In Marlin there is board config option for BOARD_RAMPS_14_EFF which is for hotend, fan0,

3D Printing
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In Marlin there is board config option for BOARD_RAMPS_14_EFF which is for hotend, fan0, fan1. What is the gcode to control the fan1 in this configuration? And what pins would I connect the fan1 to?

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The pins you get from the pins.h
Should be the coldend-fan (turns on on a specific temperature of the hot end…). Dont know why somebody should use it. Just let it run ^^

Edit: should be the second and third mosfet?

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Been awhile since I worked with RAMPS, but as @VolksTrieb mentioned, it should just be the second and third mosfet since you are not installing a heated bed or second hot end. So assume pin 9 is the hotend, 10 is fan 0, and 11 is fan 1 if I recall correctly.

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It’s running too FAST and the extruder is having trouble getting up to temperature. Also, I’d like it to turn OFF when I’m actively printing as it is too NOISY.

I’m using the option in the Configuration_adv.h and set #define EXTRUDER_0_AUTO_FAN_PIN 8 and set the fan speed to 175 to slow the fan down.

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All depends on your setup and printer type.

The default fan, going to say fan 0, is intended as a part cooling fan and should be pointed at the tip of the hotend, primarily cooling the part you are printing. This is controlled throug the GCode generated by your slicer. You usually don’t want it turned on for the first layer or two of your printer, and if it is cooling your hotend, you have it pointed to high.

The second type of fan cools the fins on an all-metal hot end, preventing heat creep that would cause your filament to expand outside of the molten plastic zone, leading to filament jams. Realistically, this fan should be on at full blast whenever your hotend is above 30-50 degrees. A lot of people just wire it to the 12V power supply so that it is always on when the power is on. Turning it off is a bad thing.

The final type of fans I am aware of are meant to cool the driver boards on your RAMPS. Honestly, unless you have them covered, they shouldn’t be getting hot enough to need active cooling. But if they do, you again want the fan always on while printing.

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Just FYI, my previous comment was to indicate I already got it working. But thanks.