Part designed to replace the original lego piece. Much stronger and accurate than the original. Made to withstand high rotations and high torques.

Optionally the parts can be used for fitting in aluminum profiles. The aluminum profiles are much stronger and more rigid than the original Lego profiles. They do not suffer from high torque or high speed twisting.

Assembly instructions: After the parts are printed, the fitting starts from the planet gears and then by the sun gears. To engage the sun gears, place them in the opposite position out of the final position and make the turn to fit them into the final position at the same time.