There is an asymmetry in how additive manufacturing is reported. Metal AM (DMLS, EBM, binder jetting, wire-arc) gets disproportionate attention, with images of titanium aerospace brackets and printed steel impellers all over the trade press. Polymer AM, despite doing the bulk of actual industrial work, is the quieter cousin.
For an engineer weighing a real project, the honest question is which technology family the application actually needs. The answer is not always metal, and the difference in cost and lead time can be enormous.
What metal AM is actually good at
Metal AM is the right answer when the application demands mechanical performance, temperature resistance, chemical compatibility or wear behaviour that no polymer can match. Highly loaded structural parts, hot section turbine components, things that live above 250 degrees Celsius in continuous service, and components in chemically aggressive environments all sit firmly in metal territory.
Metal is also the right answer when the part replaces an existing metal item where material substitution would disturb downstream considerations. Galvanic compatibility, regulatory frameworks built around metallic assumptions, and certification baselines all favour staying in the same material family.
Where polymer AM does the work
Polymer AM is the right answer for most applications. Brackets and fixtures with modest loads. Housings and enclosures. Cabin and interior fittings. Tooling and jigs. Prototypes and pre-production articles. Specialty equipment of all kinds. The list is long and largely covers the bulk of industrial AM demand, most of which we handle in-house through our FDM and SLA lines.
Polymer is also typically five to twenty times cheaper per part than metal AM, and ten to fifty times faster. For applications where the polymer mechanical envelope is sufficient, the cost and speed advantage is decisive. The reinforced engineering grades we stock through OzFDMcover the upper end of that envelope.
Metal: high load, high temperature, harsh chemistry
Metal: aerospace primary structures and hot section parts
Metal: certification frameworks built around metallic assumptions
Polymer: most brackets, housings, fittings and tooling
Polymer: prototypes, low volume production and consumer products
Ask the question early
A large share of metal AM enquiries could be solved in carbon fibre nylon at a fraction of the cost. The discipline is asking that question early enough to make the swap before the design is locked.
Hybrid: when the answer is both
An increasingly common approach is hybrid: Metal AM for the high-load structural cores, polymer AM for the surrounding non-structural components, traditional fasteners or adhesive across the joints. This combines metal's structural envelope with polymer's design freedom and cost profile.
Many high-performance products (UAV airframes, sports equipment, defence kit) use this hybrid pattern routinely. The discipline is identifying which parts of the assembly need which material family, ideally before either side of the design is committed.
KEY TAKEAWAYS
Metal AM is justified by performance, not by impression
Polymer AM covers most industrial work at a fraction of the cost
Hybrid metal and polymer assemblies are increasingly common
Material decisions made early protect the budget
Capable polymer AM is well established in Australia; specialist metal AM less so