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loops and perimeters inside out?

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I was having what I thought was a hardware problem, but now I think it's a misunderstanding of how the slicing works.

I tried to print a box with some holes pre-drilled in it, but got rough patches on the outside of the box (example image here -

http://i177.photobucket.com/albums/w228 ... 000010.jpg


looking at the gcode, I see the outside of the box is red, except where these weird marks are.. where it's green.

I think green is loop rather than perimeter? but why are the loops and perimeter getting turned inside out like this and how do I fix it?


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did you see the first picture of how it prints tho? where the green is on the outside the print becomes very rough - this was the reason behind my question the other day about loops -> perimeter -> infill vs perimeter -> loops -> infill.

I'm not sure the preview is wrong, I think something to do with the slicing is wrong (perhaps because it's confused by some aspect of the model?)

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