Designed some covers for the ratrig v-core 400. I didn't like leaving it open on the back, but wanted to still have some airflow through it. I had some extra computer case fans, and so I incorporated them into the covers. There is one fan on the back cover and one on each side for a total of 3. I've found that having one of the side fans facing outward helps with airflow. I've uploaded the Fusion 360 files as well as dxf and stl files. Feel free to modify them to your needs.

You will probably have to add the following to the config file if you're using klipper/ratos.

[controller_fan my_controller_fan2]
pin: PD13
fan_speed: 1.0
stepper: stepper_z1, stepper_z2, stepper_z
idle_timeout: 60

[controller_fan my_controller_fan3]
pin: PD14
fan_speed: 1.0
stepper: stepper_z1, stepper_z2, stepper_z
idle_timeout: 60