40mm Fan Duct - Silencer Ender 3, no hardware required.

V2
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 cle