Helical Horror, a twisted torture test

3D-printer torture tests being all the rage, I decided to test overhanging features (35° angle from the horizontal) in combination with a tightly turning (35 mm diameter) torus on top.
A simple instruction to how I made it is included.

I think my Zortrax M200 did well, but there is a ripple effect visible on the underside that I don't know the cause of, and the bridging of the curve was (of course) impossible... ;)

Edit: the first STL file was incorrectly positioned, uploaded a new file