AutoCAD Inventor :: How To Make Template For Six Faceted Vase Form

I'm trying to make a template for a six-faceted vase form.  Basically one side of a sweeped hexagon along a curved path which I would like to Flatten in Sheet Metal.

First, I have a profile:

Then, I add a hexagonal base sketch:

Next I do a sweep using the profile as a guide rail and the y-axis as the axis:

So far so good.  Finally, I select one of the facets and Thicken to 1mm:

After converting to Sheet Metal and setting the Sheet Metal default to 1mm, Sheet Metal will not perform a Flatten because it cannot find any bends.

Is there any way to go about this in Inventor?  Perhaps using some other method than a Sweep?  Any method that produces a flat pattern