Replaces the original material cooling fan, which has significant amount of back-blast (, i.e. inefficient,) with an impeller type fan, and a fan duct and nozzle design similar to that on a Replicator 2.Print quality is improved, but nozzle design still needs improvements. I bought my fan at an electronic parts supply store. It Part was printed in PLA  on my Ultimaker using Cura 14.03.Designed using ViaCAD v9.1. Print part at 0.2mm layer, 80%~100% fill, no support.2. Tear out support structures.3. Replace connector on fan if necessary. 4. Mount fan to printed part using 20mm long screws and nuts.5. Mounts directly to carriage thumb screws using 2 nuts.6. Connect and tidy up wiring.