Adding Extruder Fan to Always RUn

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Adding Extruder Fan to Always RUn

Postby MileHigh3DII » 2017-May-Tue-04-May

I flipped my PB+ Dual Fans around to the top to cool the extruders. I find if I need it to keep them from not getting too hot and bending and pigtailing filament. That was fine for simple parts in ABS, but I'm looking at PETG and PLA and more parts with bridging and overhangs where I could use the fan.

The extruders need air pretty much constantly. I pulled two fans out of an old PC housing

DC12V 1.7W (Bigger)Yellow-Red-Black
DC 12V 0.7A (smaller) White-red-black

All three are set up with connectors on them.

I am completely dumb on electronics. Physical and chemical I can deal with, electrons; no. Like I don't know why there are three wires instead of two.

I have a 400 ATX power supply. I assume I can use one of those connectors to power the fan?

I'm thinking the smaller one; it will be easier to make a housing/attachment for it.

How do I wire this smaller fan up? ELI5
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Adding Extruder Fan to Always RUn

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Re: Adding Extruder Fan to Always RUn

Postby Mooselake » 2017-May-Tue-06-May

The third wire is a speed sensor output and can be ignored. Google computer case fan pinout. You can also find 2 to 3 wire adapter extension cables

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Re: Adding Extruder Fan to Always RUn

Postby MileHigh3DII » 2017-May-Tue-12-May

Kirk- you have too much faith in me. So I know what the wires do at least. I'm guessing there is an adaptor that will let me plug it into the one of the unused power connectors from the power supply?

Would something like this:

https://www.newegg.com/Product/Product. ... -_-Product

Do what I want?
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Re: Adding Extruder Fan to Always RUn

Postby Mooselake » 2017-May-Tue-19-May

Looks like it. I've used them to put too many fans in computer cases (somewhere here is a picture of a 200mm case fan, sitting on the same size heated bed, that's probably plugged into one of those). They're popcorn parts, sold all over. Good choice

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Re: Adding Extruder Fan to Always RUn

Postby MileHigh3DII » 2017-Jun-Wed-00-Jun

Thanks for the help. If I wanted to add a switch. Which wire would I add one to? Got a the adaptor and added some extensions. Printed a bracket to place it in front of the extruders.
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Re: Adding Extruder Fan to Always RUn

Postby Mooselake » 2017-Jun-Wed-07-Jun

In the 4 wire cable either +12, (yellow), or ground (black) would work. The +5 red wire isn't used.

Either of the two power wires in the fan cable would work too. Google the wire cable pinout, don't know that one off the top of my head

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