This is an adapter that fits in the original slot on the exhaust on a K40 Laser cutter.
It prints in two parts that are held together just by friction but you can also glue them. Its made to fit a 130mm aluminum duct but you can adjust the model with the attached .f3d file.
There is an optional grill for catching large debris included that you can either print or cut out of wood.
The author hasn't provided the model origin yet.