Volvo replaced 100 parts with one casting nobody can edit.
In April 2026, Volvo started building the EX60 the way Tesla taught the industry to build: it dropped an 8,400-tonne press onto a puddle of molten aluminium and pulled out the car's entire rear underbody as a single piece. Where a conventional EV floor is 60 to 100 stamped and welded steel parts, the EX60 has one. Volvo is the first European maker to do this at production scale, and it casts that floor in roughly two minutes. The number that matters is not the tonnage. It is the one.
Megacasting is sold as a manufacturing story — fewer parts, fewer welds, fewer robots, a lighter floor, a faster line. All true. But the more interesting thing it does is move the most expensive, least reversible decision on the whole car to the very front of the process, and then weld it shut. A single-piece rear structure is not designed on a screen and refined in clay. It is designed into a die. That die costs tens of millions, takes the better part of a year to cut, and once it is cutting parts, the geometry it produces is the geometry you ship. You do not iterate a gigacast the way you iterate a bracket. You either got the crush behaviour, the mounting points, the tolerances and the repair map right before the metal cooled, or you tool it again.
This is why gigacasting is a design-intelligence problem dressed as a factory decision. Deleting the seams is elegant, and elegance is the trap. Every seam in a welded floor is also an option — a place the structure can be revised, a panel that can be swapped, a crash zone that can be re-tuned late. Cast the whole rear as one part and you trade all of those options for cost and mass. The saving is real. So is the loss: the freedom to be wrong later, cheaply.
The repairability fight makes the point visible. Henrik Fisker warned years ago that a minor knock could total a gigacast car. He was mostly wrong — Thatcham Research spent two years crash-testing and found a Model Y's rear casting survived a 15 km/h hit with no work needed, and even a medium hit came in competitive with steel once the replacement part landed at under £1,000. Toyota says its first gigacast Lexus, due this year, is being engineered specifically for repair. Tesla, meanwhile, is reportedly freezing its next-generation single-piece body to save near-term cost. The technology is not the villain. The point is subtler: repairability, insurance class, the certified-shop desert a rural owner will face, the resale value three years out — every one of those outcomes is decided by where the casting's boundaries fall, and every one of them is set at concept phase, in a die, before a single customer has hit anything.
None of it shows up in the launch render. The hero shot is a beautiful bare aluminium floor, lit like jewellery, seamless. What it hides are the states that decide whether the seam-deletion was courage or cost-cutting: the 30 km/h car-park shunt, the owner two hundred kilometres from a shop with the tooling and certification to touch it, the assessor who writes the car off because the only replacement part is the whole back of the car. Those are not manufacturing questions. They are design questions, and they are answerable — but only if you render the whole rear architecture in its lived and worst states before the die is committed, not after.
That is the case for pressure-testing the irreversible decision while it is still cheap to be wrong. A parallel design team should be able to look at a proposed casting boundary and ask, in an afternoon, what the resale buyer, the rural owner and the assessor see — not two years and one tooled die later. Volvo cast the EX60's rear in one piece because the maths on cost and mass is undeniable. The maths on everything the die freezes is harder, and it does not wait for the aluminium to cool. The one-piece floor is a bet that the studio got the whole rear of the car right on the first try. Design intelligence is what you use to check the bet before the press comes down.
Sources
- ●Volvo starts production of first vehicle with megacasting — Repairer Driven News
- ●Inside Volvo's EX60 megacasting: high-pressure die casting in two minutes — Automotive Manufacturing Solutions
- ●Volvo Deploys Gigacasting Technology to Assemble New EV — ASSEMBLY
- ●Thatcham Research: mega casting can be cheaper to repair than traditional structures
- ●Tesla Model Y Gigacast Repairs Have Improved Greatly — InsideEVs
- ●Megacasting components: And the repair? — All About Industries
