Process comparison · Process and manufacturing decisions
FDM or SLA: choosing for functional parts and precision models
SLA polymerises liquid resin with light and achieves fine detail and smooth surfaces. FDM extrudes thermoplastics and offers a broad range of engineering materials. Required function matters more than visible resolution.
In brief
SLA often suits fine models, small channels and high-quality visual samples. FDM often suits larger, loaded and material-specific functional parts. Manufacturer data for the actual material remains decisive.
Detail and surface
Resolution is only one part of component quality.
- FDM
- Visible layers and roads; nozzle geometry limits small details
- SLA
- Fine detail and smooth surfaces; consider support marks and cleaning
Material and use
Resin labels and thermoplastic names are not directly comparable material classes.
- Check temperature, media contact, UV and sustained load against actual datasheets.
- Post-curing can influence SLA properties and dimensions.
- FDM properties depend strongly on orientation and layer adhesion.
Decision questions
The right choice starts with the application, not the process.
- Is surface or mechanical function more important?
- Which media and temperatures occur in reality?
- Is the sample only for evaluation or permanent use?