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Semi-Circular Anet A8 Fan Duct

by lokster, published

Semi-Circular Anet A8 Fan Duct by lokster Dec 9, 2016
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Summary

This is my version of the "circular fan duct" for the Anet A8 printer (and other compatible printers).
Highlights:

  • it's actually semi-circular. The circular one deforms after a while if printed in PLA (and I use/have only PLA), so I designed this version.
  • it snaps to the fan a lot more securely (on the outside of the fan), and there is no chance of falling off during print.
  • designed in such way, that the air blows just below the tip of the nozzle. The original design was blowing too far down.

Designed in Blender, by heavily modifying http://www.thingiverse.com/thing:1874390 - simplifying the mesh, adding the new attachment part etc.

Print Settings

Printer:

Anet A8

Rafts:

No

Supports:

No

Resolution:

0.2

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Printed this and tried to use it, ended up cooling my nozzle way too much, to the point that I got a thermal runaway...

yes me too, it looks like it needs a degree or two of pitch down. Sweet design tho was thinking of taking a heat gun to it see if i can make it work .

Maybe your nozzle / throat / heat block is not mounted properly e.g. it is too low.
It also helps a lot and is highly recommended (no matter what fan duct you use) if you run PID auto tune when you install new fan duct - the temperatures are much stable afterwards.
Anyway, I'm working on a different new fan duct now, so keep an eye :)

Great design, works perfectly :) Thanks

Feb 10, 2017 - Modified Feb 10, 2017

Sorry, 1 question, what distance should be between tip of the noozle and the bottom of the fan duct? I read it is something around 7/8mm ?

I just printed this, but havnt tried it yet.
But it seems to be a little short.

It depends on how you screwed your throat tube if this is what you mean by "short".

Feb 3, 2017 - Modified Feb 3, 2017

I made one... and even when it's near perfectly level with the nozzle tip (added 6mm height for mine, thanks for including blender file!) it blows too directly and cools the head. Fan speed reduced to 75% max 50% min seems to work... but not ideal. Air holes should point slightly more down angled to avoid cooling the head itself so badly.

By far the best fitting and usable fan duct I've found for the Anet A8. I've tried about 4 or 5 other circular designs on here, but they all warped after the first print and one was so big it would hit the left Z rod when it would go to home. You do have to remove the fan to put this on, but it is only two screws and takes like 30 seconds. I printed mine with PLA at 0.2mm layer height with 100% infill.

I've been using the semi circular one... http://www.thingiverse.com/thing:1874390 and it's been holding up fine in PLA, no warping. Just doesn't blow high enough... and this one blows too high :-(

Extruder Cooling Duct for the Anet A8 Printer
by Leo_N

im making a remix of this to my 3d printer (custom). what is the recommended distance between the tip of the nozzle and the bottom of the fan duct?

For my own printer, the fan duct is designed in a such way that the streams of air are focused at the center of the circle, around 7-8 mm below the bottom of the fan duct.

to small height....you can upload other height sizes?

to small height....you can upload other height sizes?

Note: You must remove the front fan and shove (read: rather forcefully) this piece over the airflow opening, then re-mount the fan to the extruder unit. Not a major inconvenience, but something to be aware of.

A tip for improving the model: Make the hollow channel on the side wall go straight through the top, this would have made installation a bit easier.

What is the infill density

I have made several of the circular ones and I made the mistake of adding infill, this is a hollow component so no infill.

Comments deleted.

Great job, are you using Cura and if so would you share your Cura setting? I'm new to 3D printing I just got my Anet A8. Thanks

I've had better luck with Slic3r than Cura, in Repetier, on mine. Cura won't even insert M190/M104 heatup in the G code for me or any temp changes. Only problem I've had is getting bridging to work right but I'm thinking it's cooling/fan related more than settings... 30mm/s with a 0.5 bridge flow ratio is what I'm using now with the full circular duct... hoping this duct fixes it so I can go back to 1 bridge flow ratio. Did you get the 0.4 nozzle version? I replaced the nozzle mine came with as well, using a .3 right now and the quality is insanely better.

How did you manage to print the top flat surface that comes right out of the semi-circular one without any supports?

Comments deleted.

Great design! Thanks

You read my mind. I print the full circle fan duck but the air flow is not enough.
Thanks

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