Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  

Slicing problems

Recommended Posts

Hi, I designed and have made many of these:


unfortunately after upgrading to an UM2 and thus getting round to installing Cura 14, the slicing now fails whereas it was working fine in versions of 13 (at least). Slicing completely misses some internal voids and fills them in (there are supposed to be 10 cubic voids at angles connecting to the five sides of this shape).

Is this controllable somehow, or is it likely to be a bug. I have other shapes that I used to be able to make fine, but now no longer work.


Share this post

Link to post
Share on other sites

It's fine to have cubic voids, but not double walls. Try robert's suggestion first, then look at the part in "xray" view. Any red areas are a problem. They are generated by passing a 3D line through the model and counting how many polygons it passes through. Even polygons are shades of blue and white. Odd polygons are shades of red. Red indicates an internal wall that doesn't have meaning or a hole in an intended wall.

If you have no red zones then unchecking all the "fix horrible" boxes should result in a perfect part. The exception is if you have to vertexes very close together (less than maybe .2mm). When Cura slices a layer it interesects a plane with your polygons (which are unordered in an STL file). Then it has a bunch of lines. It tries to figure out which lines intersect and tries to create loops of lines and assigns those together to be a "surface" but sometimes it gets confused if 3 or more vertexes are very close together.

Also STL files have an indication of the polygons which side is "inside" and which side is "outside". You can tell Cura to ignore that with one of the "fix horrible" settings.


Share this post

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
Sign in to follow this  

  • Our picks

    • How to 3D print with reinforced engineering materials
      Ultimaker is hosting a webinar where we explain how you can achieve and maintain a high print success rate using these new reinforced engineering materials. Learn from Ultimaker's Product Manager of Materials and top chemical engineer Bart van As how you can take your 3D printing to that next level.
      • 5 replies
    • "Back To The Future" using Generative Design & Investment Casting
      Designing for light-weight parts is becoming more important, and I’m a firm believer in the need to produce lighter weight, less over-engineered parts for the future. This is for sustainability reasons because we need to be using less raw materials and, in things like transportation, it impacts the energy usage of the product during it’s service life.
        • Like
      • 12 replies

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!