A simple box with holes that are made to fit M5/M6 nozzles. I used a tap on the holes afterwards so that the nozzles would thread into the block.
I suggest that you scale the model up if you have M6/M7 threaded nozzles but do not have a tap set.
I also uploaded the .STL in the wrong orientation. You'll want to print it with the holes facing up for best results!
Nozzle_Holder.stl | 1.5MB |