Fan0 issues, only responds to m106 when NOT printing

Phaedrux

Can you share a sample gcode?

deckingman

@stavrosgmtl You say the fan stopped working. Can you confirm that it used to work and that it stopped working without you making any changes to the configuration? If that is the case, then we need to concentrate on the actual gcode that you are printing or something other than a configuration issue. One other possibility is that you have an intermittent bad connection such as a poor crimp which makes or breaks as the print head moves around. So sometimes it responds to an M106 and at other times it does not.

stavrosgmtl

@Phaedrux m106 works perfectly, except when printing. So before starting a print, m106 works, after a print ends, it works. The identical m106 commands in the gcode are ignored.

So i tested the fan on one of the always on ports, it worked perfectly. I swapped fans, no change.
I tried different duet boards as well. no change.

I did some calibration tweaks to my config recently as I switched to rails, and upgraded to 3.44. I checked the profile gcode vs code that worked in the past. I didn't see anything there.

I downgraded to 3.4, and no change.

So to your point, I think I've narrowed it down to to config or firmware.

I 'll create some small sample gcode now for a 2 layer cube, and get back to everyone.

Karim

@stavrosgmtl This works for me, I am using prusa slicer 2.5.


; Fans
M950 F0 C"fan0" Q500                               ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                     ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                               ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45                                  ; set fan 1 value. Thermostatic control is turned on

Phaedrux

@stavrosgmtl said in Fan0 issues, only responds to m106 when NOT printing:

So to your point, I think I've narrowed it down to to config or firmware.

It's possible there is an intermittent break in the wiring that only comes into effect when the print head is moving during a print?

stavrosgmtl

@Phaedrux not a bad idea to inspect wiring. Ill do that next.

stavrosgmtl

fans tested wiring is perfect, replaced anyway, same thing.

Phaedrux

You can send M950 F0 and M106 P0 by themselves during a print to see what the firmware reports back as their current values.

Then try sending the M106 P0 S1 fan command manually during a print.

dc42

@stavrosgmtl perhaps something is wrong with the tool fan mapping. Please send T-1 and then test whether you can control the fan using M106 S0 and M106 S1. Then send T0 and test the fan again.

stavrosgmtl

@dc42 @Phaedrux I appreciate the help, I rewired the whip and voila it worked. Thank you everyone for your time. I should have rewired it from the start, the config is NOT that hard!

Cheers