SLA Companies

SLA (VPP-SLA) is Vat Photopolymerization with Stereolithography — a laser cures liquid photopolymer layer-by-layer; high resolution and surface finish. AMPulse tracks 50 companies using SLA as a core technology, ranked below by total funding raised.

Typical materials: photopolymer resins, engineering resins, biocompatible resins. Common applications: dental models, jewelry casting, medical devices, high-detail prototypes.

Market structure

Stereolithography (SLA) is the foundational additive manufacturing process — Chuck Hull's 1986 patent created the modern 3D printing industry. The process uses an ultraviolet laser to selectively cure a liquid photopolymer resin layer by layer, building parts upside-down from a build platform that is raised slowly out of a resin vat. SLA produces parts with industry-leading surface finish (Ra below 2µm achievable) and dimensional accuracy (typically ±0.05mm), at the cost of slower throughput and higher material price relative to powder-based polymer processes. The market position has evolved sharply since 2015: what was once a single-vendor industrial market dominated by 3D Systems became fragmented when Formlabs democratized professional resin printing, and again when low-cost LCD-based vat photopolymerization made the technology consumer-accessible. Today SLA spans three distinct segments — dental and jewelry (high-margin professional), industrial prototyping and short-run production (mid-market), and consumer/maker (commodity).

Key players

At the industrial top end, 3D Systems (the original SLA inventor) and Stratasys (post-Origin acquisition) compete for production-grade applications. Carbon brought CDLP/CLIP technology to mid-volume polymer production, with Adidas Futurecraft as the flagship reference. Formlabs (Boston, valued at over $2B) commands the prosumer professional market with the Form 4 line. EnvisionTec, now part of Desktop Metal, targets dental and jewelry workflows. The DLP and LCD subcategories — Anycubic, Elegoo, Phrozen, Prusa SL1 — have largely won the consumer segment with sub-$500 desktop machines. A specialized tier serves dental aligners and clear-aligner production (Stratasys Origin, 3D Systems NextDent, SprintRay, Asiga); collectively this is the highest-revenue-per-unit application of any AM process today.

Recent dynamics

Three forces are reshaping the SLA landscape. First, dental aligners continue their hyperbolic growth — Align Technology alone consumes more SLA-printed resin annually than all other industrial applications combined. Second, the SLA-DLP-LCD distinction is blurring as light engines mature; what was three categories is becoming a continuum. Third, post-cure chemistry and resin formulation have become competitive levers more important than print mechanics: Carbon and Stratasys differentiate primarily on cure kinetics and post-cure mechanical properties. Resin chemistry vendors (Henkel, BASF, Liqcreate, Tethon 3D) increasingly capture margin previously held by printer OEMs.

Forward outlook

SLA will likely bifurcate further. The high end (Carbon, Stratasys industrial, dental specialists) moves toward production-grade economics with proprietary resin-printer co-engineering. The low end (LCD) becomes a pure hardware commodity where margin shifts almost entirely to resin and post-processing. The middle tier — currently anchored by Formlabs — faces the most pressure as both ends compress toward it.