The stock ventilation layout is random. To improve upon it you can remove ventilation grids or cut larger openings. Install these gadgets to improve overall airflow for the electronics.
All designed to be printed without support - overhangs less 45 degrees, sacrificial layers included; may require rotation on printbed.
Further improvement should be possible with filling the gaps between sidepanels and metallic frame to hinder warm air penetrating to electronics compartment in uncontrolled fashion. Lookup the work of MARC PRUDHOMME here https://www.printables.com/@MARCPRUDHOMM_1986375/models
extended: two exhaust fans to push warm air out. I currently have activated only the smaller one with 60x60 fan. Powered in parallel with mainboard fans.
The author marked this model as their own original creation.