ybjack Rear mount layer fan V2.0 for Geeetech i3 ProB

This is an adapter for placing the layer fan on the backside of the extruder.

Because of it passes through the gap between the extruder holder and the print bed, it is likely to interfere with your paper clip.
The two opposing nozzles are offset from each other and generate "tornado" swirl flow there.
To install it, fasten it with lower bolt of X Carridge's lower linear bush holder.

rear_mount_fan_duct_TypeA_NEW.stl:
Requires 50mm sirocco fan. This is new version of https://www.thingive