Ender 3 PSU fan cover
thingiverse
My version of the Ender 3 Power supply (PSU) fan cover. The main reason behind this design was to reduce the fan noise - which it does do! It also directs airflow towards the back. I have had no issues with overheating. Best printed in the orientation as seen above. I would recommend blocking supports everywhere except for the little overhanging tang. This is for the base model Ender 3 PSU. I am not sure if it will fit the higher spec (Ender 3 pro?) PSU. I printed this in 0.2mm and with a brim. If you are confident in your bed adhesion, than a skirt will do just fine.
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