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Electric vehicles (EVs) have been at the front line of innovation for the better part of the new millennium, pioneering the advent of green technology. But now, we stand on the precipice of the next significant turning point in EVs, a seismic shift in production methodology that could dramatically slash costs and expedite manufacturing like never before, heralding a new era for the auto industry – thanks to Tesla’s cutting-edge developments.

Tesla, the name synonymous with trailblazing innovation in EVs, has been silently crafting a revolution. This revolution involves the use of enormous presses to 'gigacast' the front and rear structures of its Model Y. What does this mean to the uninitiated? A potential seismic cut in manufacturing costs, which might have rippling effects throughout the broader EV market.

The next game-changing innovation from Tesla sees die casting the entire underbody of an EV in one piece, compared to the existing convoluted process of assembling around 400 separate parts. This monumental shift in the manufacturing paradigm promises a new horizon of efficiency and speed in production. It could allow Tesla to go from blueprint to functioning car in 18 to 24 months, practically half of the typical 3 to 4 years’ timeframe in traditional auto manufacturing.

The breakthrough in this mold casting approach hinges heavily on industrial sand and 3D printing technology. By 3D printing test molds using industrial sand, the company has broken through the cost barrier typically associated with developing permanent metal molds. Tesla also plans to take it a step further by casting hollow subframes as part of one large piece, using these 3D printed sand cores.

Further, the company has been busy developing specialized alloys and fine-tuning the cooling process of molten alloys. These advancements ensure that even after such drastic shifts in production, the vehicles, irrespective of the novel manufacturing technique, meet the performance specifications that customers have come to expect from the automotive titan.

Tesla's upcoming small EV represents the perfect platform to showcase this innovative, one-piece casting. Its relatively simple underbody design offers the ideal backdrop for the implementation of these new manufacturing techniques.

The company is yet to decide on the kind of 'gigapress,' which represents a potential bottleneck in this revolutionary process. The decision on this large-scale casting machine will directly impact the complexity and cost of the car frame itself, hence the caution.

Of course, venturing into uncharted territories in manufacturing presents its own unique challenges – it’s not all smooth sailing. The larger gigapresses required to cast the substantial mold pieces would be a considerable investment and may necessitate larger factory buildings to accommodate – a factor which Tesla must consider carefully as it decides how to progress.

In conclusion, Tesla's innovation does not merely stop at dazzling car designs and future-forward features. It is also rapidly reshaping the production process, offering a glimpse into a future where electric cars are the norm, rather than the exception. As other industry players inevitably respond to the call, we can witness a tremendous revolution that could change the course of the auto industry at large. Our journey into this green, efficient, and cost-effective future looks increasingly promising.