Extrude until user click something

  • Hi all. I am trying to implement something resembling the Ultimaker filament switching routine on RRF3. Ultimaker allows the machine to extrude material until the user clicks a button to stop the extrusion. I wonder if it is possible to achieve this with either a while loop + M291 or use an M291 command to terminate a, for example, G1 E99999 command?

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