If you have a window near where you have your 3d printer I would recommend just putting a hole in a plywood board and running a tube from your printer to the hole in the board and just mount the board to the window by opening the window and then closing it on the board, this way you dont have to modify any door (doors are more expensive and a pain to work with) if you want better airflow I recommend a 3 inch tube and an inline fan.