SLA and SLS can both produce useful prototypes, but they solve different design problems. Choose the process around the intended evaluation rather than the appearance of a material name.
When surface detail is the priority
SLA uses light to cure liquid photopolymer. It is often considered for detailed presentation models and fit checks. Discuss visible surfaces, support locations and post-processing. Resin selection matters: a visually convincing part should not automatically be treated as equivalent to an injection-molded thermoplastic.
When a polymer powder process fits
SLS builds parts from polymer powder. Surrounding powder supports the build, so attached support structures are generally unnecessary. Internal spaces still need a way to remove powder. Review texture, wall geometry, access for cleaning and any mating interfaces.
Compare the complete requirement
State the load, temperature, exposure and duration of the intended test. Ask about the specific material rather than comparing process names alone. Painting, inserts, sanding or secondary operations can change the manufacturing route and the acceptance checks.
Use a small evaluation build
For an uncertain fit or tactile requirement, consider a representative test feature before a larger order. Record orientation, material and finishing with the evaluation. Published design guidance is a starting point; achievable details and delivery need a project-specific review.
Discuss your project
Share your model, drawing revision, quantity and application with Winston Rapid. Material availability, manufacturing feasibility, inspection requirements and delivery are confirmed during quotation.
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Further technical reading: Protolabs introduction to SLS. External guidance describes its publisher’s processes, not Winston Rapid specifications.