I know, yet another spiral vase.
At 100% scale this vase has the following dimensions
100mm diameter at top and bottom
Approx. 200mm diameter at the center.
The shell version STL has a wall thickness of 1.5mm (at 100% scale)
The vase in the photos is printed in Lilac Pearl PLA from Diamondage.
It was printed with 2 perimeters at 80% scale and took about 5 hours to print.
The printed version in the photo was done at 80% and has 2 perimeters, 0.25mm layer height and took about 5 hours to print on my Delta-Pi Printer.
If using Slic3r then I recommend the following settings.
Layer height 0.25mm (for an 0.4mm nozzle)
Solid Layers Top=0 Bottom=4
Extra perimeters if needed:yes
Randomize starting points: No
Fill Density: 0
Brim Width: 1mm