“Additively manufactured” appears on many spec sheets these days. What it concretely means for a watch – and what it does not – is what this article explains, using the HexaCore case as the example.
Additive instead of subtractive
A traditional watch case is made subtractively: a machine mills away everything from a solid block of steel or titanium that is not case. Additive manufacturing reverses the principle. A laser melts metal powder layer by layer exactly where material should remain. The case grows from the bottom up – typically in layers of a few hundredths of a millimetre.
What becomes possible
Shapes that would be uneconomical or impossible to mill are feasible additively: internal structures, complex transitions, geometries unconstrained by tool paths. The HexaCore case gained its hexagonal base shape with details that come directly from the digital design.
The surface: raw is not a defect
Additively manufactured titanium has a characteristic, slightly rough surface after the process – created by partially melted powder on the outer faces. You can polish it away until the part looks milled. At fUSIO24 it deliberately stays visible: it is the evidence of the process. Only what function demands gets post-processed – the workshop report explains why this decision was made.
What a printed watch is really measured by
The process changes nothing about the requirements: a watch must be water resistant, wearable and serviceable. That is exactly where early attempts failed – not at printing itself, but at sealing surfaces, tolerances and screw connections. HexaCore achieves 10 ATM water resistance with a sapphire crystal and a proven NH35 automatic movement. Additive manufacturing does not replace watchmaking; it changes how the case comes into being.
In short
- Additive = built up from metal powder, layer by layer, by laser.
- Subtractive = milled from a solid block.
- The rough titanium surface is a process result – deliberately visible at fUSIO24.
- Water resistance, tolerances and serviceability decide whether a printed part becomes a watch.
What this feels like on the wrist: HexaCore Original.