Choosing the right printing technology is the first – and often most consequential – decision in any product development project. A wrong choice means parts that miss requirements, inflated costs and long lead times. This article presents a simple methodology for the decision.
The first four questions
- What is the part’s function – visual, functional, or end-use?
- What are the accuracy and finish requirements?
- Which material is required – standard plastic, engineering, or metal?
- How many units, and on what timeline?
Matching technology to requirements
SLA – accuracy and visual finish
SLA (stereolithography) suits visual prototypes, marketing models, casting patterns and Vacuum Casting masters. Accuracy down to ±50µm and an exceptionally smooth finish. Drawback: relative brittleness and limited UV resistance.
SLS and MJF – mechanical strength with no supports
SLS (nylon powder) and MJF (Multi Jet Fusion) are made for functional parts, complex mechanisms and end-use applications. No supports needed, enabling fully free geometries. MJF delivers higher throughput and a denser finish.
FDM – cost-effective and large
FDM is the right pick for very large parts (over 500 mm), jigs & fixtures for production lines, or specialty engineering materials like ULTEM and PEEK. Layer lines are more visible, but per-unit cost is low.
SLM – fully dense metal
When the requirement is a true metal part – titanium, aluminum, steel or Inconel – SLM is the technology. Main uses: aerospace components, medical implants and industrial parts with high thermal demands.
Common mistakes
- Picking FDM for a visual part – layer lines wreck the look.
- Using SLA for a functional load-bearing part.
- Jumping to SLM before the geometry has stabilized.
Summary
No single 3D printing technology wins on every metric. The right method is the one that matches your specific function, batch size and budget. If you’re undecided – talk to us before you start the file.