Jump to content

Recommended Posts

Posted (edited) · Big blob at end of print, UM2+

Since a recent upgrade, I now always see each print end with a huge (3x3mm) blob driven into the object with the head remaining in the final position. Apart from the slight mess on the final print, this causes the filament-driving teeth to grind the plastic, so that the NEXT print fails to feed any material until I remove the PLA filament, cut off the ground piece, and re-insert it.

 

I've printed over 100 hours with this printer, it worked fine until the latest upgrade to fw 2.6.2, and works splendidly in every other respect. I'm using a new install of Cura 3.2.1 on macOS with a UM2+.

 

Is this a (known) bug in the latest firmware? Should I downgrade? And if so, to which version?

 

-jcw

 

PS. As a quick check, I just printed an object sliced by an earlier version of Cura, and that completed fine. So the problem may actually be in Cura, not the firmware... therefore, attached: an object which prints WITH the extra blob. Hopefully that will help someone diagnose this issue.

Extrudy_Object_2015_03_04_12_00_43.gcode

Edited by jcw
  • Link to post
    Share on other sites

    • 2 weeks later...
    Posted (edited) · Big blob at end of print, UM2+

    Recently this problem was reported in the Cura 3.2 subject forum.

    The problem is caused by a change in Cura which exposes a bug in the UM2(+) firmware: At the end of the gcode file, Cura used to save a few lines with the used Cura settings. These settings were removed making the file a few lines shorter and this exposes the bug where the UM2(+) finishes the print while still a few moves are in the motion controller buffer.

     

    The bug will soon be fixed and consists of two changes:

    1) We will fix the bug in the UM2(+)  firmware.

    2) Cura will make the gcode files a bit longer again so the UM2(+) bug will not occur on older firmware versions.

     

    For now the workaround is to revert to Cura v3.1. Or add about 10 extra comment lines at the end of your gcode file, or add an M400 command at the end of your gcode. These commands can be set in the 'End Gcode' section of your Cura machine settings.

     

    Here a link with more info about the UM2 bug:

     

    Edited by Indy31
  • Link to post
    Share on other sites

    • 3 weeks later...
    Posted · Big blob at end of print, UM2+

    Hi!  I am also having this blob issue (I’m on a Mac, using Cura 3.2.1).  Could someone please tell me the exact code I would need to enter in the ‘End Gcode’ section of my Cura machine settings to fix things?  I would really appreciate the help - thanks!! :)

  • Link to post
    Share on other sites

    Posted (edited) · Big blob at end of print, UM2+

    Time has progressed....

    Easiest solution right now is to download the Cura v3.3 beta release which should have the longer type of gcode files again and so hiding the UM2 bug. Note that the bug in the UM2 firmware has also been fixed but I didn't spend time in confirming it was included with this Cura beta version (there is a new firmware released with this Cura beta but it isn't mentioned in the release notes. It will sure be fixed and released in the final Cura 3.3 release).

     

    Tip: You could even update your printer with the firmware from the Cura 3.3 beta and then revert to Cura v3.2 if you can't work with the beta.

    Edited by Indy31
    • Thanks 1
    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

      • Help Us Improve Cura – Join the Ultimaker Research Program
        🚀 Help Shape the Future of Cura and Digital Factory – Join Our Power User Research Program!
        We’re looking for active users of Cura and Digital Factory — across professional and educational use cases — to help us improve the next generation of our tools.
        Our Power User Research Program kicks off with a quick 15-minute interview to learn about your setup and workflows. If selected, you’ll be invited into a small group of users who get early access to features and help us shape the future of 3D printing software.

        🧪 What to Expect:
        A short 15-minute kickoff interview to help us get to know you If selected, bi-monthly research sessions (15–30 minutes) where we’ll test features, review workflows, or gather feedback Occasional invites to try out early prototypes or vote on upcoming improvements
        🎁 What You’ll Get:
         
        Selected participants receive a free 1-year Studio or Classroom license Early access to new features and tools A direct voice in what we build next
        👉 Interested? Please fill out this quick form
        Your feedback helps us make Cura Cloud more powerful, more intuitive, and more aligned with how you actually print and manage your workflow.
        Thanks for being part of the community,

        — The Ultimaker Software Team
        • 0 replies
      • Cura 5.10 stable released!
        The full stable release of Cura 5.10 has arrived, and it brings support for the new Ultimaker S8, as well as new materials and profiles for previously supported UltiMaker printers. Additionally, you can now control your models in Cura using a 3D SpaceMouse and more!
          • Like
        • 18 replies
    ×
    ×
    • Create New...