Controlling 2 fans with ramps 1.4 marlin ans motherboard 35

Re: Controlling 2 fans with ramps 1.4 marlin ans motherboard 35

alexgibson3d — Sun, 11 Oct 2015 09:03:37 -0400

Hi, thanks Salsabettis I found this extremely helpful.

Re: Controlling 2 fans with ramps 1.4 marlin ans motherboard 35

victorjung — Thu, 12 Feb 2015 03:49:35 -0500

That's even more perfect! thank you so much salsabettis!

Re: Controlling 2 fans with ramps 1.4 marlin ans motherboard 35

salsabettis — Thu, 05 Feb 2015 13:11:14 -0500

This feature is built into Marlin already. You just need to set the extruder fan pin number, threshold temperature and PWM value (0-255). This way you don't have any GCODE modifications to turn on this fan. Uklan is correct, you don't want to shut off the fan immediately after a print stops. This feature allows your hot end to properly cool before turning off the fan to avoid heat creep.

See Configuration_adv.h. The example below will turn on the fan attached to Pin 9 (100%) when the hot end temperature is above 50C.

// Extruder cooling fans
// Configure fan pin outputs to automatically turn on/off when the associated
// extruder temperature is above/below EXTRUDER_AUTO_FAN_TEMPERATURE.
// Multiple extruders can be assigned to the same pin in which case
// the fan will turn on when any selected extruder is above the threshold.
#define EXTRUDER_0_AUTO_FAN_PIN 9
#define EXTRUDER_1_AUTO_FAN_PIN -1
#define EXTRUDER_2_AUTO_FAN_PIN -1
#define EXTRUDER_3_AUTO_FAN_PIN -1
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed

Re: Controlling 2 fans with ramps 1.4 marlin ans motherboard 35

UkIan — Thu, 05 Feb 2015 08:04:57 -0500

Quote
victorjung
Yeah, but i would like to shutdown the hot end fan at the end of the print...even if the 12 is still on.I tried M42 which seems a nice option for me, but it doesnt do anything, the pin 10 i am trying to control stay at zero withs M42 P10 S255
Any ideas why?
thanks for your help anyway ;)

Don't do that. The hot end will still be hot and you don't want the heat to travel up the hot end. There's a slight risk the extra heat could damage a printed part further up, but the biggest risk is the heat will breach the heat break. If you're using PLA that will cause blockages.

Re: Controlling 2 fans with ramps 1.4 marlin ans motherboard 35

victorjung — Thu, 05 Feb 2015 03:14:30 -0500

mother board 35 is extruder plus 2 fans, but the extruder is on pin 8, and 9 & 10 are for fans.

Re: Controlling 2 fans with ramps 1.4 marlin ans motherboard 35

plankton — Wed, 04 Feb 2015 20:03:57 -0500

I don't have Marlin available to check right now, but isn't motherboard 35 an extruder and 2 fans, so I assume it expects pin 10 to be the Extruder the same as motherboard 33, with fans on 8 & 9.

Re: Controlling 2 fans with ramps 1.4 marlin ans motherboard 35

victorjung — Wed, 04 Feb 2015 08:39:29 -0500

Yeah, but i would like to shutdown the hot end fan at the end of the print...even if the 12 is still on.I tried M42 which seems a nice option for me, but it doesnt do anything, the pin 10 i am trying to control stay at zero withs M42 P10 S255
Any ideas why?
thanks for your help anyway ;)

Re: Controlling 2 fans with ramps 1.4 marlin ans motherboard 35

plankton — Wed, 04 Feb 2015 07:19:54 -0500

A hotend fan could just be connected to 12v (as you want it on all the time you're printing), but if you want to control it try M42

Controlling 2 fans with ramps 1.4 marlin ans motherboard 35

victorjung — Wed, 04 Feb 2015 06:13:52 -0500

Hi, reprapers,
I Have 2 fans one for cooling down the hotend, and one to cool down the print whent printing overhang.
I configured marlin to set my ramps 1.4 as motherboard 35 which should allowed to control 2 fans.
One is plugged in d10, the other is plugged in d9, but when using M106 S255 command only the one plugged in d09 starts...
I guess there is a specific command for the one in d10 but with one???
Thanks for the help guys,
Victor