While I had good luck printing the spiral goddess by sporegod, I ran into a few problems with some of my more specialty filaments (specifically the Sunlu PLA Marble).
The bottom of the original model is concave, so there are bridged areas not contacting the print bed, which are difficult at the size I was printing at. The marble PLA also has terrible adhesion issues, so I had to print with a raft because of the minimal bed contact. This wasn't ideal, and left the underside of the model with texture issues.
This version has a completely flat base for maximum adhesion to the print bed. It also has fewer triangles, to make it a bit easier on your slicer.