Greg SaunierAug 18, 2024

I've done lots of testing on nozzle fan ducts and I have found a recipe that works for me. However, I've never tried CPAP or berd air (pump), so I will speak here for blowers as a source of airflow.

Image credit: Nozzle fan duct of BearExtruder V1 generated by Keith Bennett https://x.com/thisiskeithb

A small thread ⤵️

#3dprinting #cooling #shroud #duct

Keith Bennett (@thisiskeithb) on X

@MarlinFirmware team | 3D printing | serial modder | beta tester

X (formerly Twitter)
Show threadDennis.Aug 18, 2024
@bear_lab Hey😊
A while ago I also tested berd air, with a self-adapted duct: https://www.printables.com/de/model/234017-bair-berd-air-prusa-bear-fan-shroud
Maybe that helps 😊
On my Voron I‘m using cpap with a disturbingly loud 4028 fan, but the power of that is just amazing.
Lower resonances on the toolhead, therefore more acceleration without impact on results
Printables

Show threadGreg SaunierAug 18, 2024
@brokenminded interestingly you did the 3 sides like I described! I have the feeling that berd air on a single side, very focused, at few mm of the nozzle would be better. But nozzle fan ducts are a mystery so I might be totally wrong. If not better I would try 3 sides but very close to the nozzle and straight out of the end of the tubes.
Show threadDennis.
@bear_lab At first, I simply tried with a short pipe, directly pointing below the nozzle. The problem was the heat - my ASA -printed duct melted very fast. I think, because of the brass tube.
Since I got CPAP on the voron, I‘m having ANC headphones laying around😅
Aug 19, 2024 at 4:41amWeb
Show threadGreg SaunierAug 19, 2024
@brokenminded Oh I didn't imagine it was getting that warm but yeah slow airflow.
Good idea the ANC :D