christmas ball tippe-top (working and easy to print)

It's time to hang decorations on the christmas tree, why not hanging a usefull ball: a tippe-top...
I wanted to design an easy to print, ready to play tippe-top; here it is:

• direct print the body, remove the included one layer bed
• print the spindle (octogonal, horizontaly printed one)
• trim the hole inside the body
• gently round the tip of the spindle
• plug it into the body
• gently sand the bottom on the body

run it !

If you want to see it tippe-toping, just click here :
http://youtu.be/8745TO5ELN4

Should you need some information on the simplified theory on how it works, just go here: http://www.fysikbasen.dk/English.php?page=Vis&id=79