Blender animation

Here you can download a Blender 3D - file of a prototype wire model of a spinning 8 (Press "alt+a" to play / stop the animation):
http://www.pasteall.org/blend/3405
http://www.pasteall.org/blend/3463

Blender 3D is a free Open Source program that can be downloaded at: 

http://www.blender.org/download/get-25-alpha