Voron 2.4 rear bedfans

Installing the bedfans in the rear of the printer makes the air circulate more in a circle when combined with a nevermore micro.

Combining two rear bed fans at 20% speed and a nevermore 0.5 at 60% speeds, I reach 30C chamber temps before the bed even reaches 100C.

NOTE this is sized for a V2.4 350mm. If you need a different length arm let me know and I'll upload that.