Part Cooling Fans/Ducts



  • Also on my todo list is to make something similar to a Berd air but I'd likely use something like a Koi pond air pump because I've heard the Berd ones are noisy. (Koi like deep water so a suitable air pump would have good pressure as well as flow). I already have a micro pipe bender so forming the tube should be easy enough.



  • This one has become popular on the RailCore II coreXY printers: https://www.thingiverse.com/thing:3367622. One fellow did mod his further by adding a small hole in the center, between the two primary outlets. This design is actually similar to MHackney's tusk technique.



  • @plasticmetal Thanks for the link. I make the area of the exhaust to be about 45% of the outlet of the fan. If that's working well then I've no need to try and get better than my last attempt which is about 75%!

    Second iteration of the stickman has dropped the feet by 3mm and opened the slot out to 3mm wide. I've yet to test this. Got to go pickup my son now from the inlaws.

    The third iteration is just about to finish printing which has the feet 10mm longer which will cool the IR sensor a little but also cool a little better around the part. When I stuck my my finger under the first iteration with the full on full chat the airflow feels like it is going around the back of the heater block more than the front, so hopefully this should balance it a bit more.



  • Try placing a small dish of water on the bed, under the nozzle, to help visualize the air flow.



  • @plasticmetal said in Part Cooling Fans/Ducts:

    Try placing a small dish of water on the bed, under the nozzle, to help visualize the air flow.

    That's a very good tip 👍



  • @plasticmetal I'll second that. Neat trick.



  • I read it elsewhere. I'm not that ingenious.



  • @plasticmetal fair enough, although kudos for not running with the credit! It is refreshing within this community that people actively credit work that has inspired or educated themselves.



  • @plasticmetal said in Part Cooling Fans/Ducts:

    Try placing a small dish of water on the bed, under the nozzle, to help visualize the air flow.

    What should be the ideal pattern? How do you decide if design A is better than design B?

    [I am using the hypercube evo design, strong flow from one side, and a silicon suck on the heat block]



  • I haven't tried this yet myself, but I would think you'd want to see an even depression in the water, centered around the nozzle. You don't want air blowing on the nozzle, so the depression would look like a doughnut/torus, with the water level under the nozzle not depressed.

    Getting a fan duct to do this, is another story. Obviously circular ducts, like Berd Air, can do it more easily than others. OTOH, it doesn't have to be perfect - just better than whatever you're using now ☺



  • I just adapted a bracket to fit the classic Dii cooler to my setup. I have yet to find a better duct.

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