Summary

Very powerful, it does not need much water current.
I will make a wind turbine and a crank to be able to put also in the generator module.

Material you need:
1x 5mm steel bar or threaded bar. 50mm long
2x bearings 16mm outer diameter, 5mm inner diameter, 5mm thickness
2x 1mm wire or 1mm nail (Is used as a pin between the shaft and the large gear wheel)
1x AC 3 Phase Micro Brushless Generator 3-24V (4€ on ebay )
1x 5mm steel rope 120cm
The steel rope to the turbine and connector is attached with two-component epoxy adhesive.

is based on this turbine: www.youtube.com/watch?v=iNuZaaJZd3w&list=FLpbNG1kAJ3rVOZ7e8484KWQ&index=1&t=31s

Print Settings

Rafts: 

Yes

                                            <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>Yes</p></div>

Resolution: 

0.2mm

                                            <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>0%</p></div>

Notes: 
 

Turbine:
0% infill
wall thickness 0.8mm
top/bottom thickness 1mm
layer height 0.2mm
PLA
Print with the widest part upwards

Gears and conecctors:
100% infill
wall thickness 1mm
top/bottom thickness 1mm
layer height 0.25mm
PLA

Case:
20-25% infill
wall thickness 1mm
top/bottom thickness 1mm
layer height 0.25mm
PLA