This is quite a simple one, make a 400 x 320 x 120 mm coolant tank from acrylic and a generic aquarium pump, maybe 25 quids worth of acrylic and very simple machining, could even be done manually with no issues, 3mm end mill is all you need.

As usual, all primitives in dxf and an html to explain what's what.

This one contains an extra warning at the end of the docs, electrictricity + water + machine tools = rust  and / or electrocution.

njoy