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some people have issues printing PLA with the all metal E3D hotend. you need to make sure the cooling fan is working very well and print faster than normal. 215C is very hot for PLA typical is 185-200C
Crazy after printing? must be your zero offsets somehow. If your start and end gcode is what I recommend I am not sure where it could go wrong I use mine several days in a row with multiple prints without turning them off.
The dimensions should be fine. That 41 might be from just bad extrusion. The x and y steps don’t change. Maybe your belts are too tight, or too loose.
Nozzle touching print, Can’t tell anything from an over head picture, I would need a side shot.
marlin changes are easy, but not needed. http://www.vicious1.com/marlin-firmware/