after you finish the step 12 or 14, you can extract the curves from solid body.just follow the step as below: 4 k+ o& I3 G; ~+ f d7 V1: make new layer for new curve. 3 x _5 N& M1 K2: under modeling, choose Insert--Curve from Bodies---Extract---Edge Curves---All in Face, then select the face of solid bo dy,---ok---0k---Cancel, leave the Extract curve dialoge. $ T% e$ V) d5 A |3. make the solid layer invisible but the new layer of new curve selectable or work. g$ O" q, S; t5 w
4. that's all.