Metal or Polymer? Choosing the Right Additive Manufacturing Technology

Most organisations approaching industrial additive manufacturing for the first time start with the wrong question. They ask which machine to buy. The question that actually determines the answer is which material family the application needs — because metal and polymer systems differ in cost, facilities, operation, and economics by roughly an order of magnitude.

Getting this wrong is expensive. Buying metal capability for applications that polymer would have served is the most common and costly error we see.

The Simple Answer

Choose polymer when the part does not carry significant structural load, operate at high temperature, or face aggressive chemicals; when you need parts quickly and in reasonable numbers; and when cost per part matters more than ultimate mechanical performance. Prototypes, jigs, fixtures, gauges, housings, ducting, interior components, models.

Choose metal when the part is load-bearing, operates hot, must resist corrosion, or replaces something that was previously machined or cast from metal. Structural brackets, valve and pump components, tooling inserts, implants, propulsion hardware.

Most organisations need polymer more often than they expect and metal less often than they assume.

Cost — The Difference Is Larger Than Expected

Capital cost differs substantially between polymer and metal platforms, but the gap in running cost is what catches buyers out.

Metal powder costs considerably more per kilogram than polymer powder, particularly in titanium and nickel superalloys. Metal builds generally run slower. Metal parts almost always require post-processing that polymer parts do not: stress relief, heat treatment, support removal, and machining of critical surfaces. A metal part is rarely finished when it leaves the machine, and the finishing is not free.

Metal also carries facility requirements that polymer does not — inert atmosphere handling, powder management, filtration, and the safety procedures that reactive powders demand.

Across a realistic production mix, the delivered cost of a metal part is typically several times that of an equivalent polymer part. Where polymer meets the requirement, it is almost always the better commercial answer.

Properties — What Each Can Actually Do

Polymer laser sintering produces genuinely functional parts, not models. PA12 and PA11 deliver mechanical properties suitable for working components and are used in production across automotive and industrial applications. TPU gives flexibility for seals and gaskets. High-temperature systems extend the range considerably: Farsoon's 252P series reaches chamber temperatures up to 280°C for high-performance polymers including PA6, PA66 and PEI, opening up direct-use applications that standard laser sintering cannot reach.

But polymer has limits. Load-bearing structural applications, sustained high temperature, aggressive chemical exposure, and anything requiring metal's stiffness or fatigue behaviour fall outside what polymer can do.

Metal laser powder bed fusion produces parts with properties approaching and sometimes matching wrought material, across aluminium, titanium, stainless and tool steels, nickel superalloys and cobalt chrome. This is what makes implants, pressure-containing components and propulsion hardware possible.

A Practical Test

Work through these in order:

Was this part previously metal? If it was machined or cast from metal and performs a structural or thermal function, it probably still needs to be metal. If it was metal mainly because that is what the workshop had, polymer may serve.

What temperature does it see? Above roughly 180°C, standard polymers are out. High-temperature polymer systems extend this, but beyond their range metal is the answer.

Does it carry meaningful load? Not "does it need to be strong" — most parts do. Does it carry structural load where failure matters?

What is it exposed to? Fuels, solvents, acids, or sustained UV narrow the polymer options considerably.

How many do you need, how often? High part counts push toward polymer economics. Occasional high-value components support metal.

If three or more answers point to polymer, buy polymer capability first. It is the lower-risk entry point, and plenty of organisations never need metal at all.

Starting With Both

Some organisations genuinely need both, and the usual sequence is polymer first.

Polymer is more forgiving. Facility requirements are simpler, powder handling is less demanding, and the cost of a failed build is lower — which matters a great deal while a team is still learning design for additive manufacturing. The design skills transfer almost entirely to metal: build orientation, support strategy, and thinking in layers rather than in machining operations are the same disciplines.

A team that has run polymer production for a year will commission a metal system far more successfully than a team starting cold.

Matching Platform to Requirement

Polymer: the 403P series for general production with eight-zone thermal control; Flight systems where throughput matters, using fiber lasers at scan speeds above 20 m/s with feature detail to 0.3mm; the 252P series for high-temperature engineering polymers; the HT601P-4 for large-format work.

Metal: the FS191M for compact work including dental, medical and R&D; the FS273M for general industrial production in a compact footprint; the FS350M and FS421M for larger components and continuous production; the FS422M and FS721M for large-format and high-throughput series production.

Our Dubai demonstration centre lets you benchmark your own parts on both metal and polymer systems before deciding — generally more informative than any specification comparison.

Frequently Asked Questions

H3: Can one machine print both metal and polymer?

No. Metal laser powder bed fusion and polymer laser sintering are different processes requiring different machines. Metal systems need inert atmosphere, reactive powder handling, and filtration that polymer systems do not. Organisations needing both capabilities buy both platforms, usually in sequence rather than together.

H3: Are polymer 3D printed parts strong enough for real use, or only for prototypes?

Polymer laser sintering produces genuinely functional parts, not just models. PA12 and PA11 are used in production applications across automotive and industrial sectors, and high-temperature systems extend the range to engineering polymers including PA6, PA66 and PEI for direct-use parts. The limits are structural load-bearing applications, sustained high temperature beyond the system's range, and aggressive chemical exposure.

H3: What is the difference between SLS and LPBF?

The terms describe the same basic principle applied to different materials. Laser sintering generally refers to polymer powder bed processes, while laser powder bed fusion generally refers to metal. Both build parts layer by layer by fusing powder with a laser, but they differ in operating temperature, atmosphere, powder handling, and post-processing requirements.

H3: If we eventually need both metal and polymer, which should we buy first?

Polymer, in most cases. Facility requirements are simpler, powder handling is less demanding, and the cost of a failed build is lower while a team is still learning. The design skills transfer almost entirely — build orientation, support strategy, and thinking in layers are the same disciplines — so a team with a year of polymer production behind it commissions a metal system far more successfully than one starting cold.

H3: Can we test our own parts before deciding?

Yes. Our Dubai demonstration centre lets you benchmark your own part files on both metal and polymer systems. For most buyers this is considerably more informative than comparing specification sheets, because it answers the question that actually matters: what does this machine produce with our geometry and our requirements.

Not sure which fits your application? → Book a demonstration