This 3D Printer infill is the strongest (3D Printer Academy Tested - Episode 2)

5 years ago Stefan at CNC Kitchen did testing on infills. His results were similar to yours, however, he also took time to print into consideration, which eliminated both honeycomb infills, as they took 3x as long to print. That left Gyroid and Cubic the recommended infills.

Might also be interesting to know how strong the infills are in another axis. From my experience Gyroid is quite good in all directions. But it's nice to see that still if you want strenght, you add walls.

It's a fallacy that the optimum point for two parameters is where their 2D curves cross over. It's actually the peak of a 3D solution space describing the strength to weight at every combination of infill and wall count.

You should probably normalize infill percentage so all the parts will have exactly the same weight, then "Strength/Weight" will be the most important stat because weight will be the same!

Suprised no one has mentioned this, but apparently hexagons, are still, the bestagons

Gyroid makes the most sense to me, because it's not only very strong, but it's also very quick to print because the pattern can be laid down continuously as much as possible. Thanks for taking the time to do these tests and report your findings, it's really helpful.

Sorry, you missed to show in what direction the infill was oriented in the test. It makes a difference if you apply bending on a part in original z or y direction. If your profile would have been asymmetic i could see by myself, but as you use a square profile, it is hard to precisely make out, which direction is used.

Funny how a week ago I was looking for this exact video because a prototype of mine with gyroid infill just snapped easily, then I printed again with 3D Honeycomb (adds 14% more grams, ABS) and it's probably 3x as strong. One of the important things to look into is the orientation of it, as gyroid infills print 4 layers per "switch in infill directions" so for every 4 layers it's pretty snappable into a spaghetti-looking remains. Shape, material, and walls play proportional parts altogether as well in achieving the most efficient prints

I always taught my students to use gyroid for solid objects for the better aesthetics when visible through walls and stronger strength with the same material use as triangles. So glad to see your results supported my experience!

Great experiments! I especially like how you designed the 3 point tester. One minor thing is that intersecting the graphs like at 4:05 isn't the best way to optimize. Imagine if one graph were a horizontal line and the other graph curves above it. The best place would be at that peak, not where they intersect. So I'd pick from the peaks in each graph.

It would also depend on the direction of force. If you only need to support weight in one direction that is simple, but if force can be applied in any direction that is another thing.

Lighting for the win!!! Regardless of the reason. I'll have to do some further testing.

Missed the opportunity to test out adaptive cubic at high infill percentage. It scales up differently than the rest, only increasing density near the walls. Whenever i need an incredibly stiff part i do adaptive cubic at 99% infill with three walls.

Thanks, I appreciate you taking the time and effort to do this

Good video. I'm not completely convinced that the intersection point is the most optimal, though. It would be interesting to see strength when weight is kept equal and strength tests for both axes.

Really interesting tests, yes please do more of this! I'd personally like to see the top performing infills tested again with different filaments to see how dependent the infill is on rigidity. I'd also be curious to see if the ideal infill percentage varies with each infill geometry.

Great video! I really liked how straight forward and well structured you presented your results, without additional stuff to artificially lengthen the video. Great that you put so much effort to get some knowledge for the community. I would really like to see more. For example it would be interesting to see how well the different infill pattern perform when it comes to multilateral forces applied.

This is awesome!!!! I love 3d printing soo much and i love to see new ways to use and adapt to life. Fantastic video!!!!

Fantastic video and format. Pure science. Thank you.

When I got started with printing I admit that at first I really only looked at what infill looked the coolest and chose Gyroid. Then I though about it and drew the conclusion that Gyroid must also be one of the strongest infills since it redirects the force away from the direction it is trying to travel in, strengthening the piece as it does. It works kind of like the straws that Mark Rober used in his egg drop video.