My printer is a Prusa I3 type of unit in a cube frame, using Ramps 1.4 and Marlin. It's been printing fine for months now, even upgraded the bed to a 5mm ally plate and a 240v heater via an SSR, man does that bed heat up quick. Also got auto leveling working and that made a nice improvement to me printing.
Well out of the blue, all of a sudden on Friday evening my Z height and home offsets started playing up. I should say that my home position is X to the left, Y to the rear and Z at the top. Whats happening is that when it homes the display is showing the correct offsets for X and Y, -60 and -20 mm but the Z is showing 385.8 mm, it should be 207 mm. I have tried resetting the zero point and the home offsets with no luck. If I issue a M501 command the M206 line reads as it should be, X-60.00 Y-20.00 Z207.00 but the display says Z is 385.8 and sure enough if I try to print the Z want to go way down past the plate.
I have changed out the Mega board in case it was a memory fault on it and changed the Z driver in case that was faulty but with no luck. I have attached a dump of the M501 and of my Configuration H file. Any thoughts or help wold be most appreciated.
