Technologies
SLA (Stereolithography) 3D printing is an additive manufacturing process that uses a UV laser to cure liquid photopolymer resin layer by layer, building solid parts from the bottom up inside a vat. It
SLA (Stereolithography) 3D printing is an additive manufacturing process that uses a UV laser to cure liquid photopolymer resin layer by layer, building solid parts from the bottom up inside a vat. It delivers dimensional tolerances of ±0.1–0.2 mm and surface finishes as fine as Ra 0.8–1.6 µm, makin
SLA (Stereolithography) 3D printing is an additive manufacturing process that uses a UV laser to cure liquid photopolymer resin layer by layer, building solid parts from the bottom up inside a vat. It delivers dimensional tolerances of ±0.1–0.2 mm and surface finishes as fine as Ra 0.8–1.6 µm, making it the preferred method for high-detail prototypes and precision functional parts where accuracy and surface quality outweigh material strength requirements.
SLA printing transforms a digital CAD model into a finished physical part through a controlled sequence of resin curing and mechanical movement:
SLA resins fall into four functional categories, each engineered for distinct end-use requirements:
Standard photopolymer resin — The baseline material for general-purpose prototypes and visual mockups. Tensile strength ~65 MPa, rigid at room temperature, lowest cost per part. Best for architectural models, product design validation, and non-functional prototypes.
Engineering/tough resin — Formulated for functional parts that must withstand assembly, testing, or limited service cycles. Elongation at break ~30%, impact resistance 2–3× higher than standard resin. Used for mechanical assemblies, snap-fit fixtures, and living-hinge prototypes.
Castable resin — Designed for precision jewellery, dental crowns, and investment casting patterns. Burns out cleanly in a kiln without residue, enabling 1:1 metal casting of complex geometries. Allows fine detail reproduction down to 0.5 mm features.
Flexible resin — Elastomeric formulation with Shore A hardness 50–70, used for seals, gaskets, and wearable components that must bend or compress without fracturing.
At Entag, we stock standard and engineering-grade resins and can source specialty formulations within 48 hours of order placement, serving engineers across Cairo, Alexandria, Riyadh, Jeddah, and Dammam.
| Parameter | SLA | FDM | SLM (Metal) |
|---|---|---|---|
| Layer Thickness | 25–100 µm | 100–300 µm | 20–50 µm |
| Dimensional Tolerance | ±0.1–0.2 mm | ±0.3–0.5 mm | ±0.05–0.1 mm |
| Surface Finish (Ra) | 0.8–1.6 µm | 5–15 µm | 4–10 µm (as-built) |
| Common Materials | Photopolymer resins | PLA, ABS, PETG, Nylon | Ti6Al4V, 316L SS, AlSi10Mg |
| Best For | High-detail prototypes, patterns | Concept models, fixtures | Functional metal parts |
| Typical Lead Time (Entag) | 2–4 business days | 1–3 business days | 5–7 business days |
FDM excels at speed and material variety for rough concept work, but SLA dominates when mating surfaces, fine threads, or cosmetic finishes are non-negotiable. SLM is reserved for metal components requiring strength and thermal resistance that polymers cannot provide. See our detailed comparison: FDM vs SLA 3D printing.
SLA is standard in automotive prototyping shops across Cairo and Alexandria, where engineers use it to validate transmission housings and sensor brackets before CNC machining production tooling. In Riyadh and Jeddah, architectural firms specify SLA models for client presentations because the surface finish rivals hand-finished resin models at 1/3 the cost and lead time. Medical device manufacturers in Dammam and Cairo rely on SLA for biocompatible housing prototypes and custom surgical guides. Consumer product designers across both regions use SLA to iterate product forms, test human factors fitment, and create investment casting patterns for limited-run metal components.
What is SLA 3D printing used for?
SLA produces high-detail prototypes, product design mockups, dental and medical models, investment casting patterns, and functional engineering parts. Its ±0.1–0.2 mm tolerance and Ra 0.8–1.6 µm surface finish make it ideal when cosmetic quality or fine geometry matters more than material toughness. It is standard in automotive, medical device, and consumer product design workflows.
What is the difference between SLA and FDM 3D printing?
SLA cures liquid resin with a UV laser, producing smoother surfaces (Ra ~1 µm) and finer details than FDM, which extrudes melted thermoplastic filament. FDM is faster and cheaper for rough concept models. SLA is the better choice when accuracy, surface quality, or intricate geometry—such as threads, thin walls, or undercuts—is critical.
What materials are used in SLA 3D printing?
SLA uses photopolymer resins that harden under UV light. Common types include standard resin for prototypes, tough/engineering resin (elongation at break ~30%) for functional parts, castable resin for investment casting patterns, and flexible resin for snap-fit or wearable components. Each has distinct mechanical properties suited to different end-use requirements.
How accurate is SLA 3D printing?
SLA typically achieves dimensional tolerances of ±0.1–0.2 mm and layer thicknesses of 25–100 microns, making it one of the most accurate polymer additive manufacturing processes available. This precision suits detailed prototypes, fine-feature parts, and components that must fit or mate with precision-machined assemblies without rework.
How long does SLA 3D printing take?
Build time depends on part height, layer thickness, and platform density. Most standard SLA parts are completed in 2–4 business days at Entag, including UV post-curing and basic finishing. Complex or large parts may require additional time—upload your CAD file for an exact lead-time estimate and instant pricing.
Is SLA 3D printing available in Egypt and Saudi Arabia?
Yes. Entag operates SLA 3D printing facilities serving engineers and procurement teams across Egypt (Cairo, Alexandria) and Saudi Arabia (Riyadh, Jeddah, Dammam). Explore our 3D printing services or upload a CAD file to receive an instant online quote with DFM feedback, material recommendations, and confirmed lead time.
Ready to start your project? Request a quote on Entag — upload your CAD file and get a price in 24 hours.
