That this model pushes the limits of angles that are possible to print, at the base of the model. No supports needed. The model is fairly clean and should have no problems on any slicing software. 

I would recommend not printing at a scale lower than 54% unless you are using a nozzle smaller than 0.4mm.

Rafts: None
Supports: None
Infill:  6%

Notes:

Print with skirt build plate adhesion, no supports. If you have more than 2 walls in your slicer enabled it will come out mostly solid due to the geometry. User Specified seam with smart hiding enabled.