Jump to content

Wall ends not joining with 0.7mm layers - asking for hints


danielkschneider

Recommended Posts

Posted · Wall ends not joining with 0.7mm layers - asking for hints

Hi, I am printing 0.7mm and 0.6mm layers with a 0.7mm nozzle. Some outer wall ends do not join well, typically small circles that you would find underneath duplo compatible pieces. Right now, I got retraction = off, skin overlap percentage = 20 (0.14mm) and extrusion = 100%. The walls themselves and walls with infill context nicely and I print rather slowly, i.e. about 33 mm/s.

 

Any ideas what I should do, e.g. define negative extrusion ? I am aware that this is a problem influenced by how much (little) plastic the printer can push through and I am just asking if someone has a good "trick" for my problem. Also, the previews look just fine, lines are joined.

 

Cura version 4.8.0 on Ubuntu 18, Felix Pro 2 printer

 

PS: In case you wonder why I print Lego and Duplo compatible pieces so coarsely: I just want to create lots of pieces in reasonable time and the ones I do fit nicely and are functional.

endsNotJoining.jpg

doblos.jpg

  • Link to post
    Share on other sites

    Posted · Wall ends not joining with 0.7mm layers - asking for hints

    Cura has a bit of trouble on thin walls like that that are slightly wider than line widthX2.  I assume your line width is 0.7 and so if those internal duplo walls are 1.5mm then there is a .1mm gap.  There is a new alpha version of Cura that supposedly does better with this sort of thing here - called arachne:

    https://github.com/Ultimaker/Cura/tags

     

    It has lots of buts but might do better.  But a better solution is to use this tried and tested version of Cura from one of our community members which does MUCH better on thin walls like this.  I use his versions of cura much more often than the Ultimaker version.  It's quite safe.  I met the guy in person:

    https://github.com/smartavionics/Cura/releases

  • Link to post
    Share on other sites

    Posted · Wall ends not joining with 0.7mm layers - asking for hints

    Hi, thanx much for the help, but this is not my problem (I should have explained better !). The walls do join, but the ends of the walls do not. I attach a new picture that shows the problem better.

    Actually (after posting) I now have the hypothesis that the pressure in the nozzle may not be enough and that there is a short lapse before the printer starts extruding after a jump.

    cura-wall-ends.jpg

  • Link to post
    Share on other sites

    Posted · Wall ends not joining with 0.7mm layers - asking for hints

    Hi thanx again.

     

    No, coasting was not enabled. So, my conclusion is that this has to do with extruder mechanics.

    For example, the extruder could lack sufficient pressure to push out the plastic in time when it starts a line or there is some unwanted retraction (by the plastic itself and not the extruder) when traveling.

     

    Heating more (e.g. 230 for PLA) should help a bit, I have "heard" some folks printing PLA at 240^C when printing with large nozzles and will try that too. I don't want to add more extrusion since it leads to messy knobs.

     

    Other than printing with smaller layers (e.g. 0.56mm for a 0.7mm nozzle) I don't have a solution, yet 🙂

  • 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 Universal Cura Projects in the UltiMaker Cura 5.7 beta
        Strap in for the first Cura release of 2024! This 5.7 beta release brings new material profiles as well as cloud printing for Method series printers, and introduces a powerful new way of sharing print settings using printer-agnostic project files! Also, if you want to download the cute dinosaur card holder featured below, it was specially designed for this release and can be found on Thingiverse! 
          • Like
        • 10 replies
      • S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
        (Sorry, was out of office when this released)

        This update is for...
        All UltiMaker S series  
        New features
         
        Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
          • Like
        • 0 replies
    ×
    ×
    • Create New...