after you finish the step 12 or 14, you can extract the curves from solid body.just follow the step as below:, X# g- ] M) {) f4 u
1: make new layer for new curve.+ K8 X0 }8 R5 e
2: 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.' N: ]* o# i4 k7 G Q
3. make the solid layer invisible but the new layer of new curve selectable or work. - Z: d3 V2 Y* h" W5 [/ }3 ]4. that's all.