Does anybody see why my edge ring is only on the outside of the object, but not on the inside when I use the "Loop Cut and Slide"?
The red arrow points to where I expected the "inner" edge ring to appear.
Thank you.
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$\begingroup$ the mouse cursor was at the red arrow ? $\endgroup$ – Chebhou May 5 '15 at 0:03
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$\begingroup$ Are you trying to display the line that is on the outside, or are you trying to add it to the inside? $\endgroup$ – VRM May 5 '15 at 0:12
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$\begingroup$ On the inside. For some "Loop Cut and Slide" it worked fine, then it stopped. I must have done something that made it stop worked correctly. $\endgroup$ – MaikenRosk May 5 '15 at 0:18
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An inner ring never appears when you do this. You can alternatively use a solidify modifier, or you can follows these easy steps.
Add the edge loop on the outside.
Enable vertex snapping Shift + Tab. 
Add the loop on the inside, then G > Z and mouse over the outer loop.
Adding screenshots...
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An inner ring never appears when you do this.I don't quite follow that . . . $\endgroup$ – VRM May 5 '15 at 0:10 -
2$\begingroup$ You never get two rings (outer and inner) when you loop cut. I think he was confused with the functions of the loop cut. $\endgroup$ – Scalia May 5 '15 at 0:11
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$\begingroup$ Well, usually I DO get an inner and an outer ring. I will record a video tomorrow that demonstrates this. $\endgroup$ – MaikenRosk May 5 '15 at 0:19
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2$\begingroup$ that's super weird, it should only happen when there is an unbroken polygon to be drawn. $\endgroup$ – Scalia May 5 '15 at 0:20
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By hovering over the inner edges, you should be able to do this. Make sure you are not near enough to the top of the mesh to cause issues of course.
If this did not work, try looking for missing faces, non-uniform geometry, duplicate vertices, or N-Gons (5+ vertex faces).
