In this snowflake design, there is a hole in the middle for you to insert a ball bearing and play with it.
The specifications of the ball bearing are 22 mm in diameter (serial number 608), which is the most common of all.
If you don't want to buy a ball bearing, I've created 2 designs for you to add to the design with little pressure.
If you want more power, add a little WD-40 to the ball bearing, and it will spin forever.
You can use the ball bearing design for any other design you want FOR FREE