I have a home made Delta printer. I have implemented my own FSR based bed leveling sensors. I can do a 3 point bed leveling scheme that works well. But, I would like to be able before each print to have the probe touch the bed and then create a negative z offset for that touch. So, when the FSR is triggered, the nozzle is at bed height and I need it backed off a bit. I have tried several methods but am not having much luck. What would be the best method to have the bed get probed for height, then set the height in script to back off .1 or .2mm. ?
Currently when I do it manually, after doing calibration and homing, I will use M306 Z0 to set the new Z position. But I would like to automate this.