Free pins on Ramps 1.4

Hello!

I am trying to do a Dual nozzle with heated bed and print Cooling fan.
For This i need to add anløber mosfet (i guess).
I have Been going over the schematics for the Ramps, but i am a bit confused, which pins are free? And which of Them are PWM?
Can annonce help me?

You can either wire the print fan into the power input, leaving the fan on all the time, or you could purchase a fan extender and remap the print fan to pins 4 or 5 if you still want to control the fan. You should then be able to use two extruders and a heated bed without any further changes to RAMPS.

Wont i be alle to access onde of the free pins and connect a mosfet there?

Do you have a link of such a fan extender? I Would like to be alle to control the fan

I assume the servo pins are pwm. I haven't looked into it, but it seemed like an attractive place to connect an extra mosfet for some electronics cooling fans that I was thinking of adding.

Quote
Kafledelius
Wont i be able to access one of the free pins and connect a mosfet there?

Do you have a link of such a fan extender? I Would like to be able to control the fan

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Not sure if this is where I bought mine or if I got it cheaper off of eBay. Using a different motherboard type in your firmware (33 might be default for RAMPS with a hotend, fan, and heated bed) will change the pins.h location of your print fan, probably to -1 in order to disable it. Using the fan extender, I believe you can change the pin to either 4 or 5 and still be able to control it through software / slicer settings.

Now that I think about it though, you will need to solder header pins to the 12V holes to the left of your X stepper driver (with the power inputs facing to the left), then use a wire included in the kit to power the fans.