Helpful GCODE for Vyper - rchamp26/Octoprint_AnycubicVyper GitHub Wiki
When using PrusaSlicer, the default Anycubic Mega model we create our Vyper profile from doesn't allow to enable the built in nozzle LED when prints start and prints end. If you want to enable this you can enter the following commands in the GCODE
In Printer Settings > Custom G-Code > Start G-Code
M355 S1; led on
In Printer Settings > Custom G-Code > End G-Code
M355 S0; led off