Topic: 40mm fan mount
Here is a 40mm fan mount I made. It helps tremendously on parts with fast layer build times. It's very light and minimalist, doesn't seem to affect the printers high speed moves. It does hit the solidoodle 2 door during minimum Y moves. It just bumps it out of the way with no issues. Maybe I'll make a side-mount version.
Works remarkably well with just a hint of warping due to asymmetrical cooling. I would go for an omni-style of blower, but these all seem to block the view of the extruder tip and I like to watch 
Every SD should have a fan IMHO.
http://www.thingiverse.com/thing:38129
