FDM is the most accessible 3D printing method, but it is not universal. If you need fine detail, a smooth surface or a strong part without visible layers, consider SLA or SLS.
SLA: printing from resin
In SLA printing, liquid photopolymer resin is cured by UV light, layer by layer. The surface is smooth and the details are much finer than with FDM.
SLA suits detailed models, presentation samples, small components and anywhere appearance matters. Resin parts tend to be more brittle than parts made of tough plastics, so they are not suitable for heavy mechanical loads.
SLS: sintered nylon powder
In SLS, a laser sinters fine nylon powder. During printing, the surrounding powder holds the part in place, so no supports are needed. This makes it possible to produce complex shapes, internal cavities and assemblies that would need laborious supports with FDM or SLA.
Nylon parts are mechanically strong and tough, so they suit functional components and small series. The surface is finely grainy.
Comparison
| FDM | SLA | SLS | |
|---|---|---|---|
| Materials | PLA, PETG, ABS, TPU and others | Photopolymers (resins) | Nylon (PA12) |
| Supports | Needed | Needed | Not needed |
| Surface | Visible layers | Smooth | Finely grainy |
| Best for | Prototypes, larger parts | Detail, appearance | Strength, complex shape |
How to decide
- A quick, affordable prototype or a larger part: FDM.
- Detail and a smooth surface: SLA.
- A strong part with a complex shape: SLS.
At MATERIA we work with all three technologies, so we recommend the one that fits your project, not the one we happen to have available.
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