Extrude along curve problem

Hi guys!

I’m new to Rhino… I am trying to create a bottleneck thread using a square closed curve to a helix. My problem is the square is rotating… I’ll try to post a pic to explain it properly. I also tried to sweep with 1 rail but no success. Hope you can help me with this… Thanks

Hi Charles- Use Sweep1 for this, Extrude does not reorient the profile curve as you need here. Sweep1 also accepts multiple profile, or shape curves.along the path.


Problem solved! Thanks for your help Pascal!