Needed some way to mount cooling fans in my dual extruder setup. The good thing about the direct drive extruder is that most things are very easy to access. To avoid having the fans mounted in the way they are attached to the carriage with bulldog clamps. In this way its easy to remove them if you need to clean the teeth on the extruder or dissemble parts of the extruder. This mount is made for a 40mm fan. The dual extruder mount can be found here. http://www.thingiverse.com/thing:465642