Here are some enclosures I have found. I have used 2 of them, myself.
https://www.thingiverse.com/groups/omega/things
https://www.thingiverse.com/search?q=onion+omega&sa&dwh=27594136a27ef2e

These are 2 of the ones I use. They work great.
https://www.thingiverse.com/thing:2068124
https://www.thingiverse.com/thing:2067555

I dont have a printer, or print enough to warrant buying one, so I use Shapeways to print mine. Just upload the files and choose the material, they do the rest. Turn around time is pretty quick, too.
https://www.shapeways.com