For installing of a 50mm blower fan to cool prints.
To be able to make room for the print cooling fan, the original 30mm hotend cooling fan has to be moved to the other side of the spider, to sit next to the probe pin. Print the attached fan-mount.stl to install the original 30mm fan to the spare mounting hole.
Use a 16mm m3 screw and m3 nut to attach the fan duct to the spider, then insert the 50mm fan to it. I was intending to use a zip tie to secure the fan but it seems the duct is tight enough to secure it without any other help.