Customizable Spiral Tree
by walter, published
Decorative spiral tree.
For hanging spirals, check out http://www.thingiverse.com/thing:59270
Smaller spirals, depending on the print parameters, they may need to be stretched to generate the bell shape. It helps to do this when they're warm (like right off the heated print platform).
Complex spirals may take a long time to render to a STL file.