Auto Home and Power Down after canceled print?

Whitewolf

You can use the stop, pause g code files to first lift the Z then home…..

Here are my files:

; stop.g
; called when M0 (Stop) is run (e.g. when a print from SD card is cancelled)

M208 X-44 Y-18 Z0 S1 	  ; Home outside build area

M83 			; Relative extruder moves
G1 E-10 F3600 		; Retract 10mm of filament

; Return X and Y to home area
G91 			; Relative positioning
G1 Z50 F12000 		; Lift Z by 50mm
G90 			; Absolute positioning
G1 X-40 Y-15 F6000	; go to X=-40 Y=-15

M208 X0 Y0 Z0 S1 	; Restrict movements to build area

You dont have to use the G1 command if you do not want to alternatively you could send X and Y home with this command:

G28 XZ ; Home the X and Z axes

I just use the G1 command so I don't have to wait for the full homing sequence to complete.

; pause.g
; called when a print from SD card is paused

M208 X-44 Y-18 Z0 S1 	; Home outside build area

M83 			; Relative extruder moves
G1 E-10 F3600 		; Retract 10mm of filament

; Return X and Y to home area
G91 			; Relative positioning
G1 Z50 F12000 		; Lift Z by 50mm
G90 			; Absolute positioning
G1 X-40 Y-15 F6000	; go to X=-40 Y=-15

M208 X0 Y0 Z0 S1 	; Restrict movements to build area

dc42

@deckingman:

To auto home after a cancelled print is generally not a good idea as the print head is likely to crash into the (failed) printed part.

It is a good idea on a delta printer.

deckingman

@dc42:

@deckingman:

To auto home after a cancelled print is generally not a good idea as the print head is likely to crash into the (failed) printed part.

It is a good idea on a delta printer.

Ahh… bugger. I keep forgetting about Deltas. Thanks for the correction.

njjn2020

David, which macro is called when print is cancelled ?

dc42

cancel.g is called.

njjn2020

thanks! is there a list of other files that might be of use?

dc42

Yes, https://duet3d.com/wiki/SD_card_folder_structure

c310

i created cancel.g and it does not run when i press emergency stop button on web interface.

and i cannot find 'cancel Print' button on web…

please advise how to link cancel.g to emergency stop or how to add cancel print button to web interface

thanks!

dc42

The Cancel Print button appears after you use the Pause button to pause a print from SD card.

hairy_kiwi

Thanks for all the useful info, but I'm still a little confused after reading up on M0:

https://duet3d.com/wiki/G-code#M0:_Stop_or_Unconditional_stop says M0 H[non_zero_number] is sent by DWC to cancel a print job, keeping the heaters ON:
"M0: The optional 'H' parameter, whose value must be non-zero keeps all heaters active. This is what Duet Web Control sends to cancel a paused print."

Is it a correct assumption that if I have a sys/cancel.g file, that is called instead of DWC simply sending M0 H[non_zero_number]?

BTW, I can see how the default 'heaters remains on after cancelling print' may be useful behaviour for some cancelled print situations, however I'd like to suggest it is a less-safe default state in which to leave a machine after a print job is cancelled - especially for someone new to the hardware. I was recently caught out after cancelling a print, dashing out for an hour only to come back and discover the bed and extruder still hot - far from the safe state I expected it to be in. Would be interested to hear peoples thoughts.

I also discovered a possible bug in that after a print job is cancelled using the cancel button, the Control All > Turn everything off isn't functioning (in RRF v1.18beta2 - sorry I'm running a little behind the releases lately) - instead I need to turn off each heated device in turn.

dc42

When M0 is received the firmware runs cancel.g if a print is currently paused, otherwise stop.g. If the file is missing and there is no nonzero H parameter, it turns off all heaters.

I presume your "Turn everything off" command is a macro. What do you have in the macro file?

hairy_kiwi

Many thanks for the clarification David.

Sorry for the misunderstanding; I don't have a 'turn everything off' macro (am I missing it?) - I was referring to the 'Turn everything off' button in the following screen capture snippet:

Maybe I broke that button's functionality when I hacked DWC to display a larger temperature graph - I don't see how, but it is a possibility.

I've just played again with that button and notice it's completely non-functional (i.e. with and without first cancelling a print) - If I turn all heaters on manually, then click 'Turn everything off', it isn't functioning.

Additionally, I just tried cancelling a print (with bed at set temp, extruder almost at set temp) and restarting the same print only to discover another problem: the extruder temperature is never re-set to printing temperature - the extruder head moves but cold extrusion protection is apparently kicking in to prevent extrusion. This probably needs more testing and verification, but will need to wait a week until I can play again.

dc42

@hairy_kiwi:

Additionally, I just tried cancelling a print (with bed at set temp, extruder almost at set temp) and restarting the same print only to discover another problem: the extruder temperature is never re-set to printing temperature - the extruder head moves but cold extrusion protection is apparently kicking in to prevent extrusion. This probably needs more testing and verification, but will need to wait a week until I can play again.

That would be because you started the new print with no tool selected, and you didn't have a T0 or other tool selection command in your start gcode in the file you printed.