So I have my start gcode set to warm my bed to a specific temperature before heating the hotend and bed to the final temperature. I was wondering if there is a way to set this first temperature as a variable relating to the final temperature instead of only being able to set an exact number. Eg, my current gcode is below:
M190 S55 ;Preheat bed to 55C
M104 S{material_print_temperature} ; begin heating nozzle to final target
M140 S{material_bed_temperature} ; begin heating bed to final target
G28 ;Home
M190 S{material_bed_temperature} ; Wait for final bed temp
M109 S{material_print_temperature} ; Wait for final nozzle temp
This works fine until I switch filaments that have different bed temps and forget to edit the start gcode. I'd like to do something like this:
M190 S{material_bed_temperature}-10 ;Preheat bed to 10C below final target
Is it possible to do math in the start gcode? I saw a couple older posts saying no, but not sure if that changed in recent updates. If not, is there some way to do this with a post processing script?
