I've been using my own fang style fan duct since the original fan duct snapped after the first few prints - figured I might as well share it as I dont see many other models to choose from that offer air flow from opposite sides on the stock CR-10S Pro configuration, which can be important to not disrupt filament shape when bridging.
Its modelled using quite large channelling ducts to decrease airflow friction and make the most of the flow from the 4020 fan, while still maintaining the possibility to see the nozzle.
On other Creality printers, there's been a need for a fan and ducts replacement as the 4010 fan has been too weak. With the Pro though, theres really no need to change the fan to 5015 as the original fan is strong enough - as long as you get a better directed air flow.
With this duct a 150mm bridge is no problem and focuses air in large quantities right below the nozzle.
As I originally printed this without a fan in PETG (cause stock duct, as stated, was broken!) and I wanted the duct to be as large as possible to maintain airflow, I didn't fillet or chamfer the duct to make it print without supports:
Thus, I instead separated the roof parts, and used a soldering iron to heat weld them on. Glue is perfectly fine as well. This way, I could be 100% sure the duct lumen was totally open. Now that the duct works and bridging is no issue, it could possibly print the duct as one piece.
- Print one piece of each (1-4) and two pieces of number 5. I didn't use any supports while Printing, but is optional to use in the nozzle view opening if your printer bridges very poorly. Use PETG, ABS or Amphora, etc.
- Make sure the duct is clear of debris.
- Heatweld or glue the pieces together. If to be on the safe side regarding heat deforming, coat the lower parts of the outflow tracts (in closest proximity to the heating block, part 4+5 and between) with a thin coat of epoxy (optional).
Just replace stock fan duct with the new after putting it together, no mod neccessary other than a slightly longer screw to fit the top fan hole.
Voilá. Great air flow but other than that stock visuals and metallic parts instead of replacing it with plastic carriages. Happy Printing!
ColorFabb Amphora 3300