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Looking for a good part cooling solution
After upgrading my A5 with the Zesty Nimble Remote Direct Extruder, I am now working on exchanging the hotend with an all-metal E3D V6. The adapter design has now reached a state where I need to decide for a part cooling solution:
Obviously, there is no space to use any part cooling fan duct that fits to the original printhead. Also, while the Blowhard 3000 I am currently using, is a major improvement over the original fan duct, I am wondering if the cooling performance can still be improved. Here is a part cooling torture test I printed at 100% fan speed (I deliberately chose a PLA filament which I know is difficult to print if not cooled properly):
There is a slight anisotropy in the results, as can be expected, with acceptable results up to and including 40° overhangs. The overhang facing the front (towards smaller y) degrades heavily at 50°, whereas the one facing the back (towards larger y) starts to degrade at 60°. The central spire has some issues below a certain diameter when retracts are involved, but that relates less to the part cooler and more to why I want to change the hotend in the first place.
From looking at how the airflow interacts with a water surface, the main volume does not seem to hit the area under the nozzle. Instead, there a 3 distinct indents at ~7-10 mm from the nozzle. I'd hoped for a sweet-spot moving the z-axis, but there wasn't any, at least not where the nozzle didn't submerge..:
Searching for possible solutions, I came along the Petsfang which appears to focus the air flow directly under the nozzle:
Unfortunately and apart from the fact that it does not interfere with the hotend cooler, it does not fit on the x-carriage without sacrificing print volume (28mm in X, 8mm in Y and acceptable 14mm in Z):
The Petsfang is under a license that does not allow for derivative work, so I cannot simply modify it to avoid collisions. But there may be other fan duct designs with similar performance I could use.
So if you, despite the lengthy post, are still reading this and want to share your experience with your part cooling fan, please do so. If you feel like printing the torture test, I'd be very interested in pictures of your results.
Thanked by 1Samuel Pinches