Double 2.5" HDD/SSD mount for 3.5" bay

Easy and pretty much universal adapter to fit two 2.5" drives in the same slot as a 3.5" drive. This allows you to fit twice as many drives in old cases that didn't have 2.5" mounting holes, like the one I'm using for my NAS. The drives have enough room to breathe on all sides and are also separated so they don't transfer their vibrations to each other. It has front and back openings, so you can blow air right through them with a fan.

The adapter is currently very thick and sturdy, I might see how much thinner I can make it before the heat generated from the drives melts it.

July 2025: added STEP file, in case anyone wants to mod it.