Projector-based SLA

Projector-based Stereolithography (PSLA), is a resin-based additive manufacturing process that builds parts by selectively curing liquid photopolymer resin using projected light. A digital projector displays a two-dimensional image of each layer onto the surface of a resin vat. The exposed regions polymerize (harden), forming one solid layer. The build platform then moves, fresh resin flows into place, and the next layer is projected. This sequence repeats until the part is complete.

Whereas traditional Stereolithography (SLA) traces each layer point by point, PLSA cures an entire layer in a single exposure. This reduces build time, especially for larger cross-sections. Parts produced with PSLA can print fast, with extremely smooth surfaces and fine feature details.

Whereas projector or LCD-based systems typically use a flexible membrane, with each layer cured against this membrane and parts built hanging inverted, PLSA systems build parts right-way up on a membrane-free platform within the vat. This can reduce peeling forces, improve reliability at larger build scales and allow for more consistent curing of larger cross-sectional areas.

PSLA is commonly used for functional prototyping, manufacturing aids such as jigs and fixtures, wind tunnel models, patterns for investment casting, tooling components and limited-volume production parts. PSLA systems are often selected when fine surface features are required, moderate to large part sizes are needed, high feature accuracy is important and where resin material properties, including production-capable mechanical properties are key to the application requirement.

PSLA Material Properties & Uses

PSLA materials offers a wide range of high-performance, production-grade resins engineered for durability, precision, and long-term stability. Each material delivers specific advantages—rigid composites like Figure 4 Rigid Composite White provide exceptional stiffness and surface finish for aerodynamic models; high-temperature materials such as Figure 4 Hi Temp 300 AMB withstand over 300 °C for thermal testing and tooling; and flame-retardant plastics like Figure 4 Tough FR V0 Black ensure safety and reliability in end-use parts. Flexible options like Figure 4 FLEX BLK 20 and sacrificial materials such as Figure 4 Eggshell AMB 10 enable complex geometries, elastomeric casting, and carbon fiber tooling. Biocompatible and impact-resistant formulations, including Figure 4 Tough 60C White.

Rigid

Similar aesthetics and properties to injection-molded ABS.

Tough and Durable

Look and feel of polypropylene.

High Temperature

Heat deflection temperatures up to over 215˚C (419°F) offering exceptional performance under extreme conditions.

Castable

Expendable resins specifically formulated for QuickCast^® sacrificial patterns for investment casting.

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Biocompatible

Engineered to safely interact with living tissue, enabling the creation of medical devices, implants, and surgical models that meet health and regulatory standards.