SLA vs SLS 3D Printing: Which Technology Should You Choose?

Both SLA and SLS are widely used 3D printing technologies, but they work very differently and serve different purposes. Here's how to decide:

How They Work

SLA (Stereolithography) uses a UV laser to cure liquid resin layer by layer. The result is extremely high resolution and smooth surface finish.

SLS (Selective Laser Sintering) uses a laser to fuse nylon powder. Parts emerge from the powder bed fully solid — no support structures needed.

Key Comparisons

Factor	SLA	SLS
Resolution	★★★★★ Extremely high	★★★★ Good
Surface finish	★★★★★ Smooth, glossy	★★★ Slightly rough, powdery
Strength / Durability	★★★ Rigid, brittle-ish	★★★★★ Tough, flexible nylon
Heat resistance	★★ Low (standard resin)	★★★★ High (nylon ~180°C)
Water/chemical resistance	★★ Poor (standard resin)	★★★★ Good
Support structures	Required	Not needed (self-supporting)
Material cost	Medium	Medium

When to Choose SLA

• You need high detail and smooth surfaces — ideal for concept models, jewelry, dental
• You're printing clear or translucent parts
• You need very tight tolerances — SLA achieves ±0.1mm or better
• You're doing vacuum casting — SLA patterns pull cleanly from silicone

When to Choose SLS / MJF

• You need functional, durable parts — brackets, hinges, enclosures
• You need heat or chemical resistance
• Your design has complex geometry that would need heavy support in SLA
• You're producing low-volume batches — SLS is more cost-effective at 10+ units

Can't Decide? Let Us Help

PrintVX's engineering team reviews every order and recommends the best technology for your specific application — often saving 30-50% compared to the technology a customer initially requested. Upload your design for a free DFM review and quote.