Jump to content

Cura Filling in the bottom layer?


Dacraun

Recommended Posts

Posted · Cura Filling in the bottom layer?

FYI, I'm using Cura 4.12.0.

 

I've never had an issue while slicing before where I stood as clueless as now...
I've recently downloaded a lovely cat-shaped cookie-cutter from thingiverse and endeavored to print it.

However, for some obscure reason, Cura seems hellbent on filling in the entire bottom layer with filament, where it should be just an outline.

I've printed circles and cylinders and various other hollow shapes before, without a hint of an issue, but this somehow eludes me.

 

It looks hollow on the preview, it looks hollow if I try to open the STL on solidworks, but as soon as it's sliced... Look for yourself, I've attached pictures.

 

image.thumb.png.b8ae4694d8434088e929bce6106eacd1.png

image.thumb.png.3a1cb7aa8aea5d3970a20822210e1fe3.png

image.thumb.png.f5493733f5a25dfa879d1a18f4a38fbc.png

 

I've tried using some of the default slicing settings, thinking it might be something I changed by accident, but the default cura settings result in the same thing...

I've attached the STL file as well, in case you want to give it a try on your own.

 

Ausstecher_katze.stl

  • Link to post
    Share on other sites

    Posted · Cura Filling in the bottom layer?

    The problem is that the model has conflicting "normals". The top of the model (the "walls") has the normals facing outward, the bottom (the modeled "brim") has the normals facing inward. This confuses Cura. You can sort of see this because the top section has a red "overhang" indication on top, instead of on the bottom.

     

    The easiest fix is to download the Mesh Tools plugin from the marketplace (if you don't have it already), select the model and right-click. Then select Mesh Tools -> Fix model normals. After that the model will slice properly.

    • Like 2
    • Thanks 1
    Link to post
    Share on other sites

    Posted · Cura Filling in the bottom layer?

    If you look carefully at this image (that you posted yourself), you can also see that there is an issue with the normals. Looking at the small section between the tail and the head of the cat from below, you see that you are looking "through" the wall as if it did not exist, and then instead you see the insides of the wall. It looks asif you are staring into a box, as it were. This is due to what is called "backface culling"; the application that made this image did not draw the "back" of the faces. Since all the faces are "inverted", only the "insides" of the walls get drawn.

    image.png.d1d133cd0d4acfba3620650206c84e

    • Like 1
    Link to post
    Share on other sites

    Posted · Cura Filling in the bottom layer?

    That did the trick.
    I didn't really flinch at the strange representation in SW, since it sometimes loads models that actually slice correctly in a strange manner. But the Mesh Tools extention with 'Fix Normals' did indeed fix the stl model for slicing.

    So you're definitely right.

     

    Thanks a lot for your help. ❤️

  • 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...