Ender 3 - noctua fan stepdown case

I've changed most of fans in my Ender3 s1 to noctua. Since they need a stepdown I've designed this case mounted on a 3printer.

Rails are a bit of a thight fit, but at least they don't move when you carry your printer.

To mount the board to the case ive used m2*5*3.2 mm threded inserts and screws.