Mine were on the side of the arms. It's from the torque of the motors stressing the structure of the plastic. If the plastic was slightly thicker,like the P4?, there might not be any issues.I have been hearing more that these stress cracks are over tightening of the screws. Makes sense since that is where they happen. When mine gets back, I am going to check all and make sure they are not over tightened.
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