A turbine that I've created

Parts that aren't 3D printed (Base turbine, no gear train)
2 608 skateboard bearings
2 - 4 m3 screws, any length longer than 35 - 40mm should work. It just needs to hold the two halves together.
8 studs long ‘brick’ axle for the rotor

Extra stuff for the gear train:
2 extra bearings (4 608 skateboard bearings in total)
11 studs long ‘brick’ axle is what you need for the big gear (If you print it)
The pulley is only needed if you want to lift something, but feel free to design your own.
Some thin rope for the pulley, yarn is what I've used

Youtube Tutorial
https://www.youtube.com/watch?v=ww3gTWxVgqM

I reccomend that you tune your printer's "hole horizontal expansion" setting before you print these, or the parts might not fit.

YOU DON'T NEED TO PRINT "casing top (with gear holder)" AND
"casing top", ONLY ONE

215c nozzle
50c bed
ender 3 v3 se 
hole horizontal expansion 0.2 cura
I recommend printing the small parts first, checking if they fit, then printing a larger part.