Customization of the Gcode file name - question about placeholder variables  

Customization of the Gcode file name - question about placeholder variables

Hello all,

I have a question about customizing the Gcode filename based on the initial_tool used in the print.  My first attempt used the following (with the "default" format shown first:

Default:

{input_filename_base}_{layer_height}mm_{filament_type[0]}_{printer_model}_{print_time}.gcode

My customized version:

{input_filename_base}_{layer_height}mm_{filament_type[initial_tool]}-SLOT{initial_tool}_{print_time}.gcode

The above fails when I try to export the Gcode file, stating "Not a variable name" and with the carat pointing at the first letter of 'initial' after the filament_type.  I would like to use the initial tool of the print job rather than a hard-coded reference to the material loaded in slot 1 (tool 0) to determine filament type and the slot location.

As an example of what I want, for a print with PETG loaded in the 5th position (tool4), I want the filename to be:

filename_.15mm_PETG-SLOT5_print_time.gcode

I now realize that the "slot" number and "tool" number would be off by 1 (since the tool number starts at zero), but perhaps I could do a +1 to that value to convert?  Otherwise I would probably rewrite the above and say "TOOL" instead of "SLOT" (not idea, but I could live with that).

I successfully used the initial_tool variable in my startup Gcode to do a check of the first_layer_temperature to check whether my enclosure temperature should be 30C or 40C with the following (which works perfectly):

{if first_layer_temperature[initial_tool] > 225}
ENC O2 W0 S40 ; set enclosure temp to 40 degrees C (for non-PLA materials)
{else}
ENC O2 W0 S30 ; set enclosure temp to 30 degrees C (for PLA materials)
{endif}

I poked around in Github to find "initial_tool" as defined in the code, and it is an integer.  This led me to believe that my code above for the filename template should work, but I am obviously missing something.