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

Infill questions

Recommended Posts

Few questions regarding infill:

1. What is the best way to do 100% infill?

For example, I can increase the number of walls (and hence have shorter/less "diagonal lines") or I can reduce the number of walls to 1 and use "diagonal lines" to do the filling?

Does it make a difference regarding the final strength?

2. Does the shape of infill have effect on the strength? For example slic3r offers lines, concentric, honeycomb etc.

3. Is there a "magic number" of infill that gives higher strength than similar, slightly higher values?

For example, at 25% infill Cura starts laying infill lines in one direction which changes every layer. Does this change have a significant effect on the strength, say compared to 24%?


Share this post

Link to post
Share on other sites

The answer to pretty much all questions is; We don't know.

We've not tested this, mostly because it's very hard to even quantify 'strength' (and what makes one object strong might dramatically fail for the next one).


Share this post

Link to post
Share on other sites

I have been beginning to wonder how much strength 100% infill actually offers over a spars infill, like 10%.

From a mechanics perspective, it probably increases the objects resistance to pulling or compressing, but not for bending.

For bending, most of the load is carried by the outer walls, instead of the core. The main function of the infill is to help the skin hold its shape, so it can't easily collapse or expand.

For stretching and compressing, the load is more evenly distributed. The most important thing is the total cross section of material that need to be compressed or pulled apart.

In practice, I am beginning to feel like anything over 20% infill is generally a waste.Unless there are special circumstanes, it is best to just design a part with slighty large diameter or increase wall thickness a little.

As for infill patterns, I would like to see some alternatives to the grid we have now. The grid leaves week spots and I don't like the look it lends to translucent material. One thing I would like to try is just randomly rotating the grid at each level, making a sort of rat's nest of overlapping fibers that fills the object by some %. Some other more complicated ideas I have scene on these forums are a pattern that would just form ribs along the walls or an algorithm that would do the grid but bend the lines near the wall, in order to form a curve that is tangent to the wall at the point of contact.

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

    • Introducing Ultimaker Cura 3.6 | Beta
      Ultimaker Cura 3.6 | Beta is available. It comes with new features, bug fixes, and UX improvements. We would really like to have your feedback on it to make our stable release as good as it can be. As always, you can download the beta for free from our website, for Windows, MacOS, and Linux.
        • Like
      • 95 replies
    • Print Core CC | Red for Ruby
      Q: For some users, abrasive materials may be a new subject matter. Can you explain what it is that makes a material abrasive when you are not sure which print core to use?
      A: Materials which are hard in a solid piece (like metals, ceramics and carbon fibers) will generally also wear down the nozzle. In general one should assume...
        • Like
      • 30 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!