FOR TILTED ADAPTER, WHICH IS BETTER CHECK THIS THING OUT:
I've found NOCTUA 40x40mm FAN to be GREAT replacement for the original noisy one. Noctua is really whisper quiet, but may look a bit odd with all the brown colours...
So this is a full Noctua 40mm fan cover, which goes over the fan. It also allows fans original anti-vibration pads to work to their full extend. It goes along with this adapter for Noctua fan:
I printed it with 0.2mm layer, but it's up to you... it's not that relevant. It's quick and easy print.
PS: I'd go with 2 colours split at 1mm. First color is the printer color (orange) and the second one black. Who will be the first one to make it? :)
Noctua FAN: http://noctua.at/en/nf-a4x10-flx