Yes.!. i tightened the short belts. and the end caps are fine too.
Also i changed e steps per mm to 100 from zero.` Small parts are good. but large parts are not good. same problem. Outer layer peels off . Also there is ticking sound from motor. When i touch the filament, i can sense the motor skips,it pushes back the filament and hence gaps inbetween outer shell.