Mendel90 x-carriage hotend fan duct (always on, for hexagon hotend)

A small printed fan duct for the hexagon hotend (all metal hotend needing an always on fan for cooling the hotends heatsink).

I am using a Mendel90, this fan duct is mounted on the left side of the x-carriage between the rods. No modification required for the x-carriage, you only need to drill a single 3mm bore. The fan duct ist attached using an M3 screw from the top of the x-carriage (see last picture). inside the duct, there is a nut trap for an M3 nut.

The fan duct needs to be printed