Problems.Still can't run on the sphere.The prototype is heavy. Power of the motor, not justThere are wheel stiffness.Increasing the size of the holes in the shaft axis.The gear is not in the desired position.Make Housing.
Problems. Still can not run on a spherical model is heavy , not only are the motor of a wheel stiffness increased diameter shaft gear is not in a position to want to Housing.
Problems.Cannot run on a sphere.The master was very powerful.Power of motor not only.Wheels with friction.Increase the size of hole shaft axis.The gear is not in the opening.Do Housing.