Mini 6 layers gyroscopic key ring

I enjoy the great design of Gianfranco
http://www.thingiverse.com/thing:1225044
but want to have a mini version to relieve my pocket load.

Tried to print the original design in 80%, but layers fused together.
So I remix this mini version in 3.6 cm x 1.2 cm (0.6mm gap)

In addition, the 3mm hole on one side and center 5mm hexagonal socket will give you a hand to separate layers.

Also provide .stp file , in case you would like to make some change.