Quote Originally Posted by Jonathan View Post
If the system is closed loop, then without a reasonably large tank you will certainly need a radiator of some sort. The easiest option is just to use the parts people use for computer water cooling systems, but the parts for that market tend to be overpriced so unless you can get lucky on eBay I'd substitute them for cheaper options, e.g. the pump you found and a car radiator with a fan for the heat exchanger. I don't think you'll get away without a fan unless you have an unreasonably large heatsink.

It's been done before:
Spindle Water Cooling System Test Start - YouTube

That system looks nice and light.
The pump in that youtube video looks like the same item I linked to in my first post (which is quite cheap) ...

DC12V SC-300 Silent 23DB Water Cooling Circulation Pump For Spindle Motor Router | eBay


just where to buy the radiator with integral fan, I found a radiator that seems well priced (so might just lob a quiet fan onto it)....

Aluminum Water Cooling Block Water cooled Row Heat exchanger For PC Computer 90 | eBay


I'm ideally seeking a solution that can be mouted on the rear of the gantry of a 3020 machine (fixed gantry type)