The BCN3D+ came with a blower fan which efficiently cool down the electronics, but it can be really noise up to 55 dB. So I change this set up for an option of 2 or 3 axial fans with run much quite, around 40 dB.
I have been using this set up with 2 fan pointing to the mosfet and the steeper motor driver and it works fine but for extra cooling you can add the third fan.

Material list:
1x 3D printed fan holder BCN3D
3x 12V 40x40x10 axial fan
2x DIN912 M3x10 (to hold the 3D printed part in the machine)
6x DIN912 M3x20 (to hold the fan in the 3D printed part)
6x DIN934 M3

You can buy this fan for example here -> http://www.ebay.es/itm/Ventilador-12V-Fan-40x40x10mm-FAN-CPU-enfriador-cooler-p-PC-ordenador-silencio-/251629967132?hash=item3a9650971c:g:NYYAAOSwEK9T~utU

RepRap

BCN3D+

No

No

0.3

30