Gyroid infill without perimeters
 
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Anachronist
(@anachronist)
Estimable Member
Gyroid infill without perimeters

I'm visiting my parents, and my father showed me a small lamp that needs a new lampshade. I thought of printing one as a gift for him, using just a gyroid infill pattern with no perimeters, printed with a semi-translucent filament.

The problem is, PrusaSlicer adds perimeters to bits and pieces of any infill pattern, even if you set perimeters to zero.

I've seen others manage to print an infill pattern by itself. Is this capability available in other slicers?

Posted : 06/12/2020 4:43 am
Vojtěch Bubník
(@vojtech-bubnik)
Admin
RE: Gyroid infill without perimeters

You may try the https://github.com/prusa3d/PrusaSlicer/releases/tag/version_2.3.0-beta2

and reduce infill anchoring length using the new infill anchoring parameters (only available in advanced / expert mode)

 

Posted : 06/12/2020 6:00 am
fuchsr
(@fuchsr)
Noble Member
RE: Gyroid infill without perimeters

Couple of other thoughts:

Does it have to be gyroid? You may have more luck with other infill patterns.

Can you flip the model on its side? In my hands, I've been more successful printing without top and bottom layer than without perimeters.

Posted : 06/12/2020 12:29 pm
Peter
(@peter-16)
New Member
RE: Gyroid infill without perimeters

Sorry to say, but Cura...

Just remove the wall thickness, the top and bottom layers.

Posted : 06/12/2020 3:12 pm
JoanTabb
(@joantabb)
Moderator
RE: Gyroid infill without perimeters

Gyroid May not be a good choice...
I left some top and bottom layers to leave neat edges and somewhere to mount the light fitting

this is in Prusa Slicer 2.3.0 beta1 

I used a low infill ratio so the image would be clearer

a higher infill ratio will join more cells together...

regards joan

Attachment removed

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 06/12/2020 4:30 pm
JoanTabb
(@joantabb)
Moderator
RE: Gyroid infill without perimeters

 
3d Honeycomb has more interconnects

2D  (BASIC) Honeycomb may be easier to print!

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 06/12/2020 5:39 pm
Anachronist
(@anachronist)
Estimable Member
Topic starter answered:
RE: Gyroid infill without perimeters

Thanks everyone. PrusaSlicer 2.2 certainly won't do it. I didn't know there was a 2.3 beta available. I've been meaning to check out Cura too, but had never gotten around to it because up until now, PrusaSlicer has done whatever I needed.

I'll experiment with different infill patterns. I know gyroid has problems with overhanging layers at low densities. Hex or cubic might work nicely too.

My idea is to have a rather thick lampshade with a space hollowed out that rests on top of the LED bulb. It's a very small bedside lamp. The LED won't get too hot, but still probably too warm for PLA. Printing in natural PETG would look nice, I think.

Ideally I would be figuring out how to generate a gyroid surface of any arbitrary thickness in OpenSCAD, and then I could rotate and orient the pattern as I please. But after dabbling with the deceptively simple gyroid formula, I concluded that would be a very heavy lift.

 

Posted : 07/12/2020 5:48 am
Joey
 Joey
(@joey-2)
Estimable Member
RE: Gyroid infill without perimeters

I have a Solidworks model of gyroid and am glad to send it to you. Then you can mirror, extrude cut, scale, etc. to get your lampshade.

Let me know the file extension.

Mk3 - 1X
Mk3S - 2X
2021 Hyundai Palisade
Wife - 1X

Posted : 07/12/2020 12:37 pm
Joey
 Joey
(@joey-2)
Estimable Member
RE: Gyroid infill without perimeters

Have you looked for a gyroid on grabcad.com?

Mk3 - 1X
Mk3S - 2X
2021 Hyundai Palisade
Wife - 1X

Posted : 07/12/2020 12:39 pm
sfRay
(@sfray)
New Member
RE: Gyroid infill without perimeters

The solution is to set the maximum lenghth of the infill anchor to a low value.

Posted : 12/05/2022 7:58 am
Anachronist
(@anachronist)
Estimable Member
Topic starter answered:
RE: Gyroid infill without perimeters
Posted by: @sfray

The solution is to set the maximum lenghth of the infill anchor to a low value.

Yes, that feature became available in PrusaSlicer after I posted my initial thread.

In the meantime, I have come up with a better gyroid based on triangle waves instead of sine waves. It's an interesting faceted surface, and would be ideal for 3D printing because it eliminates the horizontal slope at the saddle point of the regular gyroid. In fact, I verified that if this gyroid is stretched 2X in the Z direction, all surfaces conform to the 45° rule.

My biggest problem is, in spite of weeks of hard work, I just cannot figure out how to modify the gyroid infill in PrusaSlicer to use this. PrusaSlicer generates some weird gaps when I try it.

Posted : 12/05/2022 2:50 pm
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