I have the Smart effector but with the ramps 1.4 board and the smart effector seams to be triggering with height? if i go within about 110mm of the heated bed the smart effector triggers. So in effect it becomes inoperable. (I will eventually get the duet board but cant afford it at this time.)
Could this be do to the proximity of the electronics? ie power supply arduino and ramps boards are all located under the bed.