Every foldable phone eventually has a hinge problem. Apple knows this, and instead of pretending otherwise, it apparently handed part of the engineering work to AI. According to TechCrunch, the hinge on the Duo, Apple’s first foldable phone, was designed and built with the help of AI algorithms and 3D printing. That detail alone makes this more interesting than most foldable announcements.
Johny Srouji, Apple’s chief hardware officer, explained the process at the company’s Surprise and Shine event. During manufacturing, AI algorithms match each individual hinge with its best-fit housing to get precise alignment. A confocal laser then scans the topology of every unit, and 3D printing deposits up to 25 micro layers of a custom photopolymer to remove residual waviness. That’s a per-unit calibration process, which is unusual at consumer hardware scale and suggests Apple is taking the durability issue seriously rather than just marketing around it.
The context here matters. Foldables have been commercially available since Samsung’s first Galaxy Fold in 2019, and the category has improved significantly. But durability remains the core complaint. Hinges wear out, crease lines deepen, and screens fail faster than on traditional phones. Google’s Pixel Fold and OnePlus Open have made progress, but no manufacturer has fully solved the problem. Apple entering this space with a manufacturing process built around per-unit precision is a direct acknowledgment that the hinge is where foldables live or die.
Srouji also mentioned that the Duo has a custom nano-texture finish to cut glare and a multi-layer lamination strategy aimed at improving overall durability. Those are meaningful additions, but they’re also the kinds of claims that need real-world testing to mean anything. Teardowns, drop tests, and six months of daily use will matter more than event stage descriptions.
For developers and product teams, the manufacturing approach is worth paying attention to beyond the phone itself. Using AI to handle per-unit component matching at scale is the kind of application that tends to spread across industries once one company proves it works. If Apple’s hinge holds up over time, expect other hardware makers to start asking how they can apply similar logic to their own tolerance and assembly problems.
Whether the Duo succeeds commercially is a separate question. But the engineering decisions Apple made here are not typical, and that’s what makes this worth watching.
