Compare SLS Materials by Job, Not by Name
SLS material comparison starts with function. A display prototype, snap-fit housing, wearable brace, shop fixture, flexible gasket, and impact-prone clip each need different behavior. The best material is the one that handles the load, environment, finish, and cost target.
Compare SLS Materials by Job, Not by Name
SLS material comparison starts with function. A display prototype, snap-fit housing, wearable brace, shop fixture, flexible gasket, and impact-prone clip each need different behavior. The best material is the one that handles the load, environment, finish, and cost target.
The common polymer SLS choices include PA12, PA11, glass-filled or mineral-filled nylons, TPU-like flexible powders, and specialty materials. Availability depends on the printer ecosystem or service bureau.
PA12
PA12 is the default workhorse for many SLS projects. It offers a strong balance of toughness, dimensional stability, surface finish, and availability. Use it for housings, brackets, clips, ducts, fixtures, and prototypes where no extreme property dominates.
Its predictability makes it a good first choice. If PA12 fails, the reason usually points to a specific need: more ductility, more stiffness, more heat resistance, more flexibility, or a design change.
PA11
PA11 is often chosen for ductility and impact resistance. It is useful for parts that flex, snap, bend, or absorb impact. Wearables, protective parts, clips, and ergonomic components may benefit from PA11’s behavior.
The tradeoff is cost and availability. PA11 is valuable when the added ductility solves a real problem, not when PA12 would already perform well.
Filled Nylon
Glass-filled and mineral-filled nylons increase stiffness, thermal behavior, or dimensional feel. They are useful for fixtures, housings, brackets, and parts that need a more rigid structure.
Filled materials can be less flexible and may not suit snap features or living hinges. They also may have different surface and finishing behavior. Use them when stiffness is more important than bend.
Flexible Powder
TPU-like SLS powders create flexible components such as grips, cushioning, seals, lattice pads, and wearables. They bring powder-bed geometry freedom to soft parts without fighting flexible filament through a desktop extruder.
Flexible SLS parts need careful design around wall thickness, cleaning, rebound, and compression. The material must be tested under the exact motion or pressure the part will see.
How to Decide
Choose PA12 for general functional nylon parts, PA11 for impact and ductility, filled nylon for stiffness, and flexible powders for elasticity. Then check finish, cost, supplier support, and whether the material has the documentation needed for the application.
For production, order samples in the final finish. Dyeing, tumbling, sealing, and vapor smoothing can change appearance, feel, and sometimes fit. Material comparison is not finished until the part is tested as delivered.
FAQ
What is the most common SLS material?
PA12 nylon is the most common all-around polymer SLS material.
When is PA11 better than PA12?
PA11 is usually better when ductility, impact resistance, or flex behavior matters more than general stability.
Can SLS print flexible materials?
Yes. TPU-like SLS powders can produce flexible parts, but design and cleanup need careful planning.
