Hello
If you want plugin I have a ribbon tool to do that in Nautilus plugin
Here an example of use and bug in r7
You need a good precision to remove some bugs
cut_geometry_with_curves.gh (7.4 KB)
And if you just want ribbon use Polyline Extrude Both Side of Mesh
make_ribbon_from_curves.gh (7.3 KB)
Or is is also quite simple to dot that with components
Divide the curve
Search notmal for each point
Move point up and down
With 4 points of a segment make a mesh face
Join the faces