Unicorn Puzzle.skp (926.7 KB)
I have been working on this unicorn at the request of my great, grand niece. I made a rough model of what I wanted but did not like that it wasn’t symetric so I could not use the flip tool. Therefore, I decided to move it to the back along the green access and to break down the body into component parts. I successfully made the the back end and middle parts as solids by making a quarter of each component and then using the flip tool to complete. After erasing some internal faces, they became solid and symetric. The problem came with the front end. After I flipped the quarter of it, and checked to see if it was solid, it showed reversed faces. The faces are not reversed. There are not double faces stacked on top of each other, either. When I erased the end face, the reversed faces went away, but, of course, a hole was made. Fixing the face again causes the reversed faces error again. Using the Dave Method and trying again did not solve it either. Any help would be appreciated.
You have some places where there are multiple faces overlapping. One area is just above and to the left of the cursor.
Select faces one at a time and delete them. Redraw edges if you get holes. I would do this from the inside as it’s easier to see what’s going on.
Note the different shading on the one face here.
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Here’s the fixed up object.
Unicorn Puzzle.skp (919.1 KB)
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I should have kept trying more of the faces. I only erased three or four of the wrong ones. Thanks for the screenshots and the fixed unicorn. 
Another way to use entity information that I had not noticed makes it easier to find overlaid faces by selecting a face area is in the screenshot
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