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How do I fix this?

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Just tried to print one housing to a friend.

This is what I would like to get:


This is what I got:


How do I fix this? What causes this? How to avoid it in the future?

I am quite happy, though. I just got my very first decent ABS prints done.



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If you had looked at the part in xray view it would have shown errors in red. Any red is where you are looking through an odd number of planes which means there is either a hole in the part or an extra wall such that there is no inside and outside.

You probably could have fixed this with some combination of the 4 "fix horrible" checkboxes in expert settings.


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