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Ultimaker2 fails shell of object: parts of shell missing

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I think the problem described in the title is caused by Cura because the missing shell is also in the layers view.

I try to print a tube but on both sides of the tube the walls are failing and the shell is too thin. I use 3mm shell thickness, 210°C, Cura 14.09, 50mm/sec printing speed.

Who of you might know what could be my problem?

Thank You


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the shell thickness I set is 3mm with a nozzle size of 0.4mm. I think that couldn't be the problem.

Could there be the problem that there is "a layer too much" in the object? Imagine I want to print a cube with another smaller cube on it. And there are two layers touching each other. Of course one of them is too much. Does Cura have a problem with this?


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