You know those little whistles for kids, when you blow thru them, they spin up like a turbine? This is that, but a jumbo jet whistle. Was a study in tolerances of the Prusa, to check threads, bearing tolerances/fits, etc. Makes fun sounds and worked great until we fed it 130psi from the air compressor.
We were trying to make it explode, but all it did was a bit of melting…