Jump to content

Cura fails, or am I missing something?


Recommended Posts

Posted (edited) · Cura fails, or am I missing something?

I have a model that looks right in the preview of Cura.

When printed, it turned into a mess and here's why:

Left a screenshot of Cura, The right one a slice off of http://gcode.ws/

 

Pegprob1.gif.402fa80bcf67f78c024739fa7e1b35b6.gifPegprob2.thumb.gif.e127c66a52ff6258920751444c801eb5.gif

 

Am I missing something?

 

 

 

Pegprob1.gif

Pegprob2.gif

Edited by Umo_Alex
  • Link to post
    Share on other sites

    Posted · Cura fails, or am I missing something?

    The red on the rop of the ring shows at least part of the problem. cura is thinking it needs to support the top of the arch. Normally support should only show on bottom surfaces.

     

    I suspect this means the normals of the mesh are reversed.

     

    look in the marketplace for Mesh Tools. 

     

    Others can likely give give more explicit directions.

     

     

  • Link to post
    Share on other sites

    Posted · Cura fails, or am I missing something?

    @johnse is correct that the normals of the model seem to be incorrect, however they don't affect slicing. Normals are only used for visualisation.

     

    From the looks of it, your model is not "manifold". I think you modeled the torus and the cylinders and just moved them so they look like they make a whole. However, you did not join (or union, or boolean, or something else, depending on the modeler you use) the shapes so they don't actually form a single geometry. As is, the cylinder geometry just extends into the torus geometry, so you have what is called "internal geometry".

     

    When slicing, Cura makes cross-sections of the model. Looking from the outside in, the first edge-loop it encounters will be an outer wall. Going in, if it encounters another edge-loop, that will become an inner wall of a hole. Etc. In your case, because you have (sub)objects intersecting eachother, Cura simply looses track of what should be the outside and what should be the inside.

     

    Long story short: Cura fails to meet your expectation because your model is "wrong". Just because it displays well does not mean that it is suitable for printing.

    • Like 1
    Link to post
    Share on other sites

    Posted · Cura fails, or am I missing something?
    22 hours ago, Umo_Alex said:

     

    Thanks for your explanation. I'm using FreeCAD for moddeling. I guess I'll have to somehow clip the cylinders with the torus...But that's beyond the scope of this forum.

  • Link to post
    Share on other sites

    Posted · Cura fails, or am I missing something?

    In FreeCAD, the function you are looking for is making a Union of two shapes

     

  • Link to post
    Share on other sites

    Posted · Cura fails, or am I missing something?

    Yay, that works, thanks! For some reason the fillet on the base I created in the Part Design workbench got lost, though.

    Recreating it in the Part workbench fixed it.

     

    Pegprob3.gif

  • Link to post
    Share on other sites

    Posted · Cura fails, or am I missing something?
    6 minutes ago, Umo_Alex said:

    For some reason the fillet on the base I created in the Part Design workbench got lost,

     

    Are you sure you had the whole part selected when you exported the STL?

  • Link to post
    Share on other sites

    Posted · Cura fails, or am I missing something?

    Couldn't get the fillet working in FreeCAD itself.

  • Link to post
    Share on other sites

    Posted · Cura fails, or am I missing something?

    The slice you’ve shown is going to have problems with the bottom curve. It looks like you have generate support touching buildplate instead of everywhere. The upper arch may build ok with bridging, but the bottom of the circle will be literally printing on air generating spaghetti.

  • Link to post
    Share on other sites

    Posted · Cura fails, or am I missing something?

    Correct. That print failed. I changed support to everywhere and it printed ok. 💩😃

  • Link to post
    Share on other sites

    Posted · Cura fails, or am I missing something?
    7 hours ago, Umo_Alex said:

    Couldn't get the fillet working in FreeCAD itself.

    I've recreated the problem in an example, in case anyone is interested.

     

    FusionFilletProblem.zip

  • 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

      • 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
      • Ultimaker Cura 5.6 stable released
        Cura now supports Method series printers!
         
        A year after the merger of Ultimaker and MakerBotQQ, we have unlocked the ability for users of our Method series printers to slice files using UltiMaker Cura. As of this release, users can find profiles for our Method and Method XL printers, as well as material profiles for ABS-R, ABS-CF, and RapidRinse. Meaning it’s now possible to use either Cura or the existing cloud-slicing software CloudPrint when printing with these printers or materials
        • 48 replies
    ×
    ×
    • Create New...