Cura Slice bugging

[dennisboy18 0]

Hello After i slice my model i have this errors in my print. how do i fix this? i have screw thread and no online 3d model fixer is working. 

 

pleas help me

 

[gr5 2,172]

Did you create this model or did you download it?  I think it has errors.  What CAD do you use (I have different advice depenind on the CAD).

 

Cura has an amazing plugin to test your model to see if something is wrong with it and can repair a very few of the many potential problems:
In the upper right corner of Cura click "marketplace" and make sure you are on the "plugins" tab and install "Mesh Tools".  Then restart Cura.  Now right click on your model, choose "mesh tools" and first choose
"check mesh", then "fix model normals" and "fix simple holes" to see if that helps.  Cura doesn't fix most is

[dennisboy18 0]

@gr5 Hello, thanks for the tips but it is not working. i make the models my own with (Sketchup). and i remade a piece of this model and now are my screw threads not full round anymore (In Cura in my software and online software its round) See screenshot. do you now how to fix that?

[gr5 2,172]

In sketchup go back to your drawing and note that some walls are white and some are gray - right click on the gray walls and select "reverse faces".

 

More info (and other potential problems) here:

https://i.materialise.com/blog/3d-printing-with-sketchup/

[gr5 2,172]

Also did you try the plugin?  It just takes a minute to install and try out.  Less than a minute.

[dennisboy18 0]

@gr5 I fixed the with and the gray and also tryed the plugin but its still not round. see picture (Also picture from sketchup)

[gr5 2,172]

See red arrow in my photo - if any of those triangles have the normal backwards then it would do exactly as you show in the photo. Or if any of those triangles were missing (just a hole instead of a triangle).

 

The thing I hate about sketchup is that it even allows you to create holes in your walls of your solid.  This concept, "hole in the wall of a solid" doesn't make sense in the real world - only sketchup.  And most other CAD software won't even allow you to create such a thing as most CAD software is for creating real life things.  Sketchup lets you create infinitely thin fantasy things.

 

Sorry for the rant.

 

Try those plugins for sketchup I linked you to - they can check all the normals automatically and let you know if your part is manifold (has no holes in "walls") or not.

 

Again - i hope my concept is clear because in real life such a thing is not possible.  It's hard to describe something that I can't touch, see, photograph - something that only exists in certain CAD software like sketchup.

 

Also in Cura you can try xray view and if you see any tiny red triangles in that blue hole in the photo above then those are missing triangles.

 

So to clarify - the most likely issue is either a missing chunk of "wall" or a backwards "normal".

 

Normals tell the STL which in turn tell Cura - which side of every triangle faces solid and which side of every triangle faces air.

 

[gr5 2,172]

You could also upload your STL and sketchup model and someone nice here might look it over and find the exact issue.  Lots of people here do that all the time.