Precision 3D Printed Parts with High Accuracy Parts and Exceptional Surface Finish
Stratasys Stereolithography (SLA) technology is an advanced resin-based vat 3D printing process that delivers outstanding dimensional accuracy, exceptional detail resolution and smooth surface finishes. It uses a precision UV laser to selectively cure liquid photopolymer resin layer-by-layer. SLA produces parts with fine features and excellent aesthetics that are difficult to achieve using other additive manufacturing technologies.
From engineering prototypes and dental models to casting patterns and master tools, Stratasys SLA systems provide a reliable solution for applications where surface quality, precision and repeatability are critical.
How Stratasys SLA Technology Works
The SLA process begins with a vat of liquid photopolymer resin and a build platform positioned just below the resin surface.
The workflow follows a precise sequence:
- A UV laser traces the cross-section of the part, selectively curing the resin
- The cured layer solidifies and adheres to the build platform
- The platform moves incrementally up, allowing fresh resin to cover the newly formed layer
- The laser cures the next layer onto the previous one
- The process repeats until the complete part is produced
- Finished components are cleaned, post-cured and any support structures removed
Because the laser precisely scans each layer, SLA is capable of producing extremely fine details, sharp edges, and smooth surfaces with outstanding dimensional accuracy.
The process is similar to the P3-DLP process [[ADD LINK]], which uses a digital light projector to polymerise a full layer at a time.
Key Benefits of Stratasys SLA 3D Printing
- Exceptional Surface Finish – SLA produces some of the smoothest surfaces available in additive manufacturing, making it ideal for presentation-quality models and customer-facing prototypes
- High Dimensional Accuracy – The precision laser curing process enables excellent tolerances and repeatability, supporting demanding engineering and manufacturing applications
- Fine Feature Resolution – Thin walls, small holes, sharp text and intricate geometries can be produced with outstanding detail
- Large Build Volumes – Stratasys Neo systems support large-format printing, enabling oversized prototypes, tooling and production aids to be manufactured in a single build
- Isotropic Mechanical Properties – Unlike some additive manufacturing technologies, SLA parts exhibit highly consistent properties throughout the part structure
- Reduced Product Development Time – Rapid fabrication of accurate prototypes allows engineers and designers to validate concepts, fit, form and function before investing in tooling.
Stratasys SLA Materials
Stratasys offers a broad portfolio of high-performance photopolymers developed for a wide range of applications and performance requirements.
Available material categories include:
- General purpose prototyping resins
- High-temperature materials
- Tough and durable engineering resins
- Fast-build production resins
- Investment casting materials
- Medical and dental materials
- Transparent and translucent materials
- Composite-filled photopolymers
The extensive material range allows users to match the performance requirements of their application while maintaining high part quality and accuracy.
Applications of Stratasys SLA Technology
- Engineering Prototypes – Produce highly accurate prototypes for design validation, form and fit assessment, assembly testing and customer demonstrations
- Investment Casting Patterns – Create precise patterns for metal casting without the need for traditional tooling, reducing lead times and development costs
- Wind Tunnel Models – Manufacture smooth, dimensionally accurate aerodynamic models suitable for testing and development
- Manufacturing Tooling – Produce jigs, fixtures, moulds and production aids quickly and cost-effectively
- Medical and Healthcare Models – Generate anatomical models, surgical planning aids and medical device prototypes with exceptional detail
- Dental Models – Manufacture highly accurate dental models, aligner moulds, surgical guides and restorative components
- Master Patterns – Create master patterns for silicone moulding, vacuum casting and other replication processes.
Industries Using Stratasys SLA
- Aerospace – Develop highly detailed concept models, aerodynamic test components and manufacturing tool
- Automotive – Accelerate product development through rapid prototyping, ergonomic assessment and design validation
- Consumer Products – Evaluate aesthetics, ergonomics and functionality before moving to production tooling
- Medical and Dental – Produce precision healthcare models and custom device prototypes
- Manufacturing – Create tooling, fixtures and production aids that improve manufacturing efficiency and reduce costs
- Education and Research – Support engineering, scientific and product development programmes requiring highly accurate physical models.
Why Choose Stratasys SLA?
Stratasys SLA systems combine decades of additive manufacturing expertise with advanced laser technology and industry-leading reliability.
Key advantages include:
- Industrial-grade build quality
- Excellent repeatability and consistency
- Large-format printing capability
- Extensive material portfolio
- High productivity workflows
- Proven performance in demanding industries
- Professional software ecosystem and support
The Stratasys Neo series has become a preferred solution for organisations requiring consistent, high-quality parts with exceptional surface finish and accuracy.
SAM vs Other 3D Printing technologies
SLA vs FDM
FDM builds parts by extruding melted thermoplastic filament layer-by-layer.
Choose SLA when:
- Surface finish is critical
- Fine details are required
- High dimensional accuracy is needed
- Presentation-quality models are important
Choose FDM when:
- Larger functional components are required
- Thermoplastic material properties are essential
- Lower production costs are prioritised
- Manufacturing jigs and fixtures are the primary application
SLA vs PolyJet
Both technologies utilise photopolymers but differ significantly in how material is deposited and cured.
Choose SLA when:
- Larger parts are required
- Lower operating costs are important
- Strong, accurate single-material components are needed
Choose PolyJet when:
- Multi-material capability is required
- Full-colour printing is needed
- Ultra-fine feature reproduction is critical
- Complex overmoulding simulation is desired
SLA vs P3™ DLP
Both technologies belong to the vat photopolymerisation family but utilise different curing approaches.
SLA uses:
- A scanning UV laser
- Excellent accuracy over large build areas
- Proven industrial workflows
- Large-format fabrication capability
P3™ DLP uses:
- Digital light projection
- Higher productivity in many applications
- Exceptional repeatability
- Advanced engineering-grade materials
- Manufacturing-focused workflows
Choose SLA when: large, highly accurate components and exceptional surface quality are the priority.
Choose P3-DLP when: production throughput, repeatability and engineering-grade end-use parts are the primary requirements.
Stratasys Neo SLA Printers
The Stratasys Neo range combines advanced stereolithography technology with intelligent software and robust industrial design to deliver exceptional print quality and productivity.
Benefits of the Neo platform include:
- Large build envelopes
- High-speed scanning technology
- Consistent part quality
- Intuitive workflow management
- Low maintenance requirements
- Broad material compatibility
- Exceptional reliability for professional environments
These systems are ideally suited to engineering departments, service bureaus, manufacturers, research organisations and healthcare providers seeking high-quality additive manufacturing solutions.
Discover Stratasys SLA Technology
Whether you need highly detailed prototypes, manufacturing tooling, casting patterns or presentation-quality models, Stratasys Stereolithography technology provides the precision, surface finish and reliability required for demanding professional applications.
Contact AXT today to discuss your application requirements or arrange a demonstration of Stratasys SLA technology.