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Grey areas

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I've got several models from the internet (STL file), and when I place it in Cura 3.6 it is okay. I have to scale them down or up to be in the right size. When I slice it and I look in layer view, then I see grey areas in the model. So this area's won't be printed. How can I correct this, or is there a setting I should look at?



Edited by Humblebee

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This is the screenshot. The blue line is the real model, but as you see, there are grey areas that should be yellow (see the wings). 

How can I solve this problem.

I wish everyone a happy new year.



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These parts are too thin to print, for a circle, printed with a 0.4 nozzle, the diameter becomes 0.8. And they will not come out nice and strong if they would print this thin. Maybe add something solid to the model when printed, like a piece of filament, stick (wood, metal).

Edited by peggyb
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