On the original M2, I've got a 40 mm 12v fan, and I thought those were supposed to be two 12v fans wired in series. (Have i got that wrong now? Did it change? Is that what caused the 24 volt fan to burn out?)
Reason I'm asking.....I have both a spare 24 volt fan, and a 12 volt fan, and I don't want to replace the 24 volt one with another one that is just going to burn out if it's supposed to be a 12 volt in there.
Figured I'd ask here first before contacting MG.

Many thanks!
Update: Okay I went through the Tech Support forum posts searching for crumbs, and I see that Tim says wiring the fans is series isn't a good idea, so i guess they've switched to 24 v parallel wiring. (And there's a 24 volt 50 mm fan on the extruder motors for the duals as well.)
Never mind!

(That 24 volt fan was super loud though....maybe it was just going bad. )