Add extra wall to the outside only of hollow circles?

[creizlein 0]

Would it be possible to add an extra wall to a model but ONLY on the outside perimeter.

Its a tricky question because in this case, its a hollow figure, so Cura adds it to both the inner and the outer, because both are outer?

I have attached a dummy screenshot with a hand-line in blue of what I intend to do if that makes any sense

[GregValiant 1,330]

Maybe.  You would need to fool Cura.

Let's say your line width is 0.4.

You could try setting the "Horizontal Expansion" to a single line width (0.4) and then set the "Hole Horizontal Expansion" to double line width (0.8).  "Hole Horizontal Expansion" generally works by the radius but in your case you would want to increase the overall "diameter".  It might work although you have that random sort of shape.

 

The best thing to do would be to alter the model in CAD.  Cura is much better when the model is what you actually want rather than being "Somewhat close except for....". Cura's a fine slicer but not much of a CAD program.