I found my printer was overheating when printing with ABS (no enclosure). I pulled the bottom cover to discover the cooling fans are offset from their respective intake grills (~5mm for the control board fan and ~10mm for the power supply). This print is to close the gaps and pull cooler, external air. I printed mine in PETG for a bit more heat resistance and used hot glue to attach the duct to the power supply.
Another improvement to consider is to open up the intake grills a bit and add an exhaust opening.
The author marked this model as their own original creation.