Summary

This may be a base for my further design, such as Text gyro:

How I Designed This

There are two main styles of gyro on Thingiverse. One is using a top and a hole to compose a axis, such as the following:

The other is using no axis, such as my Maze gyro:

Maz gyro

The thing here is using two tops and one round gutter between rings. While rotating, It has more free degrees than the first style, but fewer than the second one. The advantage it has, however, is that each ring may be thinner than the second style.

Yet another gyro