Fan shroud upgrade

[Neotko]

19v on a 12v fan. Too much love can kill XD

[Neotko]

Btw you guys know I have zero electrical knowledge but I saw a post somewhere that you could make something to down the v from 19 to 12 (and add a dioder) so you can safely use a 12v fan on the umo.

[Neotko]

Here this post. A zener dioder
https://ultimaker.com/en/community/1024 ... eply-90448

[Amedee]

I guess it was with a Zener Diode.

Short answer: don't do that, they are not made for that.If you want to do that, use a proper 'step down' voltage regulator.

[LePaul]

Yes but on my Ultimaker Original...again, not a plus, I shouldn't have to adjust anything.

Just need help picking the right 50x50x15 12v fan

[Dim3nsioneer]

LePaul, I can feel your misery... I'm in exactly the same position but for 30x30mm fans... thought of trying some Delta fans as well... but honestly, one might kill them instantly...

Kill instantly? How so?

Not every fan is fine with a 11kHz(?) PWM Signal. Imagine someone shaking you 11'000 times per second...

[Neotko]

No Lepaul, ultimaker original not plus uses 19V for the fans, but ultimaker uses 12v fans that 'work'. So unless you get a second exact fan, you will need to do stuff (I think).

[Dim3nsioneer]

I just checked the number on the original UM2 fans. It says DF0301012BM-501. Apart from the small probability the last three digits are a tribute to Darth Vader's 501st legion (sorry, I couldn't resist after knowing that LePaul has friends who are working on STAR WARS ) the first two letters are interesting. DF = Delta Fan?
If that would be true, then Delta Fans should be our New Hope!

[LePaul]

I just checked the number on the original UM2 fans. It says DF0301012BM-501. Apart from the small probability the last three digits are a tribute to Darth Vader's 501st legion (sorry, I couldn't resist after knowing that LePaul has friends who are working on STAR WARS ) the first two letters are interesting. DF = Delta Fan?
If that would be true, then Delta Fans should be our New Hope!

Here's the search I did...perhaps it will be helpful? http://www.mouser.com/Thermal-Managemen ... x2Z1yww2yq

(Just uncheck the 50mm box in the top left)

[Amedee]

Re. the PWM vs Voltage thing, I made a quick (and boring) video to illustrate my point...

[LePaul]

Amedee still hoping you suggest a fan for me to order!

[Amedee]

Yes, I understand, but I am struggling with that.

The UMO case is challenging, because you need a 12V fan that won't fry at 19V and does PWM. You won't find that in the specs, no manufacturer will guarantee that their 12V fan will happily take 19V. I guess we need a fan with no advanced electronics, so over-voltage won't be an issue and PWM typically works with 'simple motors'.

Best bet is to find somebody who as one and take the specs -- I spent quite some time yesterday to find back an old forum post about that, with no success.
If you want something that works, order an Ulimaker fan (e.g. from fbrc8) -- More expensive, but guaranteed to work; if my UMO fan would die that's what I would do.

Now for a dual fan project I would rather look at 24V fans to be 'in spec' re. voltage... But that would be trial and error, so I don't want to recommend something I have not tried myself.

[Neotko]

And what about a stepup from 19v to 24v? This way you could use the easy-to-find sunon 50x50x10 umo+ fan on your umo. It's easy to do a stepup?

[LePaul]

None of the support places I've seen stock UMO fans. Just UMO+ on up

[Neotko]

With the partnumber from github you can order a part, but since they ask to ultimaker and go back it might take a good couple of months, unless you pay more and get a full 'fan pack' for umo