Nozzle can't fall to 60°C

deckingman

@jul The best way to do it is simply enable thermostatic mode, then you don't need any commands to the gcode file. Assuming fan 1 is the fan you want to control and you want it to switch with haete 1 which is the normal hot end heater, then use this in your config.g instead of what you have now.

M106 P1 S0.8 I0 F500 H1 T60

For a more detailed explanation look here https://duet3d.dozuki.com/Wiki/GCode#Section_M106_Fan_On

adavidm

@jul said in Nozzle can't fall to 60°C:

M109 R60

From the Wiki:

M109: Set Extruder Temperature and Wait

You are telling the Duet to set the temperature to 60 degrees and then do nothing, which sounds like exactly what is happening.

You probably want Thermostatic fan control, part of M106

Looking at your config, you have this option disabled with H-1:
M106 P1 S0.8 I0 F500 H-1 ; extruder fan

as an example, try:
M106 P1 S0.8 I0 F500 H1 T60

and put

M104 S0

in your end gcode. When the temperature drops below 60C, the fan should switch off.

adavidm

JuL

Thanks for helping, but I'm using this on P0 (nozzle) wich I can't use thermostaticaly.
P1 (extruder) is always on and could be in thermostatic mode, but is not noisy

adavidm

I don't understand what you are trying to do. If you don't want to use thermostatic control what about:

M109 R40 ; To get the temperature below your threshold
M106 P0 S0; To switch P0 off.

Does that help? Sorry if i'm not understanding your use case.

JuL

The problem is that it wil never arrive at 40°C (as at 60°C). It will go around but upper than 40°C (like 42-43°C) so M106 P0 S0 will never be done.

Basically, I've got:

P0 wich blow on my nozzle,
P1 on the E3D heatsink
P2 on motherboard.

What I want to do at the end of a print is:

Have P1 (e3d heatsink) blowing permanently at 80% (works)
Have P0 (nozzle) keeping blow on the nozzle until it reach 60°C
Have P2 (motherboard) blowing permanently at 70% (works)

PS: my english is maybe poor, so don't hesitate to ask again if it's not clear

tjb1

@jul said in Nozzle can't fall to 60°C:

Thanks for helping, but I'm using this on P0 (nozzle) wich I can't use thermostaticaly.
P1 (extruder) is always on and could be in thermostatic mode, but is not noisy

Why can you not use thermostatic mode on P0? I don't see anything in the documentation other than they recommend it on P1 due to it being activated on Duet restart by default.

Are you using it to cool the print and don't want it running all the time?

JuL

@tjb1 said in Nozzle can't fall to 60°C:

Are you using it to cool the print and don't want it running all the time?

Exactly

tjb1

@jul said in Nozzle can't fall to 60°C:

@tjb1 said in Nozzle can't fall to 60°C:

Are you using it to cool the print and don't want it running all the time?

Exactly

Try turning thermostatic off in the start g-code of your slicer using M106 P0 S0.0 I0 F500 H-1 which should allow it to be controlled like a normal print fan and then in the ending g-code when you want the fan to stay on until 60C turn it into a thermostatic fan with M106 P0 S0.0 I0 F500 H1 T60

JuL

@tjb1 Idon't want to modify P1, it works well.
I want P0 to wait until the cold temperature is achieved.
I did that before with Marlin firmware on ramps, and it worked a charmed.
With Marlin, I did M104 S0 followed by M109 R60 and it didn't regulate, just wait as hotend were stop.
The duet firmware doesn't seem to work that way with M109 R60, it regulate

deckingman

@jul said in Nozzle can't fall to 60°C:

The problem is that it wil never arrive at 40°C (as at 60°C). It will go around but upper than 40°C (like 42-43°C) so M106 P0 S0 will never be done.

Basically, I've got:

P0 wich blow on my nozzle,
P1 on the E3D heatsink
P2 on motherboard.

What I want to do at the end of a print is:

Have P1 (e3d heatsink) blowing permanently at 80% (works)
Have P0 (nozzle) keeping blow on the nozzle until it reach 60°C
Have P2 (motherboard) blowing permanently at 70% (works)

PS: my english is maybe poor, so don't hesitate to ask again if it's not clear

That's no problem. You can set any fan to monitor any heater.

So M106 P0 H1 T60 will use fan 0 monitoring heater1 (which is the hot end) and turn on at 60 deg C.
Then M106 P1 H1 T80 will use fan 1 but also monitoring heater1 and turning it on when it reaches 80 deg C.

I haven't tried it but it should work.

tjb1

@jul said in Nozzle can't fall to 60°C:

@tjb1 Idon't want to modify P1, it works well.
I want P0 to wait until the cold temperature is achieved.
I did that before with Marlin firmware on ramps, and it worked a charmed.
With Marlin, I did M104 S0 followed by M109 R60 and it didn't regulate, just wait as hotend were stop.
The duet firmware doesn't seem to work that way with M109 R60, it regulate

I'm sorry, I didn't edit the commands to reflect the correct pin. Change the P1 to P0. If you use the command to change P0 to a thermostatically controlled fan at the end of the print, it will leave the fan on until it reaches 60C and then shut the fan off but it's not a blocking code and the g-code will terminate.

JuL

Just for be clear:
P0 (wich I want to wait until asked temperature) is the fan wich blow on my print, so I want to manage speed on the slicer, not themostatic.
But I can maybe put your command in my slicer's end script after M104 S0 ?

tjb1

@jul said in Nozzle can't fall to 60°C:

Just for be clear:
P0 (wich I want to wait until asked temperature) is the fan wich blow on my print, so I want to manage speed on the slicer, not themostatic.
But I can maybe put your command in my slicer's end script after M104 S0 ?

Yes if you place M106 P0 S0.0 I0 F500 H-1 in the starting g-code (this is needed in the starting g-code to reset the fan to g-code control if you don't reset Duet between prints) it should allow that fan to be controlled with g-code like a normal print fan then when you reach the end (ending g-code) you should be able to place M106 P0 S0.0 I0 F500 H1 T60 and the fan will stay on until 60C is reached.

JuL

ok for my fan, I will give it a try.
Is there a way to do something when the fan shutdown? I want my printer to blow until 60°C is reached then turn the printer off

tjb1

@jul said in Nozzle can't fall to 60°C:

ok for my fan, I will give it a try.
Is there a way to do something when the fan shutdown? I want my printer to blow until 60°C is reached then turn the printer off

You can use M81 S1 per https://duet3d.dozuki.com/Wiki/GCode#Section_M81_ATX_Power_Off or if you aren't using M81 I assume something like the following would work as well?

M106 P0 S0.0 I0 F500 H1 T60 ;Change fan P0 to thermostatic control with 60C target
G10 P0 R60 S60 ;Set tool 0 to 60C Standby/Active temperature
M116 ;Wait for temperature
G10 P0 R0 S0 ;Set tool 0 heaters off - needs confirmed
*Command to shutdown here*

JuL

M106 P0 S1.0 L1.0 I0 F500 H1 T60 works well for keeping my fan alive until temperature reached
Thx
As I don't already have my relay, I can't test the M81 command. I'll test as soon as I can

Phaedrux

I think you may have found what you needed already, but here's what I do at the end of my prints to cool the nozzle and the print with the part cooling fan.

; stop.g
; called when M0 (Stop) is run (e.g. when a print from SD card is cancelled)
; Also called by slicer end gcode by M0
;
M400			; Finish move queue
M104 S0 		; Extruder heater off
M140 S0 		; Bed heater off
M106 S255 		; Fan at 100 to cool nozzle and bed
G91			; Relative positioning
M220 S100		; Set speed factor back to 100% in case it was changed
M221 S100		; Set extrusion factor back to 100% in case it was changed
G1 E-2			; Retract filament 2mm
G1 X5 Y5		; Wipe nozzle 
G1 Z5			; raise nozzle 5mm from printed part
G90			; Absolute positioning
M104 S35		; Set hot end low and wait
G4 S300			; Wait 5 minutes
M116			; wait for temp to drop
M106 S0			; Fan off
M104 S0			; extruder heater off
M140 S0 		; Bed heater off
G28 X Y			; Home X and Y
G28 X Y			; Home it again, Sam.
M290 R0 S0		; clear babystepping
M84			; Steppers off
M98 P"ZSpeedsNormal.g"	; Load normal z speed settings again.

tjb1

@jul said in Nozzle can't fall to 60°C:

M106 P0 S1.0 L1.0 I0 F500 H1 T60 works well for keeping my fan alive until temperature reached
Thx
As I don't already have my relay, I can't test the M81 command. I'll test as soon as I can

Why do you have the G4 S300 and M116?

Phaedrux

@tjb1 because I want to wait at least 5 minutes with the fan on to cool the part and bed. Depending on the print temp the hotend may have cooled off by then or not.