FIRST POST so please go easy on me.

I'm trying to print a "ball" where the top and bottom have been removed so they are flat. The bottom half of the ball looks horrible but the top half looks awesome. Not only is the bottom half not "curved" appropriately it is also bubbly. It looks like over extrusion and possibly an unlevel bed but after a few trials, it doesn't get any better. It looks like it gets better exactly in the middle where overhang changes direction.

Printer: Qidi Tech
Slicer: Simplify 3D 4.x
Filament: ABS 1.75
Filament Temp: 240c
Bed Temp: 110c
Fan: Off
Supports: No
Print area is enclosed.

Design
FountainHead9Holes.jpg

Print
FountainHead9Holes.jpg

.stl file
FountainHead9Holes.stl

What do you think is causing the bottom half to look so bad?