Fan Duct for E3D hotend

by euphy, published

Fan Duct for E3D hotend by euphy Sep 21, 2013
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This is designed to grip the main fan duct on the E3D. It takes a 40mm fan, and blows air down around the end. Testing with my finger it seems like the airflow is a bit weak, but it appears to do a reasonable job on cooling the top layer of PLA prints.

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Works great! Only problem: I can't see how the print is going on any more! The hotend is hiding in the circle...

Is there any reason, why the gap, where the air exits gets bigger at the end? Did you do experiments with a radial fan?

No experimentation with other fans. Re slot size: I had a gut feeling that the air pressure is higher at the fan side of the exit slot, and the pressure is lower at the far side. So the slot is smaller closer to the fan to restrict the airflow, and allow more of the air to be pushed around to the far side of the torus. No idea if it actually works that way!

Well that makes sense, thanks!
I might do a redesign using a radial fan. :)

Please do! I've been looking everywhere for a good radial fan mount!

Would this work with the standard injection-molded E3D fan mount

Hello, I don't think that it would work. The new fan mount is a little slimmer and smoother than the old FDM one, so it just won't grip. Have a look at the remixes of this thing though - there's more work been done to make it fasten on better. Good luck!

It's great! Thank you!

Good job, thanks!!..

Muchas Gracias por compartirlo, un saludo.