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Gap between wall and infill when using settings modifier


krikru

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Posted (edited) · Gap between wall and infill when using settings modifier

Hi,

 

I have a model in which I want to fill in some parts completely, i.e., 100% infill density. To achieve that, I use extra models which I set to "Modify settings for overlap," place them over the regions I want completely filled, and choose "Infill Density" 100%. However, when I preview the first layer that is not a bottom layer (see inserted image), I notice that there is a small gap between the wall and the infill, which I suspect will weaken the model (which is the opposite of what I want!).

 

Where does this gap come from and how can I get rid of it?

 

There is no such gap between the wall and the bottom in the bottom layers (which are just below the layer currently being previewed).

 

WallInfillGap.thumb.png.a24050a3bdf278a94763191105139378.png

Edited by krikru
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    Posted (edited) · Gap between wall and infill when using settings modifier

    Hello? Can anyone in this community please explain this behavior? And how to remove the gap? I have also marked this as a bug, so I think that some developer should at least take a look at it if no one can explain why this happens!

     

    I'm using Cura 4.10.0.

    Edited by krikru
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    Posted · Gap between wall and infill when using settings modifier

    Gap.3mf

    I created a minimal working example and uploaded that. I attached an image showing a gap where there is supposed to be no gap IMO and that would weaken the print considerably.

     

    Gap.thumb.png.b95cae7eaa84ab438ef9c8e9861b3881.png

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    Posted · Gap between wall and infill when using settings modifier

    Sorry.  I forgot about this.

    I did play with it and I couldn't get the gap to go away.  Go over to GITHUB and post a bug report.  Do a complete write up and post the project file.

    As a work-around did you try using a Cutting Mesh set to 100% infill?

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    Posted (edited) · Gap between wall and infill when using settings modifier

    Why should I do that work? Doesn't Ultimaker care about Cura enough to do it themselves? I have taken the time to describe the issue completely here and you were able to reproduce it. Going to Github and reporting the bug there shouldn't be a problem for any Ultimaker developer.

    Edited by krikru
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    Posted · Gap between wall and infill when using settings modifier

    I'm not a developer, I'm a Cura user.  If a bug report isn't made then how would the Ultimaker Team know there is a potential problem?

    Furthermore, on a personal level I don't see that .2mm gap as a problem and I don't agree that it would  "...weaken the print considerably".  In an actual print the gap may not even be there.

    And thirdly, the situation doesn't occur with Cura Arachne and so maybe it has already been addressed.  Cura 5.0 Beta is out today.

     

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    Posted · Gap between wall and infill when using settings modifier

    Okay, I apologize but I assumed that either you were a developer or that at least the developers would read the threads that had been tagged as "Bug" here, since this is Ultimaker's own forum.
     

    About the gap in the model, I'm not a structural engineer, but I think a 0.2 mm gap between lines that are only 0.4 mm wide themselves can potentially have a quite large impact. Similar to how Cura ensures that a support comes off easily by adding a vertical gap between the model and the support, I think the bonding between the two extrusion lines is likely to be compromised if there is a horizontal gap between them and act as a weak spot should the model need to take some load (if the two lines wouldn't even touch physically, there wouldn't be any bonding to speak of at all). When watching some of CNS Kitchen's videos (this channel investigates how different print settings and methods affect model strength; I can recommend it if you haven't seen it), it becomes apparent how much different things can affect printing strength.

     

    Hopefully you're right though and that it's fixed in Cura Arachne.

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