Anet A3S Vortex Ring Fan Duct

thingiverse

Design for Anet A3S metal frame a new fan duct. The ring doesn't blow air directly at the nozzle, instead swirling it around and below in a vortex. This keeps the nozzle from cooling with part cooling fan airflow. It also bolts into place, requiring longer screws or cutting off mounting tabs to secure. I adjusted my nozzle to sit higher, reducing distance between extruder and heatbreak top. Currently running mine as Bowden feed with MicroSwiss mk8 all metal hotend. The duct fits snugly into print carriage frame, leaving room for a small LED light strip to shine through. It's centered on the nozzle, unlike most other ducts I've seen. However, fan outlet isn't centered, so I centered it as best possible. March 30, 2018: I reworked internal cavity for better airflow and entire design for easier printing. Removed secondary model with extra outlet due to its small size preventing air flow. Added thermal images of fan and hotend - one without fan on and the other with it running. The second shows air doesn't cool the hotend itself, though there's a chance air may bounce back depending on print design.