Hmm the default UM2 fan setup has 2x 12 Volt fans in series on 24V power if I'm correct .... you say this is an issue ?
Our do you mean it's only an issue to do this 2x ? (doubling the power use)
I'm also planning on adding a extra 5V hot-end-isolator fan in parallel to the existing 5v fan, doubling the power use .. would like some confirmation this is ok ....
Alternative is to power the side fans and hot end isolator fans of the 2th head separately, but this would be a lot less practical....
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zoev89 73
I would be careful putting 2 12V fans in series on a 24V source. If one fan is spinning up later the other gets the full 24V. Or for example a finger is in the way the other fan might dye and if your transistor on the board survives the event.....
You will be running those fans also at low rpm where you can easily get into unbalances. You could add zeners in parallel on the fans but you don't have much headroom to play with.
I would personally not do that get 24V fans or modify your design so they can run on 12V. Putting 12V fans in parallel on a 12V source is fine.
If you can repair your ultimaker pcb easily then feel free to experiment but if not then don't take the risk. I didn't want to risk my ultimaker board so I added additional transistors to run all my fans at 12V on a 12V source. And I made a 12V out of my 24V power supply.
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