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Leading up to Sunday morning’s production milestone, Musk paced the Model 3 line, snapping at his engineers when the around-the-clock production slowed or stopped due to problems with robots, one worker said. Tesla built a new line in just two weeks in a huge tent outside the main factory, an unprecedented move in an industry that takes years to plan out its assembly lines, and said the tented production area accounted for 20 per cent of the Model 3s produced last week.

“They were borrowing people from our line all day to cover their (Model 3) breaks so the line would continue to move,” said a Model S worker on Sunday.

Because of the focus on the Model 3, the S line is about 800 cars behind, the worker said.

“They’ve been throwing Model 3s ahead of the S to get painted to try to assure that they make their goal of 5,000,” the worker said. “The paint department can’t handle the volume.”

Disruption of the Model S and X lines could threaten Tesla’s target of building 100,000 of those vehicles in 2018. Tesla built 49,489 of those cars in the first half of this year.

Photo by David Paul Morris/Bloomberg

Asked about the potential S and X impact, Tesla said it also produced 1,913 of those vehicles during the last week of the quarter along with its Model 3s.

Tesla said it built a total of 28,578 Model 3s in the second quarter, and 40,989 since production began last July.

Last week’s big push also brought a rewrite of the employee attendance policy. After mandatory weekend shifts were assigned, two workers said, Tesla rescinded a policy promising workers at least one week’s notice before weekend work.