Make bubbles in the wind : weathervane

Hello,
Here is a weather vane that uses the wind to blow bubbles .
I modeled more propellers to get into most printers .
All parts are very easy to print and assemble with M4 bolts and a small threaded rod M4 .
For the axis that supports the weathervane , I use a stainless steel tube of 10 mm diameter .
With the two gears , the wheel that makes the bubbles turns 3 times slower than the propeller .
I use epoxy glue to fix the rings together to make the rudder.
You just have to put s