after you finish the step 12 or 14, you can extract the curves from solid body.just follow the step as below: % u: q, K, v" n* U1: make new layer for new curve. 5 a' h. M2 v& d0 S; H6 i! d2: 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. 5 x# {( Q! E9 k" |3. make the solid layer invisible but the new layer of new curve selectable or work.( X- Z5 `6 u2 _
4. that's all.