D2 connector

hello, in over two years I use the purse i3, I never have the need to use a fan for the RAMP board and the Mega board, so I never pay much attention to it. Now that I am re-wiring from scratch, for completeness sack, I hooked a 12 V fan directly blows at the boards. When I turned the printer on, the fan doesn't do anything. I am wondering under what condition the fan will come on, when the boards get too hot? If that's the case, where can I set the threshold in pronterface and do I need to do anything in the marlin? Thanks

Edited 1 time(s). Last edit at 03/01/2018 01:54PM by rich1812.

in GCode:

M107 Snnn

Where nnn is a number from 0 to 255 denoting fan speed

M108

This turns the fan back off.

This is usually under gcode control, in order to use full cooling for things like bridges, but allow the fan to be controlled for other situations.

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MBot3D Printer
MakerBot clone Kit from Amazon
Added heated bed.

Leadscrew self-built printer (in progress)
Duet Wifi, Precision Piezo parts

Correction:
It's M106 Sxxx and M107

Thanks for the replies.It works after printing for about abhor, the D2 fan kicks in!

yes, it is indeed M106. At least on my Marlin.

BTW, the tempture graph on the pronterface, UI there are 3 curves, hotted. bed and fan, what does the fan curve for? is it only for display only, since I don't see any button to set the on and off for the fan. Thanks

Edited 2 time(s). Last edit at 03/03/2018 10:10AM by rich1812.

My mistake, apologies, and thanks for the correction.

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MBot3D Printer
MakerBot clone Kit from Amazon
Added heated bed.

Leadscrew self-built printer (in progress)
Duet Wifi, Precision Piezo parts