It is not possible to cancel printing immediately after the start, until the heating occurs!

Features
11
  • As indicated by @EddyMI3D, these command cannot be reliably interrupted (except by a M112 emergency stop)
  • The Klipper developer already attempted to implement this function, but this left the printer in an unreliable state. It is a core functionality that the firmware precisely executes a command that is scheduled in a so-called queue with a bunch of the following commands. Messing with this apparently is quite complex
  • See New gcode to interrupt the pending command queue for more details
  • Usually the non-blocking variants or Klipper’s special gcodes should be sufficient to achieve your goal

@hcet14
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