Dual extruder fans -- need to replace

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nirfriedman
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Dual extruder fans -- need to replace

Post by nirfriedman » Thu Oct 22, 2015 10:51 pm

Hi,

Mucking around with my M2 dual extruder I manage to break few wings on the 12V fan (the one that sits on the two extruders). And now the 24v seem to have died. Few questions:

1. Where can I get replacement fans? recommended models?

2. The 24v fan -- is it possible that this is a fan problem or a problem on the board? any way to test?

Thanks!

Nir

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Jules
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Re: Dual extruder fans -- need to replace

Post by Jules » Thu Oct 22, 2015 11:43 pm

MakerGear sells the replacements - send an email to support @ makergear.com. Or if you prefer a quieter fan, the Noctua fans are popular with the group. :D

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Tim
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Re: Dual extruder fans -- need to replace

Post by Tim » Fri Oct 23, 2015 1:59 pm

nirfriedman wrote:2. The 24v fan -- is it possible that this is a fan problem or a problem on the board? any way to test?
I would suggest just connecting it directly to a 24V supply to see if it's the fan or the board. There are several possibilities---one is that the fan is just dead; another is the fan is just not responding to the PWM signals and needs a "jump start"---there's an option for this in S3D. The power MOSFET on the board could have died, but fans are, relatively speaking, a lot more fragile than the power MOSFETs.

nirfriedman
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Re: Dual extruder fans -- need to replace

Post by nirfriedman » Fri Oct 23, 2015 7:32 pm

Tim wrote:
nirfriedman wrote:2. The 24v fan -- is it possible that this is a fan problem or a problem on the board? any way to test?
I would suggest just connecting it directly to a 24V supply to see if it's the fan or the board. There are several possibilities---one is that the fan is just dead; another is the fan is just not responding to the PWM signals and needs a "jump start"---there's an option for this in S3D. The power MOSFET on the board could have died, but fans are, relatively speaking, a lot more fragile than the power MOSFETs.
Thanks! I recalled that I have another 24v (from the single-extruder version) and tested it and it works. I found that I managed to pull the wires from the little connector (I was trying to re-adjust the heads and so had to dismantle the fan assembly. Apparently I pulled on the wires :-(

So right now I am connected with the old 24v fan. It has a shorter connection so had to re-route the cable connection.

Regarding the 12V fan. Any model specification?

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innkeeper
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Re: Dual extruder fans -- need to replace

Post by innkeeper » Fri Oct 23, 2015 8:41 pm

are the MG replacement fans ball bearing fans.

i've found the sleaved fans just don't last as long as the Ball Bearing fans.
M2 - MKS SBase w Smoothieware, GLCD, 24v, Upg Z & extruder stepper - IR bed leveling, Astrosyn dampers X/Y/Z, MIC 6, Zebra, PEI, & glass Build Plates - E3D, V3B Hotends, & more - many other 3d printers - production printing.

nirfriedman
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Re: Dual extruder fans -- need to replace

Post by nirfriedman » Sun Nov 01, 2015 8:00 pm

So I got myself some replacement fans. Now I am faced with the question of how to connect them. It seems that the MG connector is not a standard? Any recommendations how to go about this (other than stripping the connector from the old fan and soldering it to the new fan cables?

Also, one of these fans came with three wires (red, black, and yellow). I am not sure what the third (the yellow?) is for.

Thanks!

Nir

jsc
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Re: Dual extruder fans -- need to replace

Post by jsc » Mon Nov 02, 2015 12:46 am

You can get new fan connectors if you know how to crimp pins: viewtopic.php?f=7&t=1493

Third wire is a tachometer wire, for feedback on fan RPM. You can leave it unattached.

nirfriedman
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Re: Dual extruder fans -- need to replace

Post by nirfriedman » Mon Nov 02, 2015 1:05 am

jsc wrote:You can get new fan connectors if you know how to crimp pins: viewtopic.php?f=7&t=1493

Third wire is a tachometer wire, for feedback on fan RPM. You can leave it unattached.
Thanks, never tried to crimp pins.

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insta
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Re: Dual extruder fans -- need to replace

Post by insta » Mon Nov 02, 2015 7:58 pm

Use the red-handled "D-Sub crimper" from RadioShack. It's in the neighborhood of $10, and is not a ratcheting one. It works really well.
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