a loose belts. If anyone has anymore to add or would like to correct me if I said anything wrong then please do!



    • Temperature fluctuations
      • Fluctuations in temperature can cause the filament to come out at varying stages of fluidity.
      • You can see if this is what is happening by looking at the print core temps while printing.
    • Printing too fast
      • If you do have loose belts and are printing fast then there is an increase in likelyhood that these mechanical issues will start to affect your quality. Slow it down and see if that makes a difference.
      • Try to reprint it with the infill speed, outer wall speed, and inner wall speed all set to the same value. Maybe 30mm/s.
    • Flow rate may need to be tuned.
      • Print a square with 1 wall, no infill, and no top/bot layers. Measure the wall with a caliper and you should get the value you have set for your line width. If you aren't getting that value then find a flow calculator online and it will tell you the value you need.


    • Z axis screw not clean/lubricated properly.
    • Inconsistent filament diameter
      • Any fluctuations in diameter of the filament can cause inconsistent extrusions
    • Belts too loose.
    • Linear rods not lubricated.
      • Should be done monthly after the first year.
    • Bad bearing on one of the axis
      • This one is unlikely but still possible.
    • Bad PCB on print core which causes temperature fluctuations
      • Also pretty unlikely but possible
    Edited by Jhawk6553
    • Like 1
    Link to post
    Share on other sites

    • 2 weeks later...

    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 5.3 stable released
        In this stable release, Cura 5.3 achieves yet another huge leap forward in 3D printing thanks to material interlocking! As well as introducing an expanded recommended print settings menu and lots of print quality improvements. Not to mention, a whole bunch of new printer profiles for non-UltiMaker printers!
          • Thanks
          • Like
        • 28 replies
      • Here it is. The new UltiMaker S7
        The UltiMaker S7 is built on the success of the UltiMaker S5 and its design decisions were heavily based on feedback from customers.
        So what’s new?
        The obvious change is the S7’s height. It now includes an integrated Air Manager. This filters the exhaust air of every print and also improves build temperature stability. To further enclose the build chamber the S7 only has one magnetically latched door.
        The build stack has also been completely redesigned. A PEI-coated flexible steel build plate makes a big difference to productivity. Not only do you not need tools to pop a printed part off. But we also don’t recommend using or adhesion structures for UltiMaker materials (except PC, because...it’s PC). Along with that, 4 pins and 25 magnets make it easy to replace the flex plate perfectly – even with one hand.
        The re-engineered print head has an inductive sensor which reduces noise when probing the build plate. This effectively makes it much harder to not achieve a perfect first layer, improving overall print success. We also reversed the front fan direction (fewer plastic hairs, less maintenance), made the print core door magnets stronger, and add a sensor that helps avoid flooding.

        The UltiMaker S7 also includes quality of life improvements:
        Reliable bed tilt compensation (no more thumbscrews) 2.4 and 5 GHz Wi-Fi A 1080p camera (mounted higher for a better view) Compatibility with 280+ Marketplace materials Compatibility with S5 project files (no reslicing needed) And a whole lot more  
        Curious to see the S7 in action?
        We’re hosting a free tech demo on February 7.
        It will be live and you can ask any questions to our CTO, Miguel Calvo.
        Register here for the Webinar
          • Like
        • 18 replies
      • UltiMaker Cura Alpha 🎄 Tree Support Spotlight 🎄
        Are you a fan of tree support, but dislike the removal process and the amount of filament it uses? Then we would like to invite you to try this special release of UltiMaker Cura. Brought to you by our special community contributor @thomasrahm
        We generated a special version of Cura 5.2 called 5.3.0 Alpha + Xmas. The only changes we introduced compared to UltiMaker Cura 5.2.1 are those which are needed for the new supports. So keep in mind, this is not a sneak peek for Cura 5.3 (there are some really cool new features coming up) but a spotlight release highlighting this new version of tree supports.  
          • Like
        • 22 replies
    • Create New...