The main object of this is not my my work all I have done is create venting slots for the switch and for the board.
All credit needs to go to Elroy as he is the person that made the base design.
The reason why I have made this is that there was a comment on the main item which said that there is no venting holes and the person did not know how to add them through the software and was not confident in using a dremal on it (I wouldn't blame them as so much melted plastic has ruined many of my peices).
So in light of the comment I have edited part D of the main item listing and added 14 slots on the back and 2 just behind the switch in the theory that the fans on the switch will suck in cool air and the warm air from the board and exhaust it out of the top while it is doing it's normal operations.
I have not had chance to print this and try it yet but by just looking at it I am pretty sure that it is going to work out fine