This is the easiest way to thumbscrew yourself an active cooling solution for your CNC system. It's uses are as endless as its possible configurations regarding how many fans you need to use.
This set can support as many 60mm fans as required, and considering my 48v Sanyo puts out 60CFM by itself adding multiple units will easily cool any system.

The standofs are adjustable to support all height mounting requirements. This is a thumbscrew design, with simple terminal block mount for power. Simply unscrew two thumbscrews, and two screws for the terminal block, and its out!

CNC Stepper Driver Active Cooling System 12V Toolless Removal | eBay