Semi-circular e3d/j-head fan duct cooler for Flying Bear P905

thingiverse

e3d/j-head v6 semi-circular 50x20mm blower fan duct This semi-circular 50x20mm blower fan duct is created by merging two models - the FlyingBear P905 Turbo Fan Cooling system and a semi-circular design from Thingiverse. The top half comes from the "FlyingBear P905 Turbo Fan Cooling system" model, while the bottom half is inspired by a semi-circular Anet style that I've since lost track of. This fan duct is designed specifically to fit an e3d/j-head v6 hotend from this mod: https://www.thingiverse.com/thing:2772682. Several modifications are applied to this design: 1. The blower fan hole is adjusted to accommodate a 50x20 mm blower fan. 2. The fan duct's side walls are increased by 1 mm for added strength. 3. The top part of the fan duct is enlarged by 2 mm, making it easier to print the bottom layer. 4. The narrow areas of the fan duct are widened to improve stiffness without altering the internal structure. The Sunon 50x20mm blower fan (https://www.digikey.com/product-detail/en/sunon-fans/GB1205PKV1-8AY.GN/259-1317-ND/1021167-) is a quieter alternative to cheaper 10 mm fans. I initially tried printing with ABS for added heat resistance, but due to shrinkage issues, cracks appeared in the narrow areas. To avoid this problem, I now print with PLA and apply heat-resistant paint. Before applying heat-resistant paint, follow these steps: 1. Attach the printed fan duct. 2. Heat the bed to 80 degrees Celsius. 3. Position the fan as close to the bed as possible. 4. Allow the fan to warm up until it's easy to adjust the lower blower part. 5. Adjust the lower circular blower part until there is equal clearance on both sides. 6. Remove and paint with heat-resistant paint. 7. After drying, reattach and heat the bed again to 80 degrees Celsius. 8. Verify that the clearance remains unchanged. 9. Allow the bed to warm up the fan duct slightly before cooling it down. This process can be repeated a few times for optimal results. The fan duct should not sag when heated to 80 or 100 degrees Celsius after this treatment. The image shows two bridge print tests using 100 and 50% fan settings. Version 4: Several changes have been made in version 4: 1. The bottom of the top half is increased by 2 mm for better layer adhesion. 2. Extra thickness is added to the side next to the extruder, addressing a common issue that occurred after one year of printing. 3. The wall thickness on the side is increased to 0.8 mm. With these changes, it's now possible to print with eSUN ABS+. To print this design with eSun ABS+, use the following settings: Layer Height: 0.1mm Wall/Top/Bottom Thickness: 3mm Top/Bottom direction: [90, 0] Infill: 50% Temp: 235 Bed Temp: 110 Fan: 50% Support: Yes (Touching Buildplate) Brim: 10mm