What happened?

Apple's long-awaited foldable phone, the iPhone Duo, has been unveiled. The most notable detail is not in the display but in the hinge: according to Apple, it is designed and manufactured with the help of AI and 3D printing.

This is Apple's first entry into the foldable category. The category attracts consumer enthusiasm, but its form factors have not always lived up to it: foldables, which by design undergo twice as much wear as a conventional device, mostly suffer significant degradation and do not match the durability of other phones.

What exactly does AI do in the hinge?

Apple's chief hardware officer Johny Srouji described the process at the event: "During manufacturing, we use AI algorithms to precisely match each individual hinge with its best-fit housing to ensure perfect alignment, and a confocal laser progressively scans the topology of every single unit, and 3D prints up to 25 micro layers of a custom photopolymer to eliminate residual waviness."

The distinction inside that sentence matters: AI is not producing the design here, it is doing matching in manufacturing. The model's job is not to invent the hinge's shape but to decide which housing each manufactured hinge should be joined to.

  • Matching: AI algorithms pair each hinge with its best-fit housing.
  • Scanning: A confocal laser measures the surface topology of every unit.
  • Compensation: Residual waviness is filled in by 3D printing up to 25 micro layers of a custom photopolymer.

Why go to this much trouble?

In a foldable, the hinge is the most mechanically stressed part of the device and the main source of the crease in the display. Manufacturing tolerances here are far tighter than in an ordinary phone; a mismatch at the micron scale becomes a visible defect after thousands of open-and-close cycles.

Apple's approach therefore makes sense: instead of manufacturing parts more precisely, it compensates by measuring and matching the variation among the parts it produces. That is a method well known in the semiconductor industry, applied to a mechanical component.

Other durability measures

Srouji also said the phone has a custom nano-texture finish that significantly reduces glare and reflections, along with a multi-layer lamination strategy designed to increase durability.

Watch the phrase "designed with AI"

This is where the story most easily goes wrong in headlines. "The hinge was designed and built with AI" suggests a model generated the hinge geometry from scratch. The process Srouji described does not say that.

What is described is an optimisation on the production line: an algorithm deciding which part pairs with which, plus a measurement-based compensation step. That is valuable engineering, but it is not design — it is an advanced form of quality control.

The practical importance of the distinction: if a model had produced the design, the same approach could carry directly to other parts. Matching, by contrast, is a process that has to be built separately for each product line — the gain is real but its transferability is limited.

What has to be said

All of this information comes from Apple's own account, and there is no independent durability measurement. In foldables the real test is not in the first days but after tens of thousands of open-and-close cycles.

So "a hinge produced with AI" does not mean the device's durability problem is solved; it means the problem is being addressed from the manufacturing-tolerance side. Whether these measures keep the Duo in good condition over the long run remains to be seen.