I highly recommend printing the auger with tree supports and brim. I get curling on the edges of the overhangs, so any tips to reduce that would be appreciated. The underside of the blades turn out pretty rough with the level of the overhang, but it doesn't affect the usefulness. I tried printing the auger in many orientations, but standing up creates the best result. 

The shell doesn't require supports, but recommend normal if you don't want any stringing on the inside. The prints never failed on my X1C, but the inside overhang did produce some stringing.

Enjoy!