"Enclosures" are for chickens and cows. This is a cage I designed to hold the unwieldy savage that is my Arduino/RAMPS electronics.
It attaches to the side of the Prusa i2 frame and has a mounting place for a 80mm fan inside to keep RAMPS cool. If I don't keep a fan on my stepper motor drivers, I find that they skip and become ornery. The frame is open enough to allow lots of airflow but still keep everything tucked inside. The side where USB and power connect is completely open. Mouseholes in the bottom of the base allow for some wiring access options.