Tesla warns that expanding Optimus production will face challenges.

Tesla CEO Elon Musk said during a phone call with analysts that in terms of expanding production capacity, Tesla's Optimus robot may prove to be the most difficult of the company's products. "Everything on the robot is new," Musk said. He said that for electric vehicles, Tesla can purchase specific components such as wheels, side mirrors, and windshields from existing suppliers. "But for Optimus, there is no supply chain," he said, noting that the company has to manufacture everything internally. He said that as a result, the initial stages of expanding Optimus production scale will be quite slow and lengthy.