About this 3D model
I needed a 40mm fan mount that I could mount onto my MakerGear Prusa Mendel motors without deconstructing the printer. I couldn't find one online that fit all of my needs. I started with the basic concept from this fan mount for the x-axis carriage: http://www.thingiverse.com/thing:13343 which was based on this one: http://www.thingiverse.com/thing:10032 By flipping the orientation of the mounts, they can be used on differently mounted motors. Here's a Youtube video of the build. Wait a few seconds to see the mount centered in the video: http://www.youtube.com/watch?v=ohoYNmLKtcY&feature=plcp