[Cura Errors]

I just tried a print and this happened before abort:

 

It's a reverse of the actual design.

Do I have to add the support myself or do the settings in preferences  take care of it?

I do have Generate Support checked. What else would I need? There are so many settings that say Support... and I have no idea what most of them do.

Just found Drop Down Support Mesh - that looks promising...

 

I appreciate the time and info. Thanks again.

 

[Cura Errors]

So THAT's what that color means! Thanks! The color looks good in Cura now. Let's see if the top and bottom print correctly this time.

 

[Cura Errors]

22 hours ago, johnse said:

The bottom needs support...but that is supplied by the build plate.

 

the 3D design is represented by a mesh of infinitely thin triangles that describe the surface of object. If you zoom into the mesh of the sphere, you will get to a point where rect triangle is a flat surface, or “face”. Associated with that triangle is a “normal” vector that is perpendicular to the face. But does that normal point outward or inward? Properly described (by convention) the normals point outward.

 

Cura uses the normals for its display (the slicer doesn’t care and uses a different mechanism). If the face normals point downward by a steep angle, it colors red as a hint. If the sphere normals point inward, the ones on the top faces are pointing down...thus why Cura colors it red.

So I can ignore a red bottom.

 

I still have no understanding as to

1) how the normals came to be pointing inward

2) how to correct it

 

All I did was create the sphere in Sketchup.(and the box of course) and exported it into an STL. What do I do to prevent the normals from being reversed?

 

[Cura Errors]

Why does the bottom face need support?

 

What are "normals"? How did they get reversed?

 

I'm new to this stuff...

 

[Cura Errors]

Where do we find explanations for errors in Cura 4? And how to correct them? Including what the errors are/mean?

 

I created a box with a sphere inside and the bottom face and the top of the sphere are both red for some unexplained reason.

 

Thanks,

Walt