This is a mini rack mount for my US8 unifi switch . This includes a mounting for an 80mm fan in the side. I only used a double sided tape to secure it. It is not necessary as the switch doesn't overheat but if you have a fan laying around you can use it.

I don't have any experience printing this in PLA but i don't recommend it cause the switch can get hot. At least print in PETG or better ABS.