Is this from sketchup? If so here is some advice. Mostly just follow the advice about inside versus outside surfaces (right click in sketchup and swap):
https://i.materialise.com/blog/3d-printing-with-sketchup/
If it's not sketchup or if you didn't create the model, maybe try:
netfabb free repair service is here (you have to create a free acocunt first):
https://service.netfabb.com/login.php
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Smithy 1,141
We cannot predict what's the problem, so post more information and upload the Cura project file.
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