This adapter allows a standard 3.5-inch hard drive to be mounted in most 120mm fan slots. It is designed for versatility and can accommodate any 3.5" HDD. I used M3 screws and nuts to mount it to my case. I suggest washers for the top if doing M3 since that's a bit small.

Heat inserts are an option, too. The top hole diameter is 4.5mm if anyone decides to do that instead.

For optimal durability, it is recommended that this mount be printed using a strong material with multiple walls and high infill.

My Unraid server using the adapter since these cases are an absolutely awful choice for a NAS :)