Jump to content

Help with Cura settings

Recommended Posts

Posted · Help with Cura settings

Reprap printer - cartesian

PETG filament 1.75mm

Cura 3.6


So I'm trying to print some parts with that have an open section in the center - a bit like a coffee cup I suppose and I'm getting so much stringing in the center where there should be nothing that it's basically ruining my prints. I've tried playing around with retraction settings, temp settings and travel speed and nothing seems to change. So I observed a print and when the strings are created the nozzle travels across the center of the print to start a new layer but the extruder doesn't retract and filament oozes out until it gets to where the next layer starts.


So in my meddling I tried turning off combing and then the extruder retracts during travels and the strings are gone. This creates several other problems that degrade the print quality in other ways, the first layer has problems due to how it stops, retracts and restarts so much. When combing is on the first layer doesn't go through all those stop start retract moves and it works perfect. Having combing turned off also seems to create a lot more blobs both within the infill and on the outside of the print.


So is there a way to enable retraction while combing is on?


All those travels seem really inefficient when printing something with nothing in the center, that time could be better spent printing something. Is there a need for the nozzle to travel across the print like that between layers and is there a setting to stop it?



  • Link to post
    Share on other sites

    Posted · Help with Cura settings

    So I wasted another 100 metres or so of filament on this print with combing turned off, there was very little stringing until it got near the top of the print and then it seemed to make thicker strings than all the previous attempts.


    So anyway I viewed the layer view preview with the travels shown and it was generating travel paths in seemingly random places that went across the print where there was no material to be printed (just like the print did), it looked like a spider had moved in and made a web. So then I sliced the same file for another printer I have and all travel paths were confined to places that had material printed, seemingly eliminating the opportunity for strings to be drawn across the void in the print.


    Then I loaded the model back into Cura with the original profile for the first printer and sliced it again with all the setting as they were when I was having problems and checked the travel paths and this time they are all on printed surfaces. Nothing changed except the way Cura decided to plot the travel paths. So it seems like Cura can sometimes plot the travel paths in a way that leads to stringing across a void.


    I don't know if it's a bug or just a random slicing error, it's never happened before. I will be sure to check the show travels box when I check the layer view from now on though.

  • 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

      • 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
          • Like
        • 3 replies
      • UltiMaker Cura 5.7 stable released
        Cura 5.7 is here and it brings a handy new workflow improvement when using Thingiverse and Cura together, as well as additional capabilities for Method series printers, and a powerful way of sharing print settings using new printer-agnostic project files! Read on to find out about all of these improvements and more. 
          • Like
        • 26 replies
    • Create New...