Hey Michael. It's me again. (Heavy sigh)

I have a somewhat complicted curve that I want to extrude into a solid. I've tried to make sure the curve is a single entity, including doing a rebuild on it. When I click on it, it says that it is a single curve. Yet, when I try to extrude into a flat, thin solid, it won't cap the ends. I'm sorry that I keep having trouble with these basic operations, but I do. I also don't seem to be able to detect what the problems on my own. Please look at it.
Thanks,
Mark

Your curves are not clean!
Overlapsed and not well connected at some extremities!

Hi Mark - so it looks like the problem is that your curve is open and not a closed curve.

Note that when you select a closed curve, the type will actually read as "Closed crv" like shown here with a circle selected:



Since when your curve is selected it just says plain "Curve" as the type, that means it is an open curve, so there is a little space somewhere in it between the start of the first segment and the end of the last segment.

There is a plug-in you can install called "MarkOpenCurveStart" which will let you set up a keyboard shortcut that will create a point object at the start location of a curve - that can help you figure out which area to zoom in on to see where the opening is at. I guess Pilou is showing there that instead of a gap in that spot it's more like the sides cross over each other at that spot.

You can get MarkOpenCurveStart from here:
http://moi3d.com/forum/messages.php?webtag=MOI&msg=2888.11

- Michael

It's here the problem ;)
Make zoom / show point and you will see that curve is not closed

Hi Mark, just to help clarify a couple more screenshots:






If you can get that area cleaned up so that it is a completely closed curve then it should extrude as a solid with end caps on it.

- Michael