Cura fills internal hole

[AGrau95 0]

Good morning all. I'm trying to print this simple piece but when I slice it the internal hole gets filled by Cura as if it didn't exist.

 

The model is watertight.

 

I tried also to disable Union overlaping volumes without results.

 

Can somebody point me in the right direction?

TRD_spiral_stairs.stl

[gr5 2,170]

Well I see no red in your xray view which is great.  so it's the "normals".  Each triangle in the STL file has a "normal" which tells cura which side of the triangle is air and which side is solid part.

 

I have 18 solutions but it would be easier if you told me what CAD you used.  Or if it you got this from someone else.

[AGrau95 0]

It's from thingiverse. 

 

https://www.thingiverse.com/thing:3180500

[gr5 2,170]

Ah.  Okay - so just run it through a repair service.

 

netfabb free repair service is here (you have to create a free account first):
https://service.netfabb.com/login.php

Here's another service - drag and drop mesh repair service:
https://3d-print.jomatik.de/en/index.php

 

 

Also - don't use raft.  Ever.  It's an old technology that is only needed with obscure materials like PEEK and even then shouldn't be used.

[AGrau95 0]

Thank you for your time, I tried your suggestion, but the problem persists.

 

I also tried to remesh it with blender. Same results.

[Cuq 198]

As this model doesn't have any issue as well as I don't have any problem to slice it. I think you have activated in your profil the option Mesh Fixes-> Remove All Holes.  Uncheck this option to get the right result

Edited June 1, 2020 by Cuq

[AGrau95 0]

It was already unchecked

 

[Cuq 198]

In my case Cura 4.6.1 :  Your model with the option Unchecked /Checked

 

[Cuq 198]

An other origin to your issue can be in the section Experimental  -> Make Overhang Printable     

 

[AGrau95 0]

Thank you so much, this was the issue. I may have left it checked when I was toying around. 😄

 

Have a nice day!

[gr5 2,170]

@cuq - nice find!  I guess we should have asked him for his 3mf project file!