looking at your file, everything is there you need to build a good nurbs surface on top of the stl
all I did was selecting some of the pink curves that are coincident with the stl, closed them(they had little gaps!), rebuild them with degree 3 (polylines before) and created a network surface… looks pretty coincident with the STL original.
What I sent, is just an example of what I need.
Imagine I don’t have these curves that are between the base and the top.
I need to get it correctly as in the example.
And yes, these example curves are good, the result of manual work.
I need to find a way to build the curves like the example, parametrically.
This is a great solution! Could you share how you determine the number of degrees of the NURBS curve to use, for approximating each polyline curve? (e.g. simple curves with very few turns can be approximated with low number of control points, whereas curves with high number of turns need more.