DoubleTwistLamp4

This lamp is similar in shape to https://www.thingiverse.com/thing:2508517 but uses different geometry to give it a more organic shape. This blog page describes the double twist method that creates the basic shape: http://birkbinnard.com/blog/do-the-twist/. Normally any STL file with overlapping shells will be difficult for slicers to slice properly, but this blog page tells how I was able to fix the overlapping shell problem with this (and other) STL files: http://birkbinnard.com/blog/problem-s