Perimeter curves only on half of the structure

[Ferd]

Hi,
I am trying to get the perimeter curves (4 lines along the corners) of a square tube. I have used Surface.Perimetercurves, but I only get lines on two of the corners, as you can see on the picture of the structure. Does anyone know how I can get lines along all four corners?

[sovitek]

Hello @Ferd and welcome to the forum…something here maybe

and for overlapping curves

and another option

[Ferd]

That worked, thank you!