The title is pretty descriptive :)
Printing the vertex of the top flat makes it easy to get a nice finish!
No support required :)
Download, print, spin.
Important note: Keep the perimeter speed low in order to get a nice finish for the overhangs.
Print settings for Cura: 0.5mm nozzle, Wall Thickness: 1.5mm, Layer Height: 0.4mm, 50% infill, 12mm/s (perimeters), 60mm/s (infill).
These speed settings are achieved by choosing a Print Speed of 60mm/s and setting to 20% the inner/outer wall speed on the printing interface.
Thank you Obijuan for fixing it!! :-)