Same as V1, but added fillets so that the part can be flipped over and printed with the opening down. Now it does not require supports, but might require a brim if bed adhesion is an issue. I printed without a problem on a clean glass bed with no hairspray or glue, but the first layer isn't very wide so I cut the speed back to 45 mm/s in Cura with a base layer speed of around 15 mm/s. Since it's small these changes make little difference in overall print time. There is literally zero cleanup in these pictures, set travel to "not in skin" to eliminate stringing inside the bell.
I wanted something to put on the extruder fan to add some distance from the blades that wouldn't negatively affect airflow. I was pleasently surprised to find that it quieted the fan noise substantially. I also designed it to be a press fit into the stock Ender 3 fan so that I wouldn't have to source longer screws. A small amount of sanding may be required on the lugs depending on how accurate you printer is.
Set travel to "not in skin" to eliminate stringing inside the bell.