This is a simple symmetric bracket that mounts on the RAMPS shield. No screws required to attach the bracket to the board. Fits 40 mm fan with bolt spacing 35 mm (1.4") outside to outside. Three improvements have been added. Nut trap on the inside, small skirt to channel air, and increased depth to not interfere the stepper wires,Use any RAMPS mounts (not enclosments) to mount your board to the fram. Then attach this simple device and wire your fan into D9. Use Gcode M106/107 to turn fan off and on.