I made nozzle of 70x16mm outer diameter with rounded short edges to unable blocking airflow while cleaning flat surfces. there are also two rounded holes to prevent air flow blocking while cleaning fabrick.
The author remixed this model.
I made nozzle of 70x16mm outer diameter with rounded short edges to unable blocking airflow while cleaning flat surfces. there are also two rounded holes to prevent air flow blocking while cleaning fabrick. I made also s-shaped flex point of knob to extend flex area and breaking.