In the last few days I have tested the assembled spear valve. Unfortunately I don't have any videos of it (yet).

However, the test was only partially successful.
The valve itself worked well and the water jet came out of the nozzle well focused.
Unfortunately, the connections between the individual elements were not waterproof.
That's why I'm currently testing a new connection method in which I swapped the ring seals for flat seals (printed from TPU). So far I haven't got around to test this seal. I will let you know as soon as I have any results here.

That being said, I assembled the turbine wheel. You can see a short video about ithe result here: