About this 3D model

http://www.youtube.com/watch?v=mYpmUUqbb74&feature=youtu.be This top uses a metal 1/4 inch ball bearing as the tip. You can probably use a 6 mm ball bearing for this top as well. The ball bearing provides an extremely low friction tip for the top, allowing the top to spin for a long time. Just place the top onto the ball bearing and give it a spin. The above video shows the top spinning for almost 1 1/2 minute. I modeled the top in SolidWorks and printed it on a Replicator 2 with 100% infill.