EDIT: Now updated with a temperature measurement. At 23c ambient the heatsink got up to 38c after writing 250GB's of data to the array.

A fan bracket to mount a Noctua 40mm fan (or presumably any 40mmx10 fan) on your PERC H310 HBA.

I included a little 0.5mm spacer that may help achieve the right friction fit. Alternatively, just scale the model up/down a bit in the Z dimension. Apparently the heatsinks don't have the greatest tolerances.

You probably want to print this in something other than PLA due to its low HDT.

Yes, I'm aware two zip-ties would probably work as well. But where's the fun in that?