This delivers more air than my previous fan duct.
Suitable for V2 Nozzle.
Clearance is 3mm to platform and 2.5mm to heater block.
May be suitable for dual extruders (Untried yet)
Push on and Nut Mounted variety.
Updated Both Fan Ducts May 16/2013 (better wall thickness. Firmer fit for Push on Duct. Old one started slipping after a bit of use)
See http://www.thingiverse.com/thing:77107 for what looks to be a good improvement to my push on Duct.
Best to Print in PLA90 or ABS. This is a must if you have a heated bed.
Print either Nut Mount Duct or Push on Duct
Fan mount holes are made small so you can screw the screws straight into it without a nut too.
Careful cleaning strings around cable guide (It's a bit delicate)
zip file contains the UM model from http://www.thingiverse.com/thing:29513 as well as the Fan Duct. Open All.iam