Hi I have a Creality CR 10 and printed many things with good quality (0,1-0,15-0,2mmm layer height) but last week something go wrong, now i can’t print 0,2 layer height because some layers are missing. The machine sometimes doing well, but sometimes not. I think I have Over Extrusion. My first impression was that the spring was weakened, so I made two 1mm washers to make the spring stronger. Secondary the gear and the nozzle are clear. I don’t what is the main problem, and what do i do. So please help me if you can. I am enclosing 2 picture. (Left Stormtrooper helmet made with 0,2; the right made with 0,15 mm layer height.