The initial batch of Duplicator I3 units could use some extra air intake on the controller. There are air vent holes but no intake holes (at least on my unit). This is a replacement back plate that can be laser cut out of wood or plexiglass or 3d printed. There are two openings that can be left open to allow for air intake or you can install one or two 40mm fans to suck air in to help circulate the air over the power supply and board. The power supply does have a fan that pulls air in but there still needed to be a source for the air.

Laser cut or print. The laser cut parts should have the enclosure holes counter sunk so the original screws can be used. If the part was laser cut in plexiglass then carefully use a larger drill bit with the drill in reverse to make the counter sinks.

Remove the wiring from the power outlet to the power supply (note where the wires go) and then mount the power socket on the new back plate. Install any 40mm 12VDC fans with the air flowing in towards the controller and connect the fan power to the unused V+ and COM terminals on the DC power supply.

Reinstall on the back using the original screws.