Options for setup a board fan....

peirof

Hi,

I would like to add a box fan, which is above the drivers. I've read that it's not necessary, but I'd still like to... And I have some questions:

I have the shockets for 2 pin fans occupied, can I connect a 2-wire vent to a 4-pin shocket?
If I can't, what other shock do you recommend? , it sounds to me that in Duet 3 mini there are 2 2-pin shockets.
Duet 3 mini does not monitor the temperature of the plate... So to control that fan I can think of three ideas. Which do you see better:
A - Configure as always on fan
B - Set it as a layer fan, when it reaches a certain layer it will turn on, this system I like but it has the drawback, that if the material does not use layer ventilation, it will not turn on. No
C - Set it as temperature controlled? when the hotend reaches a certain temperature that turns on.... This seems like the best option
D - install a thermistor over drivers, and control these fan with thermistor?

Do you use something similar? How do you have it configured

Thx

Barracuda72

@peirof The 4 pin Fan ports also support 2 wire Fans.( see [https://docs.duet3d.com/Duet3D_hardware/Duet_3_family/Duet_3_Mini_5+_Hardware_Overview]
the cooling pads of the driver are on the backside of the PCB..so best would be if the cooling air comes from the side.
In my Voron i used this solution:

M950 F5 C"out5" Q100				    ; Creates Case Fan 1
M106 P5 T40 L0.4 X0.4 H3                 ; Case Fan 1 Settings (Turns on at 40Â°C tool temp) at low speed
M950 F6 C"out6" Q100				    ; Creates Case Fan 2
M106 P6 T40 L0.4 X0.4 H3                  ; Case Fan 2 Settings (Turns on at 40Â°C tool temp) at low speed

and hooked them up to the MCU Temp
M308 S3 A"MCU" Y"mcu-temp"

Others connected the fans to the hotend tempsensor...so if you start to print it starts to cool the board