Ramp 1.4-Dual Extruder-Heatbed, Plug in Colling Fan?

Hello,

I am currently building my own printer after the model of the ulticampy.
The Box and the machanic parts are already finished.

Now I want to wire the Ramp 1.4:
I want to plug two Extruders, one heatbed and one cooling fan for the printing part like the picture in attach.
So the Problem is, that D8, D9, D10 are occupied with the two Extruders and the heatbed. so I have no possibility to plug in the cooling fan.

The two Extruder fans will be pluged by a fan extender: [www.instructables.com]

Does anyone have the same Problem?

great thanks
Simon

PS: sorry for the bad english :-X

Maybe this can help you:

[vincentm.blogspot.es]

Try with Google translator if you don't understand spanish.

Thanks for the answer.
But I used the Servo Pins with the fan extender for the two Extruder fans. [www.instructables.com]

Basically, it's the same. Pins may vary.
As commented in the intructables page you mention, they are differents versions of the Fan Extender using differents pins, so you must check wich pins are usign the one you bought. (D4, D5, D6 or D11)
Wich pins are using your?
What firmware are you using?

Edited 1 time(s). Last edit at 06/14/2017 12:31PM by VincentM.

I using the Ramp 1.4 with Marlin and bought this fan extender: [www.ebay.de]
So this will used D6/D11. I have to look to found the sam wich will use D4/D5. Any idea?
#thanks a lot

Edited 1 time(s). Last edit at 06/15/2017 02:37AM by SimonL.

OK

In "Configuration.h" file of Marlin, declare your board as:

#define MOTHERBOARD BOARD_RAMPS_14_EEB

In "pins_RAMPS.h" file, change this line: [github.com]

from:

#define FAN_PIN 4

to:

#define FAN_PIN 6

Compile & upload Marlin.

Conect your layer fan to pin 6 of the Fan Extender. That's all.

This fan will work as normal layer fan (M106 & M107)

I built myself a simple single transistor 'switch for D4 D5 & D6. Your fan extender only uses two of the four pins it sits on.. it looks D5 and D11, You could use the following circuit to make switches for all four pins (D4, D5, D6 & D11) if you wanted to..but that is 'old school'.. the stepper module in the previous post does the same job and it is ready made for you!!

Why do you have the extruder fans plugged into the fan extender? You should just run 12v straight from the power supply to the extruder fans, then use the fan controller for the part cooling fan. The part cooling fan needs to be controlled, but it's fine if the extruder fans are on all of the time.