PWM Fanoutput on Extruder2 Pins?

[bagwan]

Hello Geeetech Support!

I just finished my Prusa i3 Pro B.

Is it Possible to Mount a PWM Fan on the Extruder2 Heater Pins?
In a other Printer i have a Ramps Board, and there is this Option, when i Configure it in the Firmware

Thanks for your Support.

Bernd

[Toy]

There's a PWM fan slot on GT2560 board, didn't you see it?

PWM.png (357.57 KiB) Viewed 7689 times

[bagwan]

Thanks for your reply.
I Seen the PWM Pin an i use it for layercooler.
It would be nice to have another One.
So i could shut Down the BoardCooler an the Extruder cooler after a print.

[bagwan]

So, i have it:
At Power on my Printer is completly quiet. No Fan is running. Only when the Extruder reaches 50degrees the Fan for Hotend an the Board Cooler for the Gt2560 Starts up. After Printing when the Hotend is lower than 50degrees the both Fans stops.

You have to Change only two Parameters in the Code:
Under pins.h: row 1384 (HEATER_1_PIN) Change from 3 to -1. This disables the Funktion Second Extruder Heater.
Under configuration_adv.h: row 78
(EXTRUDER_0_AUTO_FAN_PIN) you must Swap from -1 to 3.
This enables 12V output at the Second Extruder Heater Port when hotend Temp on Extruder 1 is above 50degree.
The Extruder Cooler and Board Cooler must now connected to the Extruder 2 Port. Be sure, that + and - is correct, otherwise the fans not working.