This is a remix of the lid to fit the Ender 3 control box for MKS Gen_L by madizmo (https://www.thingiverse.com/thing:3388108) which has the stepper drivers on the opposite side.
I relocated the fan and ducting to accommodate the drivers being in a different place. If you are using the TMC2208 drivers, I recommend bending the header pins 90 deg. This prevents the ducting from interfering with the wires and keeps the duct clear for max air flow.
I have included logoed and plain versions of the STL files.
P.S. pay attention to the pin order on the 5015 fan. The ones I ordered had the pins opposite to what the plug was on the MKS Gen-L. Positive lead should be closest to the mounting bolt.