Bed Fan Duct

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jimc
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Re: Bed Fan Duct

Post by jimc » Sat Oct 15, 2016 2:07 pm

very similar to mine
IMG_5929.JPG

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quaver
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Re: Bed Fan Duct

Post by quaver » Sat Oct 15, 2016 5:11 pm

jimc wrote:very similar to mine
IMG_5929.JPG
Indeed it is Jim; very much inspired by your design. I was initially going to print and use yours but wanted to "tinker" with it a bit. One thing led to another and before I knew it I had spent far more time making modifications than I had planned. Is the photo of the printed part made with carbon-filled material?

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jimc
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Re: Bed Fan Duct

Post by jimc » Sat Oct 15, 2016 5:19 pm

Yes thats the esun carbon filled nylon

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quaver
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Re: Bed Fan Duct

Post by quaver » Sat Oct 15, 2016 5:21 pm

zemlin wrote:Nice looking rig, and interesting analysis. I'll try the cone thing on my duct setup.
Thanks zemlin. A cone should make an improvement to any ducted fan arrangement. It occurs to me that a cone might also be beneficial for non-ducted bed fans as well. Air passing over the surface of the cone will tend to "stick" to it, following its curvature and being bent toward the flow axis due to conanda effect. This would tend to improve airflow and should also have the added benefit of concentrating or focusing the stream nearer the flow axis. This effect would be reduced when the tip of the cone was near the print bed but as part height increases it would likely prove beneficial. Would likely want to use a cone with more of an acorn shape for non-ducted applications. I have not tested or analyzed this shape but offer it as a reasonable place to begin testing.
Attachments
coanda_cone_dims.jpg
General profile of cone for fan without duct
Last edited by quaver on Sat Oct 15, 2016 6:23 pm, edited 1 time in total.

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quaver
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Re: Bed Fan Duct

Post by quaver » Sat Oct 15, 2016 5:30 pm

jimc wrote:Yes thats the esun carbon filled nylon
Have you used this material much? How are adhesion and stringiness properties? What size nozzle? I have read that the fibers tend to like a 0.4 nozzle or larger. I have been looking at the Colorfabb XT-CF20 which is a carbon filled PETG. I have also looked at MatterHackers NylonX. The principle reason for changing to the E3D hot-end was to be able to print these materials.

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quaver
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Re: Bed Fan Duct

Post by quaver » Sat Oct 15, 2016 5:37 pm

insta wrote: I will trade you a PEI MIC6 bed for a 50mm fan duct STL that fits my setup and can be printed without much in the way of supports.
I'll gladly take that offer insta... if your need is not urgent. It may be several weeks as my schedule is going to be a bit congested. :)

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insta
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Re: Bed Fan Duct

Post by insta » Sat Oct 15, 2016 7:25 pm

I'm game. No huge rush for now. It'll probably take a few iterations :)
Custom 3D printing for you or your business -- quote [at] pingring.org

crazyg0od33
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Re: Bed Fan Duct

Post by crazyg0od33 » Wed Oct 26, 2016 10:07 pm

keeping an eye on this in case a dual V4 version gets created.

This looks really cool!

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quaver
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Re: Bed Fan Duct

Post by quaver » Thu Nov 03, 2016 3:40 am

Printed the 50mm fan guard. Successfully reduced ambient noise. Measurements taken at 100% speed set point. Calculate rpm to be around 7k rpm.
Attachments
IMG_2121.JPG
50mm fan guard
IMG_2119.JPG
SPL with stock fan guard
IMG_2123.JPG
SPL with new fan guard

thunderbt3
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Re: Bed Fan Duct

Post by thunderbt3 » Thu Nov 03, 2016 1:15 pm

Would it be possible to make a noise measurement with no fan guard for comparison purposes?

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