dang, ok, good to know. that was an intentional angle, not a mistake. I assumed moi would work with such a profile. It seems to extrude fine, but errors trying to cap it for the reason you mentioned. Thanks for the tip on the flat snap. The end goal is something like the blue components of this shoe. I keep trying to build one line curve at a time because I am measuring things with calipers and trying to be accurate. What seems to be the way I need to approach this is to use the lines simply as guides, then use solids and boolean the hell out of them because everytime I try to 'build" surface or solids from joined curves I keep running into workflow problems.