Question regarding !filament_names!

[tom-lp-at]

I have
MMU_START_SETUP INITIAL_TOOL={initial_tool} REFERENCED_TOOLS=!referenced_tools! TOOL_COLORS=!colors! TOOL_TEMPS=!temperatures! TOOL_MATERIALS=!materials! FILAMENT_NAMES=!filament_names! PURGE_VOLUMES=!purge_volumes!
in my Start-machine-GCode.

If i upload the sliced GCode, the following Error comes up in Klipper:
Malformed command 'MMU_START_SETUP INITIAL_TOOL=0 REFERENCED_TOOLS=0,1,2,3 TOOL_COLORS=FFFFFF,0100FF,000000,FFBD00 TOOL_TEMPS=245,240,245,240 TOOL_MATERIALS=PETG,PETG,PETG,PETG FILAMENT_NAMES="Mercury Devil PETG - MMU Weiss - Kupfer","Mercury Devil Design - PETG - MMU - Blau #21","Mercury Devil PETG - MMU SW - Kupfer #29","Mercury Devil Design - PETG- MMU - Orange #42" PURGE_VOLUMES=0.0,150.0,80.0,241.0,250.0,0.0,80.0,591.0,560.0,308.0,0.0,601.0,389.0,258.0,117.0,0.0'

If i change the GCode and reduce the FILAMENT_NAMES to:
"Weiss-Blau-SW-Orange"
it will accept the GCode-File.
I search around regarding "!filament_names!" in the Start-GCode, but can´t find a definition for this command. I think it must be in the Slicer (Orcaslicer by the way) for sure. I searched in the manual from OrcaSlicer and SuperSlicer. I searched also in context of Klipper, but has no success...

I can´t figure out what's wrong with the used and exported Filamentnames.
TBH: the same String of filament names is placed into "filament_settings_id" in the GCode-File. So i have to changed it too.
edit: after some tests i found out that the "#" Character brings up the error... so the question is: is HH responsible for the string or Klipper?

[moggieuk]

The HH moonraker plugin is responsible for substituting any placeholder token of the form !xxx!. This is because many of these are not available from the slicer. You are correct that most slicers add the filament names with the following metadata line:

; filament_settings_id = "name", "name", "name", ...

Happy Hare will preprocess this and set !filament_names so it can be passed into the print start macro.

Now klipper has a big problem parsing "#" characters on the command line so they should be stripped. I'll can add a fix to strip them when they are parsed but the easiest solution for now is to remove them from your slicer or editing the ccode file after it has been uploaded to remove the "#" character..