Prusa Slicer fills in hole in my model - Manifold = yes
 

Prusa Slicer fills in hole in my model - Manifold = yes  

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dan007
(@dan007)
New Member

Hi,

I have what I consider a basic model (see file) and the slicer fills in the hole in the center (imports the stl file ok).  Manifold display says Yes. I've changed quite a few parameters trying to solve, then reverted to basic standard configs to no avail.

I do NOT master the printer options so I must be doing something wrong but can't see it.

TIA.  

PrusaSlicer 2.2.0 for Mac OS X (Catalina 10.15.6).

base_dessus.stl

Best Answer by jsw:

Try this one.  See attached file.

The original .stl is most definitely corrupt, as it will not convert to a solid in FreeCad.  I used a trick of converting the mesh to a shape and re-exporting it.  The resulting file will convert to a solid.  It slices as intended in PrusaSlicer.

Posted : 13/08/2020 4:14 am
jwvaughn
(@jwvaughn)
Estimable Member

The first time I sliced it the holes were filled in.  I did a repair through Netfabb even though there were no errors indicated and it sliced correctly. I can only guess as to what the problem is so hopefully someone with more knowledge than I can fill in the blanks.

Jerry

Posted : 13/08/2020 7:29 am
jsw
 jsw
(@jsw)
Noble Member

Try this one.  See attached file.

The original .stl is most definitely corrupt, as it will not convert to a solid in FreeCad.  I used a trick of converting the mesh to a shape and re-exporting it.  The resulting file will convert to a solid.  It slices as intended in PrusaSlicer.

Posted : 13/08/2020 8:13 am
Neophyl
(@neophyl)
Famed Member

According to the 3dprint tool in Blender the model has, 16 Intersecting faces, 8 zero faces and 4 zero edges.  Fixing the zero edges and faces allows it to slice properly.

Posted : 13/08/2020 9:10 am
dan007
(@dan007)
New Member

Thanks a lot for all your help. Very much appreciated.

 

Posted : 13/08/2020 2:05 pm
jwvaughn
(@jwvaughn)
Estimable Member

Out of curiosity, what application did you use to create the object?

 

Posted : 13/08/2020 4:34 pm
dan007
(@dan007)
New Member

@jerry-v2

Openscad (version 2019.05, on Mac).

So there is a bug in the rendering engine (CGAL).

Posted : 13/08/2020 5:19 pm
Neophyl
(@neophyl)
Famed Member

Should have known.  More than half of the 'slicer is doing x' on my model posts we get are down to openscad.  Its incredibly powerful if you are of the programming nature but unless you know exactly what you are doing it seems to have these issues.  

I suspect its down to the vertices precision and with them not being quite aligned.  Cura seems to collapse them into each other and so can slice them ok but Slic3r, Prusa Slicer etc dont (as yet) so you have to use the fix through netfabb route or other option.  

Posted : 13/08/2020 5:49 pm
dan007 liked
jsw
 jsw
(@jsw)
Noble Member
Posted by: @neophyl

I suspect its down to the vertices precision and with them not being quite aligned.  Cura seems to collapse them into each other and so can slice them ok but Slic3r, Prusa Slicer etc dont (as yet) so you have to use the fix through netfabb route or other option.  

I did not think of trying Cura on that one.  I have, however, found that Cura seems to be more forgiving, and when something does not slice properly in Prusaslicer, I'll try Cura and often, but not always, it will.

Posted : 13/08/2020 7:14 pm
dan007
(@dan007)
New Member

@neophyl

>I suspect its down to the vertices precision and with them not being quite aligned. 

I think you're right!

Model slices ok when $fn is brought to 10 (was 100 initially) without any other code changes.

Circular shapes are less than perfect 🙂 but at least, it prints.

Posted : 13/08/2020 11:25 pm
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