Helix fan duct (customizable, parametric) for Anet A8 and the like

by burbilog Dec 26, 2016
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"it does not restrict air flow", sorry but it does, you'll get many cavitations at square angle
Moreover pressure and flowrate are largely tortured through the 3D shape

Do you think you could modify so there is a longer path between the fan and the duct? I have a different printer/hotend, but think this would work beautifully. I am using this mount: https://www.thingiverse.com/thing:2178694

Notice how far back the fan is? That's the reason I'd like that part to be able to be extended. Hope this makes sense.

Wanhao Duplicator i3 V2.1 E3D Titan Aero Upgrade

I see no fan at all. But this model is parametric -- you can change almost anything. Just install FreeCAD, load helix_fan_duct_v7.fcstd, go to cf spreadsheet (it's a spreadsheet-like object inside source file) and modify parameters according to your geometry. This drawing explains all variables in cf spreadsheet: https://thingiverse-production-new.s3.amazonaws.com/renders/4c/a4/cf/00/e8/8eb4ad74993b5805038e597f813e8b0b_preview_featured.jpg

Sorry, here are some photos showing what I mean::


The distance is far enough that I'd like to see if you could add two more parametric settings. one for the height of the throat to fan, and one to extend the throat from fan to where it hits the part that flares out. :)

So, do you want some kind of flange around the throat? Can you sketch your idea on paper? I still don't grasp it :) BTW, large duct is going to be too heavy, even mine ducts are heavy and tend to fall sometimes, yours is going to be much heavier, probably two or three times more than mine. If you create bigger fan duct then you'll have to secure it somehow with some quick-release mechanism, because it's going to be difficult to switch between duct and no duct (or quickly snatch the duct in case of something going wrong).

Or just design some very simple square angle bracket, screw it to your hotend fan and attach your fan to that bracket in front of the extruder. This way you'll place it very close to the hotend.

Would this block the auto leveler that is placed with the blower fan?

It depends on your mount. It won't block stock Anet A8 autolevel: https://ru.aliexpress.com/item/ANET-2016-New-Arrive-High-Quality-Auto-Leveling-Position-Sensor-For-Anet-A8-Prusa-i3-3D/32764950220.html because it's mounted behind the extruder. Also it won't block this mount too: http://www.thingiverse.com/thing:1911146

It will block mounts like this: http://www.thingiverse.com/thing:1852762

18mm auto level sensor support for Anet A8 right side
Auto bed level holder (capacitive sensor ex. LJC18A3-H-Z/BX) Anet A8
by LucaCap