Hi Rudl,

>>why my origin network didn´t function.
I think Michael can explain that better.

>> opened shelled box.
I guess you mean offsetsurf.
Offset works on curves,surfaces and polysurfaces(well in most cases!)

Example: draw a box(polysurf),select the topsurface and then delete it.
Click Offset and insert a distance less than the overall size of the shape.