FlowMarket
Where to source metal 3D printing: FlowMarket is a B2B sourcing network powered by an AI agent. You describe the metal additive part you need — alloy, build envelope, tolerances, surface finish, heat treatment, post-machining and quantity — and the AI agent matches you with verified metal AM suppliers running DMLS, SLM, binder jetting or DED, then requests quotes and lead times from every match at once. Getting matched is free for buyers.
Sourcing metal 3D printing
Metal additive manufacturing builds parts layer by layer from powder or wire, usually by melting each layer with a laser or electron beam. It earns its place where geometry is impossible to machine or cast — internal cooling channels, lattice structures, topology-optimised brackets, consolidated assemblies that used to be five welded pieces.
What it is not, usually, is a cheaper way to make a simple part. Powder is expensive, build time is measured in hours per part, and almost every printed metal part needs post-processing: stress relief, removal from the build plate, support removal, often HIP and machining of critical faces. Sourcing well means quoting the finished part, not the print.
Metal AM processes
Laser powder bed fusion (DMLS / SLM)
A laser melts fine metal powder layer by layer in an inert chamber. The dominant process: excellent detail, near-full density, and the widest alloy range — titanium, stainless, aluminium, tool steel, Inconel. Build envelopes are modest, and cost scales with part height and volume.
Binder jetting
A binder is printed into a powder bed and the green part is then debound and sintered. No melting means no support structures and far faster builds, so cost per part drops sharply at volume — but sintering shrinkage must be compensated, and properties differ from fully melted parts.
Other routes
- DED / laser cladding — deposits metal onto an existing surface; repair, hardfacing and large near-net shapes.
- Electron beam melting (EBM) — vacuum process with low residual stress; common for titanium implants.
- Wire arc AM (WAAM) — high deposition rate for large structural parts at coarse resolution.
- Metal filament / bound powder — low-cost entry for prototypes, sintered after printing.
What to specify when sourcing metal AM
Quotes hinge on alloy, part volume and — crucially — everything that happens after the print:
- Alloy — Ti6Al4V, 316L, AlSi10Mg, Inconel 718, maraging steel, CoCr.
- Part envelope — bounding box and orientation constraints; height often drives cost most.
- Tolerances — as-built accuracy is limited; state which features are machined afterwards.
- Surface finish — as-built Ra is rough; specify bead blasting, tumbling or polishing.
- Heat treatment & HIP — stress relief is near-universal; HIP if fatigue properties matter.
- Density & testing — required density, CT scanning, tensile coupons, material certificates.
- Quantity — one-off, bridge production or recurring series.
- Certifications — ISO 9001, AS9100 for aerospace, ISO 13485 for medical.
When metal AM beats machining or casting
Choose additive when the geometry cannot be made any other way, when consolidating an assembly removes joints and fasteners, when lead time matters more than unit cost, or when volumes are too low to justify tooling. If the part is a simple prismatic or rotational shape, machining is almost always cheaper. Describing the part rather than the process lets the agent surface AM suppliers and machine shops together when the trade-off is genuinely close.