This is a mount and duct for a 40mm cooling fan that will fit the std Sells Mendel X carriage. I could only find one fan mount for this venerable machine and I wanted to duct air closer to the hot end than this would allow. The duct will mount 40mm fan and attaches to the carriage by replacing one of the belt clamps. I have sized the model for my Mendel on which I have replaced one of the belt clamps with a tensioning clamp. Which you can find here http://www.thingiverse.com/thing:16012. The model is slightly optomised from the one I printed to save on plastic and weight. Please be sure to that when your print is finished your skeining software homes to Y =0 and X = 130, i.e. over the purge plate at the last layer height. If you home X = 0 to high up the Z axis then a crash may occur due due to the reducing size of the triangle frame work. This is one of the reasons I am moving to an Orca so that the X axis is fixed at the top and I can hang all sorts of crap of itthe SCAD file started out with the intent of being parametric but a failed big style so mega hacking is required if you want to use another size fan.Assemble as shown in the photos, I used an aluminium shim between the duct mount and the belt clamp