COMPLETE Hybrid dual cooling fan mount

Discussion in 'Guides, Mods, and Upgrades' started by fpex, Jun 17, 2016.

  1. fpex

    fpex Well-Known Member

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    I am just playing around with improving the cooling ventilation for the hybrid dual carriage without changing anything but the cooling fan mount.
    Starting idea is a design I used with success on other printers and I am porting to the BB with wings for calling with a 5% angle towards the nozzle plus some some different internal angling to direct the flow better to inside.

    [​IMG]
     
  2. gearmesh

    gearmesh Well-Known Member

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    Nice design.
    You might consider some fins where the air is coming out to help direct the air toward the nozzles so it doesn't scatter as much.
    But even if you don't...I like your idea. And on both sides of course...
    Fan recommendation.jpg
     
  3. fpex

    fpex Well-Known Member

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    Interesting idea the fins. I will see to add a couple of them tomorrow.
    At the the extremities I use internal walling to push the flow below and slightly forward. But I might add a little T to control it better.
     
  4. fpex

    fpex Well-Known Member

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    I am moving to the final version, I tested that is can be printed and dimensions are fine. Current design is this (including changed of air flows)

    [​IMG]
     
  5. gearmesh

    gearmesh Well-Known Member

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    I like the ends
     
  6. fpex

    fpex Well-Known Member

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    Dimensions and flow is yet not right, I will change accordingly and print again.
     
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  7. fpex

    fpex Well-Known Member

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    Tested with the stock blower fan and I am not happy with the fan. and the flow I can get I will look at bigger ones that can deliver even a good cooling with a simpler design.
     
  8. Chase.Wichert

    Chase.Wichert Well-Known Member

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    Taking a little that I have learned from @Alex9779 's sim from the my fan shroud design, most of the air will go straight out the existing ports, and simply blow the air coming from the sides away. You may need to provide some directional walls inside to force more air through the side fins..
     
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  9. fpex

    fpex Well-Known Member

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    That was done sir :)
    My main issue is the fins needs more cooling air because they are very close to the head. Too close fro my taste to use this design with the weak standard blower.
     
  10. gearmesh

    gearmesh Well-Known Member

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    Ditto on what Chase said.
     
  11. fpex

    fpex Well-Known Member

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    I have played with channeling of flow before, I do wish fusion could simulate that also though. Anyhow, while not optimal the flow is fine.
    My issue is that the flow is not enough keep the side parts col enough given how close they are to the heat block (1mm). ABS is no good, maybe annealed PLA would work, but that is a nightmare I never want to use again for precise parts.
     
  12. Alex9779

    Alex9779 Moderator
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    Actually I think compared to axial fans the radial fans have more pressure and compared to the small small fans of my UM2 they have a lot more power. But I agree that a more complex duct might need a bigger fan because of the greater losses of the air path inside the duct and the splitting of streams that must happen inside...
     
  13. fpex

    fpex Well-Known Member

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    I agree that blower are stronger (I only use blowers for calling on my machines), however not all blower are born the same. This one seems pretty weak when I compare it to others of same size I have (but 12v) and channeling works but not enough to compensate for what I wrote above (so all gets too soft)
     
  14. Alex9779

    Alex9779 Moderator
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    @fpex you know you can switch HE2, FAN0 and FAN1 to 12V if you like to? So nothing in the way of trying your fans...
     
  15. fpex

    fpex Well-Known Member

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    I did not know .... I am not a rumba user, I normally use duet boards
     
  16. Alex9779

    Alex9779 Moderator
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    Now you do! ;) There are jumpers right beside the connectors, PWR is the supplied power to the board in our case 24V...
     
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  17. fpex

    fpex Well-Known Member

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    Each can be set to 12v individually then?
     
  18. Alex9779

    Alex9779 Moderator
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    Yeah, all of those three HE2, FAN0 and FAN1 individually...
     
  19. fpex

    fpex Well-Known Member

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    Nice .... so I can try nd compare fan and redesign! Thanks
     
  20. R Design

    R Design Well-Known Member

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    I think there may be something to be learnt from studying what Dyson has done (see video):

    http://www.dyson.com/air-treatment/cooling-fans.aspx

    1) It may be that an Axial fan is much better at forcing air into a loop (remember how in Alex's Solidworks simulations the BB radial fan created an asymmetric airflow that favoured one side over the other?);

    2) In Dyson's design the air comes out in narrow (high speed) jets in such a way that the fast moving air sucks in air from the rest of the room, multiplying the amount of moving air involved in the cooling process;
     

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