Dual 40mm fan bracket for Promega Duet Maestro

Very simple fan bracket to hold two 40x40mm fans. The bottom of the fans sits flush with the bottom of the bracket, the bracket is secured with a single screw in the center. Depth of the fans is not fixed, I used 20mm fans for increased static pressure but 10mm fans would also work. The application is to add cooling fans for the Duet 2 Maestro board to the M3D Promega 3D printer with no modifications required. There are already holes in the case below the Maestro board, and if you use 5V fans the Expansion header on the Maestro board has two sets of GND+5V where the fan headers can plug into (note that you need to have or make a two-pin fan header).

Very brute force, but low effort and high return. For increased efficiency it is useful to put heat sinks on the motor driver chips (which generate all the heat). The Duet 2 Maestro is designed to draw heat out of the bottom of the board, this bracket is designed to force air under the board as well, as the fans actually sit flush with the case. Also important (but not essential..., but important) is that if you use the back panel on the Promega it has no vents. It would be useful to cut some venting on the bottom of the case below the fans for fresh air.