Jump to content

Unnecessary support structures in Cura


Patronus

Recommended Posts

Posted (edited) · Unnecessary support structures in Cura

image.thumb.png.9bd0dc387f75e9c290e98ea0cbcc9bf7.pngimage.thumb.png.0e18959f88cfb01306f670b9fd8ebcb9.png             image.thumb.png.94755ed61f5bf52c7f624acb923c98a2.png

Why would Cura generate support where clearly it isn't needed? In the first two pictures it's a bit hard to see but support starts against an almost vertical wall (the side of a large hole) where it's not necessary at all, in fact it can't even be printed there because it never touches the part so I have all these loose extrusions sitting all over my part as it tries to print it in mid air.

In the third picture it's quite evident that a tall support beam is generated for no reason at all. Again it's not even touching the part and only takes time & material to print.

Support horizontal expansion only makes these support structures a bit wider/narrower but doesn't take them away. Is there anything I can do to remove these unnecessary supports (other than manually)?

Edited by Patronus
  • Link to post
    Share on other sites

    Posted · Unnecessary support structures in Cura

    What are your overhang settings? That will greatly influence how much, and where, supports are added. And, then there is the support's horizontal expansion. This will greatly influence other aspects of the support structure.

     

    As or the support not touching, I am going to venture that is a limitation of the graphical representation. I have seen that on my slices and not had an issue with contact in the actual print.

     

  • Link to post
    Share on other sites

    Posted (edited) · Unnecessary support structures in Cura

    My overhang is at 55 degrees and as I said the horizontal expansion has no effect on this, apart of course from making it thicker/narrower along with the rest of the support. These supports appear on what looks like a 10 degree overhang or even less.

    As for the support not touching, it is not a just graphical representation, it does not touch the part in real life also. As I said in my original post, the fact that it tries to print the support in mid air creates lots of loose extrusions all over my part.

    Edited by Patronus
  • Link to post
    Share on other sites

    Posted · Unnecessary support structures in Cura
    28 minutes ago, Patronus said:

    and as I said the horizontal expansion has no effect on this

    I was just mentioning this to reinforce the notion, no other reason.

     

    28 minutes ago, Patronus said:

    As for the support not touching, it is not a just graphical representation, it does not touch the part in real life also.

    Then, this is of note for team ultimaker

     

    29 minutes ago, Patronus said:

    As I said in my original post, the fact that it tries to print the support in mid air creates lots of loose extrusions all over my part.

    Wow...a bit snippy in that as I get that you said things, but just tried to offer a holistic approach as my experience dictates. It is rarely just one thing such as my experience with the 'non' touching thing. As for 'printing in mid air' I see the support going all the way to the base on the right hand image. Or, am I looking at the wrong image, because everything else looks like it is settled on some sort of edge.

     

    Also, have you just tried the support blocker?

  • Link to post
    Share on other sites

    Posted (edited) · Unnecessary support structures in Cura
    4 hours ago, Patronus said:

    Why would Cura generate support where clearly it isn't needed?

     

    Because of a bug. Cura is extending the support that is needed on the top of the model all the way down to the buildplate, disregarding the fact that it intersects with the model.  I've read that this has been "mostly fixed" (whatever that means) for Cura 4.0 (but not yet in Cura 4.0 beta 1).

     

    Edit: support blockers will not fix this.

    Edited by ahoeben
    • Like 1
    Link to post
    Share on other sites

    Posted · Unnecessary support structures in Cura
    2 minutes ago, kmanstudios said:

    Well, phooey.

     

    Well, one could use support blockers to remove the support for the top hole. Arguably that probably prints ok without support.

  • Link to post
    Share on other sites

    Posted · Unnecessary support structures in Cura

    For details on the bug. see https://github.com/Ultimaker/Cura/issues/5156

    Turns out the fix may already be in Cura 4 beta 1

  • Link to post
    Share on other sites

    Posted · Unnecessary support structures in Cura

    @kmanstudios sorry I didn't mean to be snippy and appreciate your interest. It's only the support in pic 1 and 2 that hangs in mid air. The support in pic 3 prints fine.

    @ahoeben sounds like the bug you refer to is causing this problem. If Ultimaker are working on a fix then I'll wait for it.

    • Like 1
    Link to post
    Share on other sites

    Posted · Unnecessary support structures in Cura
    10 minutes ago, Patronus said:

    kmanstudios sorry I didn't mean to be snippy and appreciate your interest.

    ❤️

     

    Yeah, I have  a hard time reading intent (even in real life), so I really appreciate that 🙂

     

    @ahoeben strikes 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

      • 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...