Ramps 1.3 Cooling Fan mount for "Power Supply Bracket for Kossel 2020"

This is useful cooling of Stepping Motor Drive.
Especially SilentStepStick movement becomes worse when high temperature.
Power Supply Bracket for Kossel 2020 is dedicated.
http://www.thingiverse.com/thing:758141

Mounting:
Cap Screw M3x12mm + SW + Washer ...2 sets.
Cap Screw M4x15mm + SW + Washer ...2 set.
Fan 50mm x 50mm x 11.5mm ...1 unit.

Parts involved in this:
Ramps 1.4 Holder for Kossel 2020 near Power Supply
http://www.thingiverse.com/thing:761865

July 30 2016,
I added fa