The smoothest surface 3D printing can deliver. 50 µm resolution.

Stereolithography (SLA) uses a UV laser or DLP projector to selectively cure liquid photopolymer resin layer by layer. Each layer bonds to the one below, building up a solid part. SLA produces the smoothest surface finish and highest detail of any 3D printing technology — suited to cosmetic prototypes, master patterns, and visual concept models.

For visual prototypes: Standard resin (cheap, detailed). For mechanical/functional: Tough resin (ABS-like impact resistance). For loaded fixtures: Rigid resin (10K psi modulus). For engine/under-hood: High Temp resin (HDT 238°C). For compliant parts: Flexible Shore A 70. For optical/clear: Clear resin (polished transparent). For medical: Biocompatible Class VI. For investment casting: Castable resin (burns clean).

Minimum feature size ~0.3 mm. Layer thickness 25, 50 or 100 µm selectable. Pixel size on DLP systems 50–75 µm. Small text (2 mm letters), fine textures, grain patterns and smooth transitions all print faithfully. SLA is the technology of choice for jewelry masters, dental aligners, and high-end cosmetic models.

Single-piece builds up to 380 × 284 × 380 mm on our large-format industrial SLA systems. Larger parts can be printed in sections and bonded with matching resin — the bonded seam is nearly invisible.

Standard SLA resins are brittle — they shatter rather than bend. Tough resins (ABS-like) survive most functional testing. Engineering resins (rigid 10K, high-temp) work for loaded fixtures and high-temperature applications. For truly durable functional prototypes, MJF or SLS nylon is more appropriate. UV exposure weakens most SLA parts over months, so for long-term functional use, coat with UV-resistant lacquer.

Yes. Formlabs BioMed Clear (USP Class VI, skin contact, short-term implantable) and Dental LT Clear (Class IIa). For longer-term implantable or patient-contact devices, consult our engineers on appropriate material and regulatory path.