This is a focusing nozzle I made for my M18 Fuel Leaf Blower. It may not fit the newest version of the M18 Blower as they have reduced the size of the factory nozzle. A proper fit can be achieved by scaling the STL.
I can't say it dramatically increases the airflow, but it is my attempt. The M18 Fuel Blower uses a standard fan to force air, where some other blowers use a centrifugal impeller. The fan produces a high-speed, low-pressure flow, which is fine for this application. The centrifugal impeller would produce a higher pressure flow, allowing the nozzle to accelerate the air.
