Fan not working on Prusa i3 with ramps 1.4 Hey guys, I'm running my printer with the ramps 1.4m, using slic3r through repetier-host V1.0.6 and I have wired up my fan (40mm 12v) to D9 on the boardbut it's not working at all. Doesn't start when activated on Slic3r and doesn't start when printing or bridging. Some help with this would be greatly appreciated, thank you! Some photos: [attachment 45670 IMG_7236.JPG] [attachment 45671 IMG_7240.JPG] [attachment 45669 slicer.png] Here's a clip from my code (configuration h.) #define NUM_EXTRUDER 1 #define MOTHERBOARD 33 #include "pins.h" // ################## EDIT THESE SETTINGS MANUALLY ################ // ################ END MANUAL SETTINGS ########################## #define FAN_PIN HEATER_2_PIN #define FAN_BOARD_PIN -1 Kind regards, Luke https://reprap.org/forum/read.php?1,446749,446749#msg-446749 Wed, 15 Jul 2026 09:51:00 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,446749,447132#msg-447132 Re: Fan not working on Prusa i3 with ramps 1.4 https://reprap.org/forum/read.php?1,446749,447132#msg-447132
Quote
Govahnator
I am having the same issue, i just installed my new e3d v6 hot end and i cant get the fan running

You are both having two separate issues. The e3d fan that connects to the hot end itself should be on all the time. There is a dedicated pair of pins just below the first stepper driver above the two big fuse things.

For the fan attached to D9, download Repetier (as I can't remember how to do it in pronterface) and use the slider I've highlighted below when connected to the printer. The fan should come on at anywhere between 0 and 50pc along the slider.

If it doesn't, few things to try,
With a multimeter check you've got voltage coming out of D9
Try reversing the wires on the fan
After that it's going to be a look in Marlin. YOu need to find the section in pins.h related to motherboard 33 and in that section (and only in that section look for the fan_pin setting. Should be 9.

This is what mine says.
  #if MOTHERBOARD == 33 || MOTHERBOARD == 35 || MOTHERBOARD == 67 || MOTHERBOARD == 68
    #define FAN_PIN            9 // (Sprinter config)
]]> UkIan General Tue, 23 Dec 2014 18:33:37 -0500 https://reprap.org/forum/read.php?1,446749,447015#msg-447015 Re: Fan not working on Prusa i3 with ramps 1.4 https://reprap.org/forum/read.php?1,446749,447015#msg-447015 Govahnator General Tue, 23 Dec 2014 13:15:15 -0500 https://reprap.org/forum/read.php?1,446749,446749#msg-446749 Fan not working on Prusa i3 with ramps 1.4 https://reprap.org/forum/read.php?1,446749,446749#msg-446749
I'm running my printer with the ramps 1.4m, using slic3r through repetier-host V1.0.6 and I have wired up my fan (40mm 12v) to D9 on the boardbut it's not working at all. Doesn't start when activated on Slic3r and doesn't start when printing or bridging. Some help with this would be greatly appreciated, thank you!

Some photos:

[attachment 45670 IMG_7236.JPG]
[attachment 45671 IMG_7240.JPG]
[attachment 45669 slicer.png]



Here's a clip from my code (configuration h.)

#define NUM_EXTRUDER 1
#define MOTHERBOARD 33

#include "pins.h"

// ################## EDIT THESE SETTINGS MANUALLY ################
// ################ END MANUAL SETTINGS ##########################

#define FAN_PIN HEATER_2_PIN
#define FAN_BOARD_PIN -1

Kind regards,
Luke]]> Giveitall1 General Mon, 22 Dec 2014 20:44:24 -0500