I created this to bolt up to the 30mm cooling fan on my Kossel (Thingiverse object: http://www.thingiverse.com/thing:222873 )
I liked the idea of the LED ring, but wanted it fully wrap around the LED ring completely, plus mount on my 30Mmm cooling fan.
This part is printable without support, and just needs a little cleanup to get the LED ring to pop in tightly for a nice, snug fit. (Or you could increase the print size by 1% or so if you'd like.)
Print it in ABS unless you wnat to see it melt during the first few prints, LOL!