Rock solid repeatability so far, no recalibration needed. But servos are mechanical and certainly have limits. The more you use them, the internal pots and gears will wear out. These Hot Wheels weigh ~35 grams, on the heavy side for an arm this small. So here I'm operating them at a small radius, which keeps the servo loads low. Lifting heavy things at the outer edge of the operating range would dramatically increase the servo loads and cause more wear. I'm not in any hurry to damage the arm, it was built for accuracy, not payload.