o<unclamptool> sub

M64 P2 ; unclamp the tool

M66 P2 L3 Q2 ; check the unclamped tool sensor
o100 if [#5399 LT 0]
    (abort, Failed to release tool) ; abort if the sensor does not activate in 2 seconds
o100 endif

o<unclamptool> endsub [1]

M2