Water cooling for E3D V6

inpired by: https://www.thingiverse.com/thing:3697905

Hotend water cooling.

Minimalist subtle solution enables assembly without the need to change the print head.
The heatsink was glued using a two-component glue. The entire print was also coated with glue from all sides.

I recommend doing a pressure test below the water level with a compressor or bicycle hand pump.