MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
In vase mode you get a double thickness layer but you won't get the same detail that you get doing a 0.4mm width so doing the light saber 'blade' it is fine as it is made from tapered cylinders. I did one today using 0.8mm width in vase mode so I'll try and post my make tomorrow.
It's a bit off topic but one thing I did notice from using it with vase mode (for actual vases) is that when I did the bottom layers at 0.8mm thickness they were not water tight and leaked a bit so I use 0.4mm for the bottom if I do want them water tight but if I don't then I just leave them at 0.8mm.