The Redesign Of The Tesla Model Y Body Was Inspired By A Toy Car

Sign up for daily news updates from CleanTechnica on email. Or follow us on Google News!

Tesla Overhauls The Body Shop For Model Y In Push For Full Body Casting

In their latest podcast, the Third Row Tesla crew talked with Elon Musk and Sandy Munro about some of the innovations Tesla brought to bear in optimizing the design of the Tesla Model 3. The new episode was released to Third Row Tesla’s Patreon supporters this morning and will be released on all your favorite media channels shortly: Website | Twitter | YouTube | Stitcher | Spotify.

The Tesla Model 3’s body was criticized by Sandy Munro in his early teardowns for an excessive amount of glued parts, unnecessary complexity, and potential failure points. “As Sandy accurately pointed out, the rear of the Model 3 looks like a patchwork quilt,” Musk said. “It’s not great.” Tesla improved upon this in the Model Y and has plans to do far more than it is already doing with a new unibody casting that came into existence as a result of looking at Hot Wheels versions of the Tesla Model S. When looking at the small toy cars, Musk wondered if the same single casting concept could be applied to their full-scale vehicles.

The Body Shop at Tesla’s Fremont Factory. “It’s sort of cool in a steampunk way, but not something you want to repeat,” Musk said. Image credit: Kyle Field, CleanTechnica

Today, the Tesla Model Y utilizes castings to bring together many of the small stampings, extrusions, and whatnot that comprised the rear of the vehicle into a handful of larger cast parts. “The current version of the Model Y has basically two big high-pressure die-cast aluminum castings that are joined.” That is a clear improvement over the Tesla Model 3, but Tesla wants to do more. “Later this year, we will transition a single piece casting that also integrates the two rear crash rails,” Musk said. Upon hearing this, Sandy Munro simply said, “Whoa!”

Consolidating the design of the body of the vehicle from a ton of parts built with dozens of disparate processes cuts down the amount of inventory, spare parts, raw materials, assembly processes, potential failure points, and more. Said another way, it’s cheaper, faster, and more efficient. “The current castings, because you have to interface with so many things, you have to CNC machine the interfaces and join all these things,” Musk said. “It’s quite difficult.”

Consolidating all the various welding, gluing, bolting, and riveting tasks from the Tesla Model 3 body shop into a single casting also translates to a smaller manufacturing footprint. “The manufacturing cost is much less and we see a 30% reduction in the size of the body shop, which is huge,” Musk said. That’s massive. Having walked through the Tesla body shop for the Model 3 last year, I can say that while it was extremely impressive to see so much automation being leveraged to build the body of the vehicles, the prospect of eliminating all those individual processes for a single casting that requires minimal processing after the fact is exciting.

The new rear assembly in the Model Y represents a drastic improvement over the Model 3, and Tesla is already hard at work on the next generation. “The single piece casting has no CNC machining,” Musk said on the Third Row Podcast. “It doesn’t even have datums. That’s profound, really. It took us a lot of iterations to get there. It sounds obvious.”

To bring the vision of massive cast body components to reality, Tesla bought not one, but two of the world’s largest casting machines. “It’s the size of a small house,” Musk said. “We should be starting to set up the one from Italy next month.”

Musk said that it was likely the tech would make its way into the Model 3 as well. “It’s probably something we would do, but maybe in like 2 years.” He commented that the design of the Model 3 body was a pain in the ass, but it worked. “We have to deal with the pain in the asses that don’t work. Those are the higher priorities,” he said.

Tesla continues to hire and inspire some of the best engineering minds of our day, but capacity continues to be a limiting factor for them. “There’s a lot of fish to fry here,” Musk said. From the outside looking in, the culture of continuous innovation and improvement is inspiring, but the frayed edges are maddening just the same. It’s a delicate dance that’s churning out some of the most exciting innovations in software, hardware, electronics, computing, chemistry, and mechanical engineering the world has ever seen. What an exciting time to be alive! The future is now, peeps.

For more direct insights from Sandy Munro and his team at Munro & Associates, head over to to see their teardown of an early build of the Tesla Model Y.

If CleanTechnica has helped you learn about Tesla or Tesla’s Energy products, feel free to use my Tesla referral code — — to get 1,000 free Supercharging miles with the purchase of a new Tesla vehicle or a $250 award after activating a new Tesla solar system. If you’re anything like me, the award serves as a nice bonus after doing something great and feels a lot like finding a toy in a box of cereal, back when that was still a thing. 

Have a tip for CleanTechnica? Want to advertise? Want to suggest a guest for our CleanTech Talk podcast? Contact us here.

Our Latest EVObsession Video

I don't like paywalls. You don't like paywalls. Who likes paywalls? Here at CleanTechnica, we implemented a limited paywall for a while, but it always felt wrong — and it was always tough to decide what we should put behind there. In theory, your most exclusive and best content goes behind a paywall. But then fewer people read it!! So, we've decided to completely nix paywalls here at CleanTechnica. But...
Like other media companies, we need reader support! If you support us, please chip in a bit monthly to help our team write, edit, and publish 15 cleantech stories a day!
Thank you!

CleanTechnica uses affiliate links. See our policy here.

Kyle Field

I'm a tech geek passionately in search of actionable ways to reduce the negative impact my life has on the planet, save money and reduce stress. Live intentionally, make conscious decisions, love more, act responsibly, play. The more you know, the less you need. As an activist investor, Kyle owns long term holdings in Tesla, Lightning eMotors, Arcimoto, and SolarEdge.

Kyle Field has 1638 posts and counting. See all posts by Kyle Field