Hi, my name is Johan Link and I'm 16 years old. I designed this object with Fusion 360, I made a mechanical object, but it does not require any assembly. It is this type of object that I love to create with 3D printers. 3D printers can make mechanical systems without assemblies. I love this. If you want to modify this design you can download the Fusion file with this link: http://a360.co/2s2ARYk HOW TO USE IT: Click here to see the video HOW TO ASSEMBLE IT: There is just one thing to do to use this spinning top. You must have a ball of 12mm of diameter. Clip this ball in the bottom of the spinning top. I print this with the K8200 printer, and I use Cura to generate the G-code. My Print settings: Bottom/Top thickness 0.6mm Fill Density 20% Platform adhesion type: none Support type: none PLA HOW IT WORKS: It's really simple, when you extract the stick, the stick rotates a gear and turns the spinning top. I speak French, excuse me for the mistakes of English. If you have any questions do not hesitate to write a comment:)