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@CP_9 M950 by itself won't do anything. you also need M581 https://docs.duet3d.com/en/User_manual/Reference/Gcodes#m581-configure-external-trigger
Have you redone a touch calibration?
Do you have a case on the Panel? Is it pressing against the screen?
@jayt cold extrusion prevention is not yet implemented on extruders driven by expansion boards. See https://docs.duet3d.com/en/User_manual/RepRapFirmware/CAN_limitations#temporary-limitations.
@dp_23 update your firmware to at least 3.3 stable
