Nozzle can't fall to 60°C

deckingman

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.