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PLA is no good for gears, even though it has carbon fibers on it is not good. Use ABS or for best results nylon. Also that motor is no good. I tried that motor and it doesn't move the car. Use this one 2845 Motor 3100/3930KV Sensorless Brushless Waterproof 35A ESC RC Car Parts
https://banggood.app.link/vA8EWjr2wO. Now I found out that this motor is good but the esc is garbage, so you should buy a 2845 motor with a good esc.