Ender 3 Fan Duct

thingiverse

Ender 3 Fan Duct Insert for Secondary Fan: Improving Bridging Cooling and Reducing Air Flow Issues. Not Happy with Stock Fan Duct's Performance in Directing Air to Print Area, So Created Custom Insert. The Insert is Made of Five 45-Degree Duct Pipes That Focus Air Flow Directly onto the Print Instead of the Nozzle or Hotend Block. Additionally, the Main Fan Creates Significant Air Flow Issues When On, Blowing Air Across the Hotend Towards the X-Axis Rail. To Address This, I Added Fins to the Insert to Redirect Some of This Air Downward and Improve Cooling Efficiency. Currently, I'm Experimenting with Printing PETG Filaments Using a .6 mm Nozzle. However, I've Experienced Stringing and Blobbing Issues Due to Cheap PETG Filaments. To Resolve This, I File and Sand the Printed Insert Before Installation. To Install the Insert, Simply Insert It from the Bottom Upward into the Secondary Fan. Tighten the Screw Closer to the X-Rail First to Ensure Secure Fitment. There's a Noticeable Air Insulation Gap Between the Insert and the Hotend Nozzle & Block, Allowing for Either PLA or PETG Filaments to Be Used. If Printing with PLA and .4 mm Nozzle, Filing and Sanding May Not Be Necessary. My Preferred Settings for PETG and .6 mm Nozzle Are: 245 Degrees Celsius for the Nozzle, 75 Degrees Celsius for the Bed, 94 Percent Flow Rate, 60 Percent Infill Density, 25 mm/s Print Speed, Four Layers for Wall, and Five Layers for Top/Bottom. I've Included My G-Code File for .6 mm Nozzle PETG Printing. As for the Insert's Effectiveness, Cura Offers an Experimental Option Called "Enable Bridge Settings" That Enables 100 Percent Fan for First Skin Layer. When Activated, You Can Feel the Air Flow Pushing Downward from the Five Ducts, Indicating Improved Cooling Performance.