Converts a 40mm fan (with roughly 23-25mm center hub) into a radial fan weighing 22 grams. Everything can be printed without support, just rotate them because my STL files are always sideways. I suck at making parts that fit together (and many printers do too) so this is all glue together, except for the fan itself. The blades are springy to accommodate multiple hub sizes, and the included adapter ring can be used on smaller hubs. I have also included my cooling shroud for attaching to the end of the fan to cool both the print and the cold end of the extruder. Mine moves much more air than the fan it came from, and makes less noise. See instructions for details.
The Motor Mount glues to the outside of the Bottom (or Top, depending on the motor's rotation) and the motor (which you have to break out of its circular mount, and break the blades off of) gets glued to this. The Fan gets compression fit on the motor's hub (or onto the adapter ring) and then the top gets glued on. See the photo with the green mousepad for a fully assembled fan, and the other photo of one mounted to a printer with the included shroud. Good luck!