3D printing metal: how it works, and when to skip it

Metal 3D printing sounds like magic: a titanium or aluminium part, produced straight from a 3D file, with no mould and no machining. The process is real, it is reliable, and it is used in aerospace, medical devices, motorsport. But it answers a specific need — and it is not the need behind most projects that reach us.

This article explains how metal 3D printing works, why it is a costly process, and above all: in which cases a technical plastic does exactly the same job, for far less. We do not produce metal in-house — which makes it easy for us to give you an honest opinion, not a sales pitch.

How metal 3D printing works

Several process families exist, but two dominate the market.

Laser powder bed fusion (DMLS / SLM)

A high-power laser melts a thin layer of metal powder deposited on a build plate, layer after layer. The part builds up inside a sealed chamber under a controlled atmosphere (usually nitrogen or argon) to prevent oxidation. It is the most common process for aluminium, titanium, stainless steel or Inconel.

The result is a dense part, with mechanical properties close to a forged one. But the machine costs several hundred thousand euros, metal powder is expensive and sensitive, and the operation requires sharp metallurgical expertise.

Binder jetting

A liquid binder agglomerates metal powder layer by layer, with no melting involved. The resulting "green" part is fragile: it then goes through a debinding furnace and a sintering step, which densifies it and gives it its final strength. The process allows higher throughput than laser fusion, but requires anticipating material shrinkage from the design stage, and involves a long post-processing chain.

In both cases: mandatory post-processing

A printed metal part is rarely usable straight off the machine. Supports need to be removed (often welded to the part, so cut and ground off), internal stresses relieved through heat treatment, and functional surfaces sometimes machined to hold a tight tolerance. These steps weigh as much as the printing itself in the final lead time and cost.

Why metal 3D printing costs noticeably more

Three factors explain the price gap with an equivalent plastic part:

• The raw material. Metal powder sells by the kilogram at a price with no common measure to a filament or a resin, and it must meet strict purity standards.
• The machine and the environment. Inert atmosphere, filtering of residual powder (some are explosive in suspension), heavy maintenance: the investment and operating costs sit in a different league than FDM or resin.
• Skilled labour. Laser parameter tuning, quality control, heat treatments, finishing: each step needs specific trade expertise, both before and after printing.

The outcome: for an identical part volume, metal 3D printing almost systematically sits in a higher price bracket than a technical plastic part — sometimes significantly so. That does not make it a bad investment. It means you need to be sure you actually need it.

When a technical plastic is enough

Most projects that mention "metal" are actually looking for a specific property — stiffness, temperature resistance, wear resistance — not metal as such. Several technical FDM materials cover a good share of these needs:

• PAHT-CF (carbon-fibre nylon). Rigid, light, dimensionally stable. It is our go-to replacement for a lightweight metal part: bracket, support, technical enclosure, lightly loaded mechanical part.
• ABS and ASA. Good heat and impact resistance; ASA also resists UV and weather. Useful for parts exposed outdoors or near a moderate heat source.
• PLA-CF. Stiffness and a matte, fibred look, for lightly loaded parts where the "carbon" appearance is also wanted.
• TPU 95A. When the part needs to absorb an impact or flex, precisely where metal would not be the right choice.

These materials do not replace metal everywhere. But for a short production run, a functional prototype, a workshop jig or a lightly loaded spare part, they do the job at a fraction of the lead time and cost. Our materials page details the properties of each one, and our article on FDM or resin helps you place technical FDM among our two process families.

When you genuinely need metal

There are cases where no plastic, even carbon-fibre-filled, replaces metal:

• High operating temperature, beyond what a technical plastic can hold (above roughly 150–200 °C depending on the material).
• Mechanical strength under continuous, sustained load, in fatigue, where even a plastic composite eventually creeps.
• Thermal or electrical conductivity, which only a metal provides.
• Regulatory certification mandating metal in a given sector (aerospace, implantable medical devices, food contact under certain conditions).
• A corrosive environment or autoclave sterilisation, beyond the reach of common plastics.

If your part checks one of these boxes, metal is not a luxury, it is a technical necessity. Better to know it before committing to the wrong material.

Our position: no metal in-house, honest advice

We do not produce metal in-house. Our workshop works in FDM and resin, on standard and technical plastic materials. This is a deliberate choice: rather than investing in a process we would master poorly, we prefer staying excellent at what we do, and pointing you clearly elsewhere when it is not the right tool.

Concretely, two scenarios:

1. Your part can be plastic. We tell you so, and we suggest the most suitable technical material — often with a significant gain in lead time and budget compared to metal.
2. Your part genuinely needs metal. We point you to specialised DMLS/SLM subcontracting partners we work with for projects that require it. You keep a single point of contact for advice, even when manufacturing happens outside our workshop.

It is the same transparency that leads us to spell out, on every quote, what drives the price — see our article on how much a 3D print costs.

Moving forward on your project

Torn between metal and a technical plastic for your part? Tell us about your project or start an online estimate. We look first at the part's actual function — load, temperature, environment — before talking material. For a prototype to validate quickly, our rapid prototyping offer relies on our technical FDM materials.

Frequently asked questions

Do you offer metal 3D printing?

No, not in-house. Our workshop works in FDM and resin, on standard and technical plastic materials. For a genuine metal need, we point you to specialised subcontracting partners while keeping the upfront advice.

Why does metal 3D printing cost more than FDM?

Metal powder, the machine, the controlled atmosphere and post-processing (debinding, sintering, heat treatment, finish machining) require equipment and expertise far heavier than FDM or resin. The cost gap follows directly from that.

Can a fibre-filled plastic really replace a metal part?

For many uses, yes. Carbon-fibre nylon (PAHT-CF) or ABS cover a good share of stiffness and lightness needs. Beyond a certain temperature, continuous load, or regulatory requirement, metal remains necessary.

How do I know if my part needs metal?

By looking at its actual function: operating temperature, continuous mechanical load, environment (corrosion, sterilisation), and any sector-specific certification. Send us your need and we give you a clear opinion before any quote.