Jump to content
UltiMaker Community of 3D Printing Experts

Cura hangs when slicing a long print


Recommended Posts

Posted · Cura hangs when slicing a long print

Trying to slice for some lengthy prints and can't get Cura to complete. Progress bar hangs around 70% and task manager shows that curaengine.exe and Cura have both stopped using any CPU. Have left it to sit for a few hours a couple of times now and it hasn't finished slicing.

STL file is relatively small in data size (5mb) but fills the build volume, so the sliced job is going to be around 50 or 60 hours I expect.. .

Using Cura 14.07, Windows 7 64bit. No plugins. Has anyone else had this problem before, and if so, what was necessary to get the slicing to complete?


  • Link to post
    Share on other sites

    Posted · Cura hangs when slicing a long print

    Try reducing the poly count. High-res mesh are longer and more complexe to slice. Also if you have options to combine everything they also add complexe checks. I had cases that the slicing would not even start and simply reduction poly count using meshlab was enought to let it process the objects.

  • Link to post
    Share on other sites

    Posted · Cura hangs when slicing a long print

    After spending more time trying to slice very long prints, it seems that my previous "fix" was incorrect.

    What seems to be happening is that after successfully slicing 50ish hours of printing a few times, cura stops being able to finish slicing that job again until cura is closed and restarted.


  • Link to post
    Share on other sites

    Posted · Cura hangs when slicing a long print

    Odd. Can you send me your 3D model and exact settings used to d.braam@ultimaker.com

    (I keep the model confidential and only use it to diagnose the bug)

    Note that I've never had a processing of a model take more then 10 minutes. But my laptop is pretty fast.


  • Link to post
    Share on other sites

    Posted · Cura hangs when slicing a long print

    I have the very same problem. When I rescale the object to 80%, Cura finishes the slicing and gives a print job of 47h, but I just want the 100% scale which is 98x125x119mm (WxHxD)

    I tried the solution below, but it didn't change anything, except that my STl-file became 16MB instead of the 180MB before.


    The engine log shows the following. the step that freezes isn't shown in the log.

    Reading mesh from socket with 1036626 vertexes

    Analyzing and optimizing model...

    Vertex counts: 1036626 -> 145579 14.0%

    vMin: 65.815000 52.803000 0.000000

    vMin: -49.185000 -59.697000 0.000000

    Matrix: 1.000000 0.000000 0.000000

    Matrix: 0.000000 0.000000 1.000000

    Slicing model...

    Sliced model in 19.859s

    Generating layer parts...

    Generated inset in 207.669s

    any suggestions?


  • Link to post
    Share on other sites

    Posted · Cura hangs when slicing a long print

    Digging up old topics to reply in isn't really the best way to get your problems solved. Especially if there are 2 other topics about the problem already.

    As I said in the other topics, if slicing stops, first check out the latest beta to see if that solves it:



  • Link to post
    Share on other sites

    Posted · Cura hangs when slicing a long print

    Thanks Daid,

    I just found that topic too. I'm sorry for replying to an "old" topic, but I couldn't find the other ones and thought it would be better to reply to an existing topic than to start a new one.

    That been said, your solution indeed solved my problem for a 92h print.

    Thanks again.


  • 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 5.3 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
        • 21 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...