Hardwiring E3D hotend fan to RUMBA 12V

Hi all -
I have a Mendel90 that I have upgraded with a RUMBA and E3D V6 hotend, and the fan that attaches to the hotend needs to be on all the time. The FAN0 and FAN1 connectors on the RUMBA are designed more for print cooling fans, and are not on all the time. Where on the RUMBA can I connect the 12V fan to have it running all the time?

(BTW, I might hook it directly to the supply, but my supply is 24V, so that is a no-go).

Thanks,
Rob

You could get a 24V fan. They aren't hard to find or expensive... A quick check on ebay finds several sellers selling them for $3-5.

The 24V fan would be the simplest, but a cheap LM2596 buck converter would easily and efficiently knock the voltage down with plenty to spare if you had anything else you wanted to run at 12V.

FYI,

Something like this:
cheap step-down converter