SLA vs FDM: Which 3D Printing Process Is Best for Your Prototype?
Choosing between SLA and FDM sets the tone for your prototype’s performance, aesthetics, and budget. Deciding which technology fits your goals—whether that’s visual polish or functional reliability—means balancing surface quality, material characteristics, cost, and turnaround time.
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Core Technology Comparison
SLA (Stereolithography)
- Cures liquid resin layer by layer using UV light (laser, DLP projector, or masked LCD).
- Delivers incredibly fine detail, uniform surface finish, and tight dimensional accuracy, with parts resembling injection-moulded aesthetics.
- Often used for visual presentation models, dental components, and complex small assemblies.
FDM (Fused Deposition Modeling)
- Builds parts by extruding melted thermoplastic filament through a moving nozzle.
- Well-suited for larger, mechanically functional prototypes, assembly checks, and basic mechanical testing.
Prototyping Purpose: When to Use Each
Choose FDM when:
- Speed and cost-efficiency are priorities.
- You need prototypes for mechanical testing, fit, or form.
- Durability or material representativity matters—FDM supports functional thermoplastic materials.
Choose SLA when:
- Visual polish, fine features or surface detail is critical.
- High precision or dimensional fidelity is required.
- You’re prototyping cosmetic parts, dental models, or highly detailed components.
Quick Comparison Table
| Feature | SLA | FDM |
|---|---|---|
| Surface Finish | Smooth, mould-like | Layer lines visible |
| Detail & Accuracy | High precision (tight tolerances) | Lower resolution; coarser features |
| Material Strength | Brittle thermoset resin | Robust thermoplastic suitable for functional use |
| Speed & Cost | Higher cost, slower | Faster, low-cost prototyping |
| Scale & Size | Better for small, detailed parts | Ideal for larger or structural prototypes |
Practical Workflow Insight
A proven strategy:
- Start with SLA to validate aesthetics and refine detailed features.
- Switch to FDM for functional prototypes that test assembly, stress, or movement.
This hybrid workflow supports rapid iteration while maintaining design integrity and realism.
Final Recommendations
- Use SLA for presentation models, small parts with fine features, or when dimensional accuracy is key.
- Choose FDM if mechanical performance, material longevity, or budget-sensitive testing is important.
- Need both? A combined approach helps you speed up development and preserve high visual and physical performance where needed.
Want help determining the best fit for your specific prototyping goals or applications? I’m happy to guide you further!
Contact us today to discuss your requirements and receive a personalized quote.