Open Fan Mount for Rambo V1.3 Board

I am working on the Mostly Printed CNC by Allted (https://www.thingiverse.com/thing:724999)

I was worried about the RAMBo board getting hot so I threw together a open fan assembly that hugs the board. I wired the 12V fan directly to the power supply of the board (bridging off the power connector) instead of using the fan power supply on the board.

Parts:
4 x M4-.7 Nylon Nuts
4 x M4-.7 x 30 Pan head
1 x 50mm Fan

Thank you to Savorywatt for the RAMBo board CAD model
(https://www.thin