Cura 15 on Win. I think this is an old problem even in previous versions.
Brim: Extra build plate adhesion on inside and outside base layer attached to the printed object.
It works as expected.
Skirt: Print a priming/adjustment layer ring outside of the object. Offset xx mm & number of loops.
That too works as expected, except if the offset is set to zero.
I would expect that to print a layer attached to the base as number of specified loops on the outside as a skirt with zero clearance. In effect it would work as an outside only brim which is what is needed for some applications.
Unfortunately it turns into a brim printing both inside and outside!
I am trying to print objects with a clean interior (vertical tube) and both brim and skirt will not allow that.
By the way, the expert skirt menu lists skirts as "Line Count".
Brim is listed as "Amount" It too ought to be "Line Count".
I know, picky, picky :-)
Bertho