@Grendel,

re:
> If you simply scaled in 3d would that not accomplish what you need?

Scale will give a result like this, here scaling a curve up by a factor of 1.5 :



Every segment in the original curve will be present in the scaled result with each segment being 1.5x the length of the original.

Arcs in the scaled result do not have the same center point as the original.

Offset result is like this:



Lines that are tangent to their neighbors will keep the same length, arcs maintain the same center points, the overall length of the curve can change quite a bit.

- Michael

Thanks again!
I thought "offset" created a shell as well, but it was just the original volume that I was seeing on the inside – my bad.

Have you tried the ScaleIndividual command ?

You can input a percentage

It works well on multiple parts also, scaling them each around their centre

cheers
shayne