I had many enclosures that all died for some reason. I use a premade external from WD or Seagate. those lack fans usually but if you dont keep them on 24/7 its not a problem. they also shut off aftera period to cool off.
I use this
Newegg.com - thermaltake blacx
you swap the hard drives like toast, the bad part is you can always damage that hard drive when not in use. I stack mine on a shelf here. I repair a lot of old HDs I find at garage sales or reformat and repair desktops so the thermaltake fast swap is a favorite.