I'm not sure if this has been done before, but I decided to change the mobo cooling. The original fan is a 40x10mm fan running 24vdc, my guess is 8-10k rpm. That's less than 10cfm of airflow and roughly half is distributed over the stepper motor heatsinks.

I replaced it with a 80mm fan as 12vdc, it's powered by a mp1584en converted set to 10vdc (blue device). It could be adjusted from 1.5v to 23v when connected to the main PSU. I have a thin 80x15mm fan on order that will fit w/in the lower shield, but for now it's rigged with a ADDA 80x25mm fan pulled from a Lian Li case.

Airflow is increased significantly, but more importantly it's nearly silent!

http://imgur.com/a/nDlHs



I also flipped the power switch assembly so the cord doesn't block the switch from the side. I had to remove all the rear screws and roll holders but it was well worth it.