Jump to content
UltiMaker Community of 3D Printing Experts

Why does Cura think my models are completely solid?


sim69
 Share

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
     Share

    • Our picks

      • Here it is. The new UltiMaker S7
        The UltiMaker S7 is built on the success of the UltiMaker S5 and its design decisions were heavily based on feedback from customers.
         
         
        So what’s new?
        The obvious change is the S7’s height. It now includes an integrated Air Manager. This filters the exhaust air of every print and also improves build temperature stability. To further enclose the build chamber the S7 only has one magnetically latched door.
         
        The build stack has also been completely redesigned. A PEI-coated flexible steel build plate makes a big difference to productivity. Not only do you not need tools to pop a printed part off. But we also don’t recommend using or adhesion structures for UltiMaker materials (except PC, because...it’s PC). Along with that, 4 pins and 25 magnets make it easy to replace the flex plate perfectly – even with one hand.
         
        The re-engineered print head has an inductive sensor which reduces noise when probing the build plate. This effectively makes it much harder to not achieve a perfect first layer, improving overall print success. We also reversed the front fan direction (fewer plastic hairs, less maintenance), made the print core door magnets stronger, and add a sensor that helps avoid flooding.
         

         
        The UltiMaker S7 also includes quality of life improvements:
        Reliable bed tilt compensation (no more thumbscrews) 2.4 and 5 GHz Wi-Fi A 1080p camera (mounted higher for a better view) Compatibility with 280+ Marketplace materials Compatibility with S5 project files (no reslicing needed) And a whole lot more  
        Curious to see the S7 in action?
        We’re hosting a free tech demo on February 7.
        It will be live and you can ask any questions to our CTO, Miguel Calvo.
        Register here for the Webinar
          • Like
        • 11 replies
      • UltiMaker Cura 5.3.0-Alpha 🎄 Tree Support Spotlight 🎄
        Are you a fan of tree support, but dislike the removal process and the amount of filament it uses? Then we would like to invite you to try this special release of UltiMaker Cura. Brought to you by our special community contributor @thomasrahm
         
        We generated a special version of Cura 5.2 called 5.3.0 Alpha + Xmas. The only changes we introduced compared to UltiMaker Cura 5.2.1 are those which are needed for the new supports. So keep in mind, this is not a sneak peek for Cura 5.3 (there are some really cool new features coming up) but a spotlight release highlighting this new version of tree supports.  
          • Like
        • 17 replies
      • 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
        • 14 replies
    ×
    ×
    • Create New...