My Ender 3 blower motor kept failing because it would suck up fine stringing off of larger prints. This was especially bad with some particular filaments. I designed this to help direct the airflow to come more from above, while not restricting airflow. It is made to fit onto the default blower shape and to use the existing screw holes. Print the parts separately and then just glue down the shroud/duct-work onto it with a little bit of CA glue.