Jump to content
Ultimaker Community of 3D Printing Experts

Cura Brim Bug?


cdrose
 Share

Recommended Posts

Posted (edited) · Cura Brim Bug?

Hi,

 

I've noticed a bug of sorts with the Build Plate Adhesion Type "Brim". It appears the "Brim Only on Outside" of the model doesn't work 100%.

 

Cura seems to place brim material around internal "islands" of the model so anything that loops around leaving material in the middle. To explain what I mean I've added screenshots of what happens when printing a model with text on the base such as the Benchy or the Banzai Bill model. There is brim material within the letters which "caps" them off.

 

Is there a fix for this? Can we have a feature where we can remove certain paths by clicking on them to delete?

 

Thanks

 

Untitled-1.jpg

untitled-2.jpg

Edited by cdrose
  • Link to post
    Share on other sites

    Posted (edited) · Cura Brim Bug?

    Indeed Cura makes the brim "outside" but it didn't recognice correctly what is "inside".

    There are quasi "insides inside insides", tried to visualize this here:untitled-2.jpg.d8c6d31d22633e8b68c641077702d7e1.jpg.63519fce2f74e99af7dd74c10b8fbe60.jpg

     

    If you set the brimline-count to 1 or 2 it becomes better visible how cura thinks, for example the "O"

    Auswahl_103.png.3003a3cbe55a634050758e36c6675647.png

     

    Because there is part 1 inside part 2 there "must" be A the outline for part 2

    and B the outline for part 1

    Edited by berndjm
  • Link to post
    Share on other sites

    Posted · Cura Brim Bug?

    It should run a script to detect the next closest edge, if it finds one then don't place brim in there. We should be able to adjust this detection. Therefore when it traced outside the model it would reach the edge of the build plate and know that part was the outside of the model.

  • Link to post
    Share on other sites

    Posted · Cura Brim Bug?

    I am not sure that would be wise to try to implement. Right now, it seems to be following the same rules as programs such as Illustrator use to determine inside and outside.

     

    Rather, I think it would behoove the use to use the settings in Cura to use a secondary object to modify settings of the first object by eliminating the brim. I will see if I can set a thing up to demonstrate what I mean. And, see if theory and reality meet square on.

  • Link to post
    Share on other sites

    Posted · Cura Brim Bug?
    Quote

    Therefore when it traced outside the model it would reach the edge of the build plate and know that part was the outside of the model

     

    I think it's not so easy to detect the "real outside" and at the same time handle cases where the currently behavior makes sense.

    See this simplified use-case:

    Auswahl_104.png.dfe4f132cd4901cc49f100e95bf95ec3.png

    Here it could be helpful to have the brim also inside the object.

     

    I think to have a adjustable threshold (is this the right word?) for the outside detection would be nice ... but how to handle than the two parts close together like in your 2nd screenshot?

  • Link to post
    Share on other sites

    Posted · Cura Brim Bug?

    I tried to do what I thought would be possible. Again, reality and theory did not mate up nicely. Here was my train of thought:

    (A)

    This is a selection that would be a problem with brims. This would not be fun to trim out as it is a thin object and tiny in detail.

    InsideOutsideIssue.thumb.jpg.8e552588c84e3c54ebf4b941946a4c97.jpg

    (B)

    So I was thinking that instead of trying to make the software do something that would be really a pain to operate precisely based on the idea that @berndjm showed in the post above; When is it good/not good to have software decide what is inside or outside? My theory was to use the new feature that allows one model to modify settings of another model. This is in the 'per model settings' dialogue. I have found this to be really most useful in a variety of ways. It has easily become my favorite feature and I use it in almost everything right now.

    Ooopsy.thumb.jpg.bd0d354ca3f5d03c2a7716fde939636c.jpg

     

    But, as reality will often do, it will not work because it turns out that brim is not a per model setting. This may be easier to implement though than try to set some sort of other option.

  • 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
     Share

    • Our picks

      • New here? Get ahead with a free onboarding course
        Hi,
         
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 8 replies
    ×
    ×
    • Create New...