Jump to content

Why does Cura think my models are completely solid?


sim69

Recommended Posts

Posted · Why does Cura think my models are completely solid?

I have no idea what is going on with this, no idea what to look up to find answers, so I'm going to ask by myself. 

I am relatively new to 3D modelling, and made a mount for a motor using Sketchup. I know, Sketchup isn't great for 3D printing, but it is user friendly and more importantly: free. When I loaded in this small model to print and sliced it, it said it would take 40 minutes, so I previewed it only to realize it has made the model completely solid with infill all the way up to the top. I can't just set infill to 0 for obvious reasons, but, like, why? Is it my fault, Cura's fault, or Sketchup's fault? Posting this to a Sketchup forum too. Running ver. 4.6.0 for Mac. 

 

Attached are images of 1) The model, showing what it's supposed to look like, 2) The infill filling up what's supposed to be hollow and 3) The outer shell

Not pictured is the hole in the bottom, which also is completely ignored.

Screen Shot 2020-04-27 at 8.26.01 PM.png

Screen Shot 2020-04-27 at 8.26.25 PM.png

Screen Shot 2020-04-27 at 8.26.44 PM.png

  • Link to post
    Share on other sites

    Posted · Why does Cura think my models are completely solid?

    So sketchup specifies which part of every surface faces air and which side faces plastic.  This information is stored in the STL file as something called a "normal".  Your normals are backwards inside that part.  In sketchup you can tell because the surface is gray instead of white.  Right click on that surface and select "reverse faces".

     

    More sketchup tips for future models: https://i.materialise.com/blog/3d-printing-with-sketchup/

     

    If you are new to sketchup I suggest you switch to a solid modeling CAD versus sketchup which lets you create infinitely thin planes.  Normal CAD software does not let you do that.  Sketchup makes it work to seal up all solids - people often forget to seal in the bottom for example.  But if you are a sketchup expert then definitely read the advice in the above link.

  • Link to post
    Share on other sites

    Posted · Why does Cura think my models are completely solid?

    Ah thank you. On a sketchup forum I discovered it was actually the file format it was exported in. The faces were already right-side out, but I appreciate the link you provided. 

  • 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.
        • 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...