<p>I'm fairly convinced that gyroid is the best infill for a lot of purposes, and use it regularly now, but both conceptually and anecdotally, it doesn't seem very good for reinforcing inter-layer adhesion. Each layer is essentially an overhang of the previous layer, and at one step in each period there's even a bridge, meaning that the layers do not get pressed tightly together during printing.</p>

<p>Is there any data on how different infill patterns perform against tension perpendicular to the Z-axis, or angular around the Z-axis, which generally results in layers separating? I would guess "2D" infill patterns provide the best strength here, and I could experiment with it myself, but I'd like to know if it's already been tested.</p>

CC BY-SA 4.0
2019-05-26T21:30:33.613Z
All tests that I've seen test the shear stress of the infill. Loading parts in Z direction means that you would test the inter-layer strength, which is prone to failure as in effect in between every Z layer you have a crack initiation point.
0scar
CC BY-SA 4.0
2019-05-26T22:09:36.390Z
@0scar: For what it's worth, I just had amazing results with PETG and triangles infill here: https://3dprinting.stackexchange.com/q/10035/11157
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2019-05-27T05:22:48.883Z
I think I need to get myself a low-range torque wrench and do some measurements...
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2019-06-01T17:11:33.207Z
Reminder to self or others for something to test: increasing `infill_line_width` to something like double nozzle size to see if it gets better layer adhesion with 3d infills. If this makes gyroid comparably strong, it would be a small net material cost vs 2d infills (if any cost at all) and a big win for print time.
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<infill><print-strength>
Best infill for inter-layer adhesion
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# Best infill for inter-layer adhesion

(Asked by: username_0 on 2019-05-26)

I'm fairly convinced that gyroid is the best infill for a lot of purposes, and use it regularly now, but both conceptually and anecdotally, it doesn't seem very good for reinforcing inter-layer adhesion. Each layer is essentially an overhang of the previous layer, and at one step in each period there's even a bridge, meaning that the layers do not get pressed tightly together during printing.

Is there any data on how different infill patterns perform against tension perpendicular to the Z-axis, or angular around the Z-axis, which generally results in layers separating? I would guess "2D" infill patterns provide the best strength here, and I could experiment with it myself, but I'd like to know if it's already been tested.

**Tags:** infill, print-strength

> **Comments:**
> **username_1**: All tests that I've seen test the shear stress of the infill. Loading parts in Z direction means that you would test the inter-layer strength, which is prone to failure as in effect in between every Z layer you have a crack initiation point.  
> **username_0**: @username_1: For what it's worth, I just had amazing results with PETG and triangles infill here: https://3dprinting.stackexchange.com/q/10035/11157  
> **username_0**: I think I need to get myself a low-range torque wrench and do some measurements...  
> **username_0**: Reminder to self or others for something to test: increasing `infill_line_width` to something like double nozzle size to see if it gets better layer adhesion with 3d infills. If this makes gyroid comparably strong, it would be a small net material cost vs 2d infills (if any cost at all) and a big win for print time.  

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## 0 answers

