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Top of Object Red in Object View

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Hello, so I designed a spinner in blender and exported it, and when viewing it in cura the top of the object is red, and I was curious as to if this should be cause for alarm before sending it to my schools 3d printer.  

I have made a few other spinners the same way in blender and they didn't have the red top.

Solid View

Any incite would be helpful.  Thanks!

Edited by Guest

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The modeler you used uses a different "winding order" for normals. So the part of Cura that visualises overhang actually thinks your model is inside-out, which makes causes overhang to be shown on top surfaces instead of bottom surfaces.

http://cmichel.io/understanding-front-faces-winding-order-and-normals/

CuraEngine (the part of Cura that does the slicing) does not use the normals of the geometry, so it is no problem for printing.

Edited by Guest
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