Anet A8 prusa-i3 circular fan duct

by Sjouke, published

Anet A8 prusa-i3 circular fan duct by Sjouke Oct 12, 2016
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This thing was modified with Tinkercad. Edit it online https://www.tinkercad.com/things/ap9jexbusvh

Print Settings


Anet A8










I Printed this PLA 190/60 on a glass bed with just a wiff of hairspray.
1st layer slow speed, no fan.
2nd layer go for it

How I Designed This

The original file came from thingiverse but after printing it i found it didn't "sit" at the correct height and it was connected to the fan too loose, so i modified it to make it fit better (to my needs)
MEASUREMENTS : Underside of the duct is 23.5 mm lower than the underside of the FAN it connects to.(not counting the bit that goes in the fan) The bit that goes in the fan was enlarged a bit to make it a more solid connection (fits in hole 17x13 mm).
Zero your Z axis and measure the distance like in the photo to see if this duct will fit your printer. anything from 25 mm till 28 mm should be ok without the need to modify the file, leaving approx. 3 to 7 mm clearance with your project.

measure from the top of sheet of glass till underside of fan where duct connects

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hey I was wondering if its okay that I make a couple adjustments to fit the e3d extruder I was just going to take a section out so it doesn't hit the thermos and heating element

You have my blessing...........

I can give you the model I made if you want to post that to

You can publish it here yourself and get the credit for your work. No problem. Together we create awsome things

Just a dumb beginner question because I read it in the description. where can I define at which layer the fan starts to blow? So how do I achieve that Layer 0 is printed without and the rest with fan?

nice design, but i get a really annoying high-pitch whistling sound while using it. does anybody have a solution to this?

hey great design but doesn't your fan needs to be in the other direction?


check your image. In the Anet a8 tutorials you see that the fan icon is inside. Yours pointing in the other direction this means that your fan is not blowing inwards but outwards?

Great design though!

the FAN sucks air in through the centerhole, directs it in the neck of the fanduct, the air exits the fanduct throuigh the little holes on the inside of the ring, blowing a little down towards the extruded plastic UNDER the nozzle. itsasimplehey.

hey I mean your side fan, not where you put your designed fanduct on ;) the other fan with the YYQ icon (made in China)

See also this exact video: https://youtu.be/EbNocv6-OOQ?t=3m19s

This means, you have the same fan as seen in the video that you mounted the fan incorrectly?

The icon should be fitted against the heatsink and now point outwards. It looks like that side fan is blowing..

Now i see what you mean. Guess it does not make much difference the heatsink does not get really warm anyway, sucking air through it or blowing air through it. I put it together more than a year ago like this and both ways do what they should, keep it cool. Btw i never used any videoguide i just did what was logical to me at the time. One more remark you dont have to follow the chineese video to the letter sometimes they make mistakes putting it together too, look at their aluminium H plate under the hotbed, they mounted it wrong side up, so the belt doesn't line-up correctly https://3dprint.wiki/reprap/anet/a8/bed-carriage.
Any way that works ok is the correct way, thats the beauty of it.

Lol, just noticed my bed is like that. Does it really matter?

as long as you only print in the center it wont make much difference but near the ends (front and back) it will affect the belttension somewhat

Ok If you say you have it running for a year it is probably ok! I have mine for a few months now so I just thought perhaps I should point it out :) Dont want bad things to happen! So if you say it works for you, you are fine!
I will try your fanduct that you have designed it is really cool! And happy printing!! Cheers!

I Printed some ducts and i like this the most. Because of the bent to the left case i can still see the nozzle from the right and it seems to work great. I had to cut small pieces at the corner but i guess its because one of the axis is overshooting a little while cornering. ( Im new to 3d printing so sorry if i sound stupid)

Or short: Great design, Thank you!

does it fit to the mk8-extruder-unit of the prusa i3 pro b since the anet a8 is pretty similar?

The measurements of the duct are in the description

I made this yesterday. I have not had a chance to print something with it installed, so I cannot verify the improvement in function yet, but I can say that I was not able to install this until I sanded down the sides. In comparison to the air duct that came with my Anet A8, it appeared to be about 0.3mm larger side to side. After sanding it down, it fit very securely and I am anxious to print something to see how it works. It appears to ride about 2 mm higher than the tip of the extruder, so I shouldn't have any conflict with the print.

It is designed as a tight fit. there are multiple factors that can and will influence the size of the printed items. Stretching your belts will increase the size. not enough tension will have layers not exactly stacked on top of eachother etcetera. After using this circular fanexhaust you should get better cooling of the extruded plastics resulting in less warping better staying the shape you need it to be (that is for PLA). With ABS do not use cooling it will cause warping and detaching off the buildplate.

Guys I have tried a number of times to print this with my A8 and my nozzle keeps hitting already printed areas of the fan, causing quite a ruckus. I haven´t changed any settings and other items have come out fine, even ones higher or wider than this. Any thoughts why this might be? Thanks for your help!

What temperature, to hot makes it warp more if it does not cool quick enough inbetween layers, try lower temperature

Extruder @ 220°C, Bed @70°C.
I`ll try again at 190/60....

It sounds like you're too hot. If printing in PLA, turn bed off. There's really no need to worry about bed adhesion with PLA, especially at 220°. You may want to turn extruder down too. The stock blower nozzle sucks, it may not be cooling fast enough. I printed this in PLA at 190°/no bed heat, 75mm/sec, 2mm layer.

If printing in ABS, keep your temp setting the same 220°/70°, that's perfect, but slow down your print speed to give blower time to cool the freshly extruded plastic. 50-60mm/sec should improve things.

THIS was my very FIRST project!!
Anet A8
NOTE:OEM (the part that fits IN the blower) was12.75mmX16.70mm,the new one was 13.06mmX17.07mm,so some sanding for me as well,the ONLY thing I will need to watch is the block that the nozzle is attached to seems close to this duct.NO complaints here,being retired is fun...............OH! and watched the process every step of the way,its pretty cool I think....
Joe Merritt

Does it fits with anet a6? Thank you

cannot tell you, don't know

does not fit just right on my blower. nothing a little sanding didn't help though. thanks

If the measurements i gave didn't come out alright, you should check your prints with a calibration cube maybe.

Speaking of "Calibration".............does anyone how to calibrate the cheap Anet A8?