Part of the "production hell" that Tesla's Model 3 has been going through was due to too much automation along the manufacturing lines, Elon Musk said, indicating that robots are not all they have cracked up to be, and human contributions have been undervalued.

After Tesla's chief executive Musk took CBS This Morning's co-host Gayle King on a tour of the Silicon Valley factory, Musk said later on Twitter commenting on the CBS story "Yes, excessive automation at Tesla was a mistake. To be precise, my mistake. Humans are underrated."

To CBS, Musk said:

"We got complacent about some of the things that we felt were our core technology….We put too much new technology into the Model 3 all at once. This — this should have been staged."

Asked by CBS host King whether robots actually slowed production, Musk said:

"Yes, they did….We had this crazy, complex network of conveyor belts….And it was not working, so we got rid of that whole thing."

Musk said that he was back to sleeping at the factory in an effort to solve the Model 3 production issues, and that he was now more optimistic about the rate of Model 3 production, after solving some "critical things" that were holding back Tesla from producing more Model 3s and from reaching its self-imposed production target.

Asked if the 2,000 Model 3s per week rate is sustainable, Musk told CBS "We'll probably have, I don't know, a three or four-fold increase in Model 3 output in the second quarter."