@Work-Horse-XL said in Problem with config working with Simplify on the Tool heater:
M584
as a side note observe the order
https://duet3d.dozuki.com/Wiki/Gcode#Section_M584_Set_drive_mapping
M584 must come earlier in config.g than any M350 and M906 commands. If it creates new axes, it must also be earlier than any M92, M201, M203, M208, M350, M566, M574, M667 and M669 commands.