after you finish the step 12 or 14, you can extract the curves from solid body.just follow the step as below: / r5 u# k+ V* |. t, ?1: make new layer for new curve. , a/ [% M7 Z/ }( I; U2: 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.7 D* z/ w+ v* c6 R
3. make the solid layer invisible but the new layer of new curve selectable or work.5 L$ v8 Y- j( Q3 D
4. that's all.