How to cancel loading/unloading of filament?

skezo

tl;dr; The move.extruders[].filament value updates even if the macro fails to complete.

Issue #437 on Github discusses this and it seems the recommended approach is to add a T-1 before any abort command. However, if the user selects "Cancel" after running M291 P"<message>" S3 there does not seem to be away to set the tool to T-1

Would you have to do something like this?

T-1 ; disable tool
M291 P"Feed filament?" S3
T0  ; reset tool

Is setting T-1 still the recommended approach?

Any help on this would be greatly appreciated.

OwenD

@skezo
It would be helpful to know the conditions that cause the macro to fail or require cancellation.
~~However if T-1 stops the filament change in the object model (haven't tested), then you could try something like this (assuming you are running RRF 3.5b)~~

EDIT
I did some testing.
This should cover most scenarios.

;load.g example
; requires RRF 3.5b2 or later
; if no tool is selected, ask the user to select one
; note if filament is loaded from DWC it will default to T0 if no tool is selected, so this won't get run

if state.currentTool = -1
   var toolnumbers = vector(#tools,0)
   while iterations < #tools
      set var.toolnumbers[iterations] = "Tool " ^ iterations
   M291 R"Select Tool" P"A tool must be selected" S4 K{var.toolnumbers} F0
   T{input} ;  use P0 if you want to select tool without running tool change macros

; ask for confirmation before feeding filament
M291 R"Confirm" P"Feed filament?" S4 K{"Yes","Abort change",} F0
if input = 1
   T-1 ;  use P0 if you want to de-select tool without running tool change macros
   M99 ; cancel macro

; do moves to load filament
echo "doing moves for loading filament"

skezo

@OwenD

Thanks! I updated to release 3.5 and this approach seems to work well.
Is there a reason you used M99 over abort?

Edit:
If I understand correctly M99 works better here as it does not cancel the current print file. Whereas abort would.

T3P3Tony

@skezo tracking this github issue here:
https://github.com/Duet3D/RepRapFirmware/issues/437

can you confirm its fixed in 3.5.0beta3?

michele-bertoni created this issue in Duet3D/RepRapFirmware

How to cancel loading/unloading of filament?

closed Abort command in load.g or unload.g filament macros changes filament, as it was correctly loaded/unloaded #437