I have held off changing the fan duct on my Ender 3 Pro and Tevo Tornado until I could do some proper back to back testing. I took the chance to test the Bullseye and a simple vent ring duct.

To do this I designed a torture test file, inspired by the All In One micro printer test. The main body is lifted up off the bed to allow a wide and difficult bridge. There are four gradually tilted arcs, from vertical to 80 degrees, pointing up, down, left and right. The reason to see if a fan that only blows from one side is at a disadvantage. The final feature is a central spire that is raised above the rest.

My cooling fan torture test: https://www.thingiverse.com/thing:3167063

Next test might have to be the Hero Me..

Ender 3 ring duct: https://www.thingiverse.com/thing:2912394/
Bullseye (part of PETsfang): https://www.thingiverse.com/thing:2759439
What you need to print for Bullseye (Creality): https://docs.google.com/spreadsheets/d/e/2PACX-1vS2TxsX-kBR6hmoeuBAtugCa8P2651bOPuQJ76QD8jk-UFWg4FWrNI2Ca36mKzLy2FUOWA…

The filament cooling fan on the Creality Ender 3 is connected to the electronics cooling fan so when the filament fan is shut off, the electronics fan shuts down as well. Chuck shows you how to Fix the Cooling Fans. He also tests the Hero Me Fan Duct on the Creality Ender 3 with his Cura profile. See the results on this week's Filament Friday.

Cooling Fan Jumper Wire: https://amzn.to/2ELljRh

My Cura Profiles:
https://www.chepclub.com/cura-profiles.html

Chris Riley - Chris's Basement YouTube Channel:
https://youtu.be/F1mv8yVrS0Q

Filament Friday Tool Kit: https://amzn.to/2MOR00X
Filament Friday 3D Printer Starter Kits: https://bit.ly/2EuojUq
Filament Friday Filament: https://amzn.to/2rgz3Ma

Creality Ender 3/CR-10 Parts:
———————————
PTFE Coupling: https://amzn.to/2BJDog1
Capricorn Tubing: https://amzn.to/2nI2ipS
CR10/Ender3 Silicon Heater Block Cover: https://amzn.to/2PaxJ89
CR10/Creality Ender 3 Nozzles: https://amzn.to/2JF3Ii8A10M Banggood:
https://bit.ly/2RVZySM
Solder Sleeve Kit: https://amzn.to/2Pqqngm…

My complete training:
https://www.udemy.com/blender-279-complete-training-from-beginner-to-pro/?couponCode=BLENDERMASTER9

3d printing with Blender training:
https://www.udemy.com/blender-279-discover-3d-printing/?couponCode=PRINT10

Reference Image:
https://www.dropbox.com/s/5uf9jxxlmj7y2mb/piece%203d.zip?dl=0