I wanted to create a vase of my own. I like the twisted vases but I wanted to make something special. So I came up with the idea to make a double twisted vase. There are two the same parts, both twisted 90 degrees. The one twisted left, the other right. Then the file was uploaded to Netfabb to get rid of all the faults. And because of this the inside turned out to be just as special as the outside!

Created by Toussaint Jongen
http://www.thingiverse.com/Arteron
Shapeways
http://www.shapeways.com/model/1473137/double-twisted-vase.html?li=search-results&materialId=6

Printed with the Ultimaker. Thickness is 2 layers. Bottom thickness is 1 mm.