nope no 12 volt outputs anywhere on the mightyboard. All 24. Check :-)

Assuming his machine is still using the standard mightyboard - then he'll need 24 volt fan.

And I found that the cooling fan massively improved all prints both abs and pla as soon as I fitted it.

Went from really dodgy underhangs to near perfect spheres. All bridging and curved surfaces started looking like they should.

Best add-on ever :-)