advice for connecting bambu large part cooling fan to railcore
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I was hoping I could get some advice on this.. I bought the large part cooling fan that is mounted on the side of the bambu x1 and was going to try and use it on my railcore 300zl. I have a standard setup with a duet2 wifi and the duet5x expansion board. 24v power supply.
The fan itself has a 4-pin jst (I think?) connector with black, dark gray light gray, and white wires. It has a sticker stating it's a 24v 0.5a fan. It has a model number but google searches didn't yield much info so far. I'm sure it's variable speed.
So, what would be the best way to connect this on my setup? Seems like these fans would be an easy way for lots of different printers to add extra part cooling, as they are cheap and come in a pretty good form factor with double sided tape already on and everything ready to go.
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this?
https://us.store.bambulab.com/products/hotend-cooling-fan
$30 is cheap?
Anyway.. you need the pinout of the fan, this could be ascertained from someone that has a Bambu printer and measures the pins on the fan header for you.
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@elmoret Well I mean thirty bucks for something that's basically plug and play if you can make the plug isn't crazy town. I spent a lot more on the railcore kit
Anyway I found this documentation for anyone else wanting to experiment with this:
https://railcore.org/customization/12v_fans.html
I'm guessing, unless bambu was particularly sadistic with their choice of wire colors, that I hook up the white wire to 24v, black to ground, and then dealers choice on which of the grey wires is speed control and tachometer. Seems like I hook the speed control to a fan0/fan1/fan2 ground port and set frequency to 25k to control it.
When I get the chance to rig up some connections I'll post what I find or what blows up for future reference.
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@skrotz They were sadistic. Black = 24v, Dark grey = ground, light grey = tach, and white = pwm control. PWM needs to be inverted. Hooking up 24v and ground to an always on fan port and control to fan2 ground works fine. It puts out a ton of air, but the shroud spreads it out less than I expected.
I haven't confirmed tach as working but seems likely it would, although I'm not sure it's useful.
