This 3D printed water pump is working with two engines and has a gearbox with a gear ratio of 1:1,5. This water pump is capable of pumping 410l water per hour.

The body is printed with PLA but gears and turbine are made of ABS. I am sure that PLA works also totally fine, but I am a big fan of printing gear whit ABS.

Water pump and gears STL: https://www.thingiverse.com/thing:420...
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