Installed the z-braces mod by Azza but (still) dealing with the upmost annoying sounds 3D printing brings along? Try these! :)
Inspired by the impressive results I obtained when using this thing on my Folger Tech. Kossel 2020: http://www.thingiverse.com/thing:1313461
It's basically the same geometry with some cut-outs to snuggly fit Azza's z-brace mod, see photos.
/Update June 2016: Some people had issues with the dampeners "collapsing" within a couple of weeks. Possibly due to some problems with the filament. I added a reinforced version of the dampeners now: 25 mm depth (from 20 mm), and 15 mm spacing in between the upper and lower part (from 12 mm). Should give quite some tolerance if you have problems.
My recommendation: If you print in PETG or ABS, use the standard version. If you use some cheap'ish (Esun, Hobbyking etc) PLA filament, use the reinforced version (...reinforced.stl). Have fun! :)
/Update Sept 2016: DI3 Plus? Just use the reinforced ones, they fit (Thanks Joemadd3n! :) ).
/2nd Update Sept 2016: Added a video! :)
/Update Oct 2016: Worried about the side to side wobble or sagging of the y frame? Use teknikk7's additional middle dampeners: http://www.thingiverse.com/thing:1800476
0.2 mm layer height, 0.4 mm nozzle diameter
Print 4x (doh...). Designed for PLA, but print it in any other plastic if you like. Do make sure to use 100% infill though. The wall thickness is 1.6 mm only, so use either a single perimeter wall or two at max (otherwise Cura & Co. may do funky stuff).