Hi, When i do an auto calibration from scratch i can get all 3 points to either 0 offset or 0.1 offset but the front left corner always has an offset of 0.2. I have bought a new platform and again the offset is 0.2. Is there a chance that i could have bent the arm which holds the heatbed.
Probably not, the heated be is fully supported by the 3 adjustment points....it shouldn't matter if the arm is bent (unless grossly beyond adjustment range). Did you buy a new heater bed, or just perf plate?
I bought a new perfboard.