SLA vs SLS: Which 3D Printing Technology Saves You Money?
Choosing between SLA and SLS affects your cost per part, surface finish, and mechanical performance. This data-driven comparison helps you decide, and connects you directly with verified suppliers for both technologies.
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When to Choose SLA
SLA (Stereolithography) excels at producing parts with exceptionally smooth surfaces and fine details. It's the go-to for visual prototypes, jewelry masters, dental models, and any application where surface finish matters more than mechanical strength. SLA parts are typically more brittle and UV-sensitive, making them less suitable for functional end-use parts.
When to Choose SLS
SLS (Selective Laser Sintering) produces strong, functional parts from nylon powder without support structures. This means complex geometries (interlocking parts, living hinges, internal channels) are all possible. SLS parts have a slightly rough, grainy surface but offer significantly better mechanical properties than SLA.
Technologies compared: SLA, SLS.
Bottom Line
Choose SLA for visual prototypes and fine details. Choose SLS for functional parts and production runs. SLS typically costs less per part at volumes above 10 units due to efficient powder packing.
Frequently asked questions
Is SLA or SLS cheaper per part?
For single prototypes, SLA is often cheaper. For batches above 10 parts, SLS becomes more cost-effective because parts can be densely packed in the powder bed without individual support structures.
Which has better surface finish: SLA or SLS?
SLA produces significantly smoother surfaces (Ra 1-2 µm) compared to SLS (Ra 6-12 µm). SLS parts can be smoothed through vapor polishing or dyeing, but won't match raw SLA quality.
Can SLS parts be used in production?
Yes. SLS PA-12 nylon parts are widely used in production applications including automotive, aerospace, and consumer goods. Many suppliers offer certified production-grade SLS.