3D Spin Top

The best spin tops have a tip made of a very hard material in order to minimize friction between the top and the spin surface. This design requires a steel ball to be glued into the bottom of the print. One design uses 1/4 inch stainless steel ball bearings and the other 3/8 inch (Amazon has them). By using these and a concave glass lens or mirror surface, you can get spin times over 6 minutes.
Here's a short video showing the top in action: https://www.youtube.com/watch?v=lySgPi_sKsk
Print Settings
Printer Brand:
MakerBot

Printer:
MakerBot Replicator 2

Rafts:
No

Supports:
No

Resolution:
0.2 inch

Infill:
100% (see note below)

Notes:
I used "bottom solid layers" for the entire print. This gave me 100% infill but without using the infill design, which jammed my printer. Find the setting and make it 100 bottom solid layers.
Post-Printing
Add the Steel Ball
Clean up the print and then use super glue to hold the ball bearing in place.
How I Designed This
Fusion 360 and Simplify3D
Using Fusion 360, I designed the cross section in 2D and then rotated it about the vertical axis using the Revolve command. I exported the STL file and then prepared it for printing with Simplify3D.