[Component Wall from Surface]

On 9/28/2021 at 8:15 PM, Tom W. said:

thank you I did try 'Rebuild NURBS' but it didn't work:

 

But no worries, I've realised there are other limitations in using Extract Surface to generate the Surfaces in the particular project I'm using this in so drawing them from scratch is probably better all round

Try extract the edges then loft the edges to create a new nurbs surface.