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lance-greene

printed fan shroud in PLA or ABS?

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My understanding is that fan shrouds should be printed in ABS. Whether that is "must" or "better to" I do not know. I have some shrouds I want to print but I was told they should use ABS, so fearing that the cr*p will muck up my nozzle, they keep getting deferred from the print queue!! I assume their proximity to the extruder dictates (or suggests) a higher melting point than PLA

 

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I've used two fan shrouds and both were printed in PLA. Each had provision to fix a small metal shield, cut from a tin can, which follows the contour of the heater block. The "Zetoff" fan shroud did exhibit a tiny amount of distortion from heat on the bottom edge near the heater block, but only after a lot of use. It didn't affect it's working well though.

https://www.youmagine.com/designs/fan-base-um2

The second one, https://www.youmagine.com/designs/ultimaker-2-fan-mount-dual--2

I'm using without any heat shield and there has been no distortion at all.

Of the two, personally I prefer Venkels design, as it's a bit smaller and neater and doesn't quite focus the airflow so much onto the nozzle. It has a bit more broader spread of air. Also you don't need to remove the fans to take it off.

Ultimately, they're both really good shrouds (imho) and well worth printing out :smile:

One other thing, you could always use XT for a bit more heat resistance or that new PLA-HT stuff which looks promising?

 

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they provide better cooling by placing the duct of the right side fan closer to the hotend, the stock one is designed with the duel extruder in mind, but it isnt really needed unless you have 2 extruders, so the printable version places the duct closer to the hot end providing better cooling, its really noticable on the ultimaker robot print, where his right ear is always a bit melted because of the stock fan shroud design, if you print one with the printable shroud it fixes his ear problem.

 

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