I have used the two circles and the offset command to create an elongated sin wave with a width of 2.5mm. It forms a loop and it looks closed. There are a lot of arcs after all the trimming, perhaps 40-50. I can extrude the edge of each arc, but not the face. The sketch shading has disappeared. There are a mix of black and black/white dots where the arcs join and the loop looks complete. I also press the broken black/red dots when they appear... How can I extrude a volume from this sketch is my question. I have used constraints as I went, but they didn't always stay in position.
Also is there an add function for the sketchs, like for groups? I could do with hiding some of them?
So far it's early days for me, starting to get used to the app,