Hover balloon ( you need a rubber balloon )

It's fun hover balloon.
You need a rubber balloon to run.
Print it and blow a balloon, put the balloon on it.
Then watch the balloon moving around ;D

When you print it, please check bottom holes were made.
They are 2mm on file, but actually, were printed as less than 1mm.
That's suitable size, but some cases, the holes could be filled completely.