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Cura inverted raised perimeter

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I modeled up a print using onshape.   the print is a  profile of a car with the outer edge being extruded up 1mm tall and having a thickness of .8mm.   When i bring the model into Cura and look at it in solid mode the model looks like it did in CAD.   when i slice the file it inverts so the recessed center area is now 1mm tall and there is a step on the outer edge that is the inverse of the raised perimeter.   I dont have the print handy but I will update with pictures of the print when I get home tonight 


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Look at the part in cura "xray" view mode.  If anything is red than it's a problem and you need to fix your model to make it manifold.  netfabb has a free service for this: https://service.netfabb.com/login.php


Also normally if your nozzle is about 0.4mm then cura wont' slice anything at 0.8mm or thinner so experiment by setting line width a bit smaller to see if that helps your issue.  Also you could try the "print thin walls" option in cura.


If none of that helps then we need to see what your model looks like in slice view because I didn't understand the "recessed" description.

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