Passing Parameters - unknown variable

phoenix

Hello, I am trying to create a filament load macro, that gets called by the respective filament load button, or if called manually (which hotend was pressed is unknown) asks for which hotend to work with.

I can't crack one final step - when running the macro (triggered, or called manually), I get an error: when triggered by the button it returns
Error: in file macro line 4 column 23: meta command: unknown variable 'hotendselect'

The sequence is first that the button triggers the trigger5.g file to pass on the value "2" :

; trigger5.g
M98 P"0:/macros/filament-load" X2   ; Load Filament for T2

then, the error is in Line 4 of the filament-load macro:

;Autoload filament macro. Press button then insert filament to load
if exists(param.X)
  ; Parameter X was passed
  set var.hotendselect = param.X
  echo "Autoload for Extruder " ^ var.hotendselect
  else
  ; Parameter X was NOT passed, display screen for selecting one of the hotends
  M291 R"Unload Filament" P"Request for Extruder #" S4 K{0,1,2,3} J1
  set var.hotendselect = {input}
endif

T{var.hotendselect}                       ; Select Tool as passed on
M300 S2000 P100   				              	; play beep sound
M291 P"Insert filament in Tool!" S0 T3   	; display message
M302 P1   	        				            	; enable cold extrusion
G4 S5 						                      	; wait for 5 seconds to insert filament
G1 E15 F500  				                   		; load filament inside the gears
M109 S235 T0 					        	          ; set hotend temperature and wait
G1 E100 F300 				          	        	; extrude 100mm, you may need to reduce speed for very soft TPU
M104 S0 T0 					                    	; set hotend temperature to 0
M302 P0 					                      	; disable cold extrusion
M291 P"Filament autoload complete!" S0 T3 ; display message

unset var.hotendselect                    ; Erase variable

Apologies with what I assume is a noob question - I tried search, the GCode manual and chatGPT to no avail...

jay_s_uk

@phoenix hotendselect will only be available inside the if. If you want it available in the rest of the macro declare it at the top before the if

Endif also isn't valid

And unset also isn't valid

fcwilt

@phoenix

Before you can user a variable in the form var.some_name you have to declare it using the form var some_name = 0, or whatever initial value you want it to have. Notice there is not period character between var and some_name in the declaration.

Frederick

phoenix

@fcwilt @jay_s_uk thanks for your help! I have now my first macros running

fcwilt

@phoenix

That's why we are here!

If we cannot help, we can mess things up in style.

Frederick