Unnecessary preheat of T0 if only T1 is used

[drake7707]

Is there an existing issue for this problem?

• I have searched the existing issues

OrcaSlicer Version

2.2.0

Operating System (OS)

Windows

OS Version

Windows 11

Additional system information

No response

Printer

Voron 2.4 with toolchanger

How to reproduce

Add an object, select it to print on the 2nd filament (T1), generate gcode.

There will still be M104 S280 T0 ; preheat T0 time: 60s lines even though T0 is not used.

T0 is not even emitted to PRINT_START: PRINT_START TOOL_TEMP=280 T1_TEMP=280 T1_IDLE_TEMP=150 BED_TEMP=105 TOOL=1 CHAMBER_TEMP=0 FILAMENT=ABS

Actual results

T0 gets heated to print temp even though it isn't used

Expected results

T0 should not be preheated when it's never used

Project file & Debug log uploads

Stealthburner_face_T1.zip
debug_Thu_Dec_26_11_36_45_13700.log.zip

Checklist of files to include

• Log file
• Project file

Anything else?

No response

[drake7707]

Seems to be because of TIMELAPSE_TAKE_FRAME in the before layer change gcode. The postprocessor sees a line starting with a T and then parses the rest of the string with a cast to 0, so it thinks T0 is called every layer change.