DELIVERED
8M+
Parts manufactured and delivered globally across rapid prototyping and production projects.
CUSTOM ONLINE 3D PRINTING SERVICE
Rapid 3D Printing.Prototypes to Parts Production.
Partner with China's largest 3D printing service provider for instant quotes, industrial-grade quality, and fast turnaround—from rapid prototyping to low-volume production.
Upload Your File. No Login Required
STEP, STL, IGES, OBJ and more. We'll route your part to the right process before production starts.
Get 3D Printing Instant Quote
No MOQ • ISO 27001 Certified • Free DFM Review • 10% Off First Order
Excellent4.7 out of 5
TECHNOLOGIES & MATERIALS
80+ / 7
80+ engineering materials supported across 7 advanced manufacturing technologies.
LEAD TIME
24HRS
Fast-turn production with parts ready in as fast as 24 hours.
CERTIFIED
ISO
ISO 9001, 14001, 13485 & IATF 16949 certified with NDA-secured manufacturing workflows.
Applications of 3D Printing
Unionfab provides industrial-grade 3D printing services for engineers, product designers, and manufacturers worldwide.
- Functional Parts:Structures, housings, end-use components, and tooling or jigs and fixtures in aerospace, automotive, robotics, medical devices, and industrial machinery; on-demand replacement parts, etc.
- Rapid Prototyping:Aesthetic and concept models; functional test and engineering validation samples; touch and grip samples; vacuum casting master molds; fit-check and assembly prototypes, etc.
- Specialized Models:Pre-surgery practice models; high-fidelity display models; intricate architectural models; and functional high-end collectibles and prop masters, etc.
Why Choose Unionfab for 3D Printing?
- Integrated R&D Ecosystem (Hardware, Materials & Software):Self-developed 3D printers (SLM and SLA), high-performance materials (polymers and metals), and proprietary software for unmatched precision and performance.
- High-Difficulty Project Engineering:Dedicated R&D experts tackling non-standard challenges: complex geometries, ultra-large scales, and tight tolerances.
- Scalable Capacity with Tier-1 Equipment:6 self-owned factories (3,000+ daily orders), powered by EOS, Stratasys, HP, BLT, Farsoon, UnionTech (self-developed), and Bambu.
- Premium Quality at Competitive China Pricing:Premium 3D printing at up to 50% off for polymers and 70% off for metals compared to European and U.S. alternatives.
- Full-Scale Manufacturing (From 1 to 1,000,000):Seamless manufacturing from prototype to mass production, covering 3D printing, CNC, vacuum casting, and advanced post-processing.
- Instant Quoting & Free DFM Analysis:AI-driven 24/7 instant quotes and expert DFM optimization to ensure manufacturability from the start.
Why should you work with Unionfab?
Unionfab — China's Largest 3D Printing Service Provider
Born from UnionTech—a world-class innovator in 3D printing equipment, materials, and software R&D—Unionfab has evolved into China's premier one-stop digital manufacturing platform over the past 20 years.
Operating 6 smart factories, we offer a full spectrum of technologies—SLA, SLS, SLM, MJF, FDM, PolyJet, and Binder Jetting, covering 80+ high-performance polymers and metals and providing comprehensive solutions from rapid prototyping to small-batch production, integrated with professional post-processing services.
At Unionfab, we don't just print parts: we provide high-performance, cost-efficient manufacturing certainty, ensuring your most complex designs move from concept to reality at unprecedented speed.
800+
Industrial 3D Printers
2M+
Parts Annually
170+
Countries Covered
3,000+
Orders Daily
Industrial 3D Printing Technology
Unionfab offers a wide range of industrial additive manufacturing technologies to meet different requirements in strength, accuracy, surface finish, and production scale.
Selective Laser Melting (SLM)
Best for: Functional Automotive, Aerospace, and Medical parts
Lead Time: 5-7 days
Functional PartsNo Support
Stereolithography (SLA)
Best for: High-resolution prototypes, Large Scale and Transparent models
Lead Time: 1-3 days
High DetailSmooth Surface
_charging_inlet_component.png?x-oss-process=image/format,webp/quality,Q_85)
Selective Laser Sintering (SLS)
Best for: Functional prototypes, Complex structures, Small batch production
Lead Time: 3-4 days
Functional PartsNo Support
.png?x-oss-process=image/format,webp/quality,Q_85)
Digital Light Processing (DLP)
Best for: Small resin prototypes, Fine features
Lead Time: 2-3 days
High ResolutionFine Details
Fused Deposition Modeling (FDM)
Best for: Cost-effective functional part production, Large-scale parts
Lead Time: 3-5 days
Cost-EffectiveFast Prototyping
Multi Jet Fusion (MJF)
Best for: High precision parts, Production-grade plastic parts, Durable components
Lead Time: 3-4 days
Production ReadyHigh Efficiency
PolyJet
Best for: Multi-color parts, High detail models, Product appearance prototypes
Lead Time: 1-3 days
Multi-colorHigh Detail
Binder Jetting (BJ)
Best for: Cost-effective metal production
Lead Time: 5-7 days
Cost-Efficient
See Seven Processes on One Capability Map
High Performance
Low Cost
Rough / Large Scale
Ultra-Precision / Fine Detail
FDM
Large engineering-grade parts in ABS, PC, and PEEK where size and material performance matter more than fine surface finish.
Selection of 3D Printing Materials
Unionfab supports a wide range of engineering-grade materials for different industrial applications.
Plastic 3D Printing Materials
Resin
Ideal for projects that require exceptional detail and smooth surface finishes, resin materials are widely used for visual prototypes and precision components.
Best for: High detail, smooth surface, visual prototypes
Materials:
Metal 3D Printing Materials
Stainless Steel
A versatile and cost-effective metal material offering excellent strength, corrosion resistance, and reliable mechanical performance across a wide range of industrial applications.
Best for: Functional parts, tooling, and general industrial components
Materials:
Choose the Best Material for Your Project
Compare materials, priorities, and production quantities to identify the ideal 3D printing solution for your part.
Step 1
Material
Step 2
What matters most
Step 3
Quantity
SLA
High-detail resin printing for smooth surface finish and crisp small features.
±0.1 mm1-3 daysVisual prototype
PolyJet
Use when color, soft-hard textures, or lifelike prototype realism matter more than standard resin economics.
±0.1 mm3-5 daysMulti-material presentation
Not sure which material or finishing option is right for your project?
Upload your CAD file and our engineers will recommend the best solution.
Upload Your File to Get an Instant Quote3D Printing Tolerances & Accuracy Guide
| Technology | Standard Tolerance | Max Part Size | Layer Thickness |
|---|---|---|---|
| SLA | ±0.1 mm (≤100 mm); ±0.1% (>100 mm) | 2100 mm x 700 mm x 800 mm | 0.1 mm |
| SLS | ±0.3% (with a lower limit of ±0.3 mm) | 400 mm x 400 mm x 450 mm | 0.1 mm |
| MJF | ±0.3% (with a lower limit of ±0.3 mm) | 380 mm x 280 mm x 380 mm | 0.08 mm |
| FDM | / | 1000 mm x 610 mm x 610 mm | 0.178 mm~0.508 mm |
| SLM | ±0.2 mm | 800 mm x 800 mm x 700 mm | 0.35 mm |
| PolyJet | / | 500 mm x 400 mm x 200 mm | 0.014 mm |
* Tolerances may vary depending on part geometry, material, and build orientation.
Larger parts may experience slightly greater deviation due to thermal stress and shrinkage.
3D Printing Surface Finishing
Enhance the appearance, performance, and functionality of your parts with our professional 3D printing surface finishing options. From aesthetic improvements to functional coatings, we provide solutions tailored to your application needs.
- Sanding & Polishing: Smooths layer lines and enhances surface quality for a refined, high-end appearance.
- Vapor Smoothing: Creates a glossy, sealed surface with improved strength and near injection-molded finish.
- Painting: Applies custom colors and coatings to enhance aesthetics and brand identity.
- Bead Blasting: Produces a uniform matte texture while removing surface imperfections.
- Anodizing (Metal): Improves corrosion resistance and durability while adding optional color finishes to metal parts.
- Plating: Adds a protective metallic layer to enhance strength, conductivity, and appearance.
- Powder Coating: Provides a durable, wear-resistant finish with excellent coverage and consistency.
Quality Control Throughout the 3D Printing Process
From file review to final inspection, every part is verified to meet your specifications.
Confidentiality Assurance:We prioritize the security of your designs and intellectual property. Non-Disclosure Agreements (NDAs) can be signed upon request, and all files are handled with strict confidentiality throughout the entire production process.
Expertise & Inspection Capabilities:Equipped with advanced inspection tools such as CMMs, 3D scanners, digital calipers, and material testing systems, we ensure precise dimensional accuracy and reliable performance for every printed part—from prototypes to production runs.
Process Control:Quality is embedded in every stage of our additive manufacturing workflow—from file analysis and build preparation to printing, post-processing, and final inspection. Standardized procedures and real-time monitoring help minimize deviations and ensure consistent, repeatable results.
Traceability & Reliability:Every order is fully traceable, with documented records covering material batches, printing parameters, and inspection results. This transparent workflow ensures consistent quality and gives customers full confidence in every delivered part.
For more details on our quality standards, check out our Inspection Checklist (including both standard and premium options).
Advantages of 3D Printing
Design Freedom: Create complex geometries and internal structures that are impossible with traditional manufacturing.
Rapid Prototyping: Quickly transform digital designs into physical parts, accelerating product development cycles.
No Tooling Required: Eliminate expensive molds or tooling, reducing upfront costs and enabling faster project starts.
Low-Volume Production: Cost-effective for prototypes and small-batch manufacturing without the need for mass production.
Customization & Personalization: Easily produce customized parts, tailored components, and one-off products.
Material Efficiency: Additive manufacturing uses only the material required for the part, reducing waste.
Fast Iteration: Design changes can be implemented quickly without retooling or production delays.
Challenges of 3D Printing
Limited Surface Finish: Some printing technologies require post-processing to achieve smoother surfaces.
Size Constraints: Build volume limits the maximum size of parts depending on the printer.
Material Limitations: Not all engineering materials are currently available for 3D printing.
Mechanical Anisotropy: Parts may have different strength properties depending on the printing direction.
Slower for Mass Production: Traditional manufacturing methods may be more efficient for very high production volumes.
Post-Processing Requirements: Support removal, curing, machining, or finishing may be required after printing.
FAQ's about 3D Printing
At Unionfab, we support a wide range of 3D file formats to ensure smooth compatibility with our manufacturing systems. The most commonly recommended formats are STEP (.stp/.step) and STL (.stl). If your design is in another format (such as IGES, OBJ, or others), it can usually be processed as well, but we suggest converting it to STEP or STL for the best results. These formats help preserve critical design details and ensure a more accurate and stable printing outcome.
Typically, many standard 3D printing orders are completed within 1-3 business days. However, the exact lead time depends on the part's size, complexity, material, and quantity. For a precise timeline, we recommend uploading your design files so our team can provide a detailed estimate based on your specific requirements.
The formula below encompasses all cost components involved in an industrial 3D printing quote:
Total Cost = Printing Cost (Material Unit Price × Part Weight) + Complexity Surcharge + Post-Processing + Packaging + Shipping + Customs Duty
For detailed explanation of the cost items above, you can refer to our 3d printing cost guide.
At Unionfab, we ensure quality through a strict end-to-end control process. This includes file checks before production, process monitoring, and final inspection to verify part accuracy and consistency. We can also provide inspection reports or additional quality checks upon request, and our facilities follow recognized quality standards to ensure reliable results. If your project has specific quality requirements, our team will work closely with you to define and meet those standards.
Absolutely. We understand the importance of your intellectual property. Unionfab follows strict data security protocols. We are happy to sign a Non-Disclosure Agreement (NDA) before you upload your files. Our internal platform is encrypted, ensuring that your designs are only accessible to the essential technical team involved in your project.
Unionfab isn't just a service provider; we are your manufacturing partner. Our Online Knowledge Base and expert engineers can provide material recommendations based on your part's application (e.g., heat resistance, strength, or flexibility).
Once your order is placed, you can monitor the entire production progress in real-time through your Unionfab User Dashboard - from "In Production" to "Quality Inspection" and "Shipped."
Ready to Start Your 3D Printing Project?
Get Instant Quote
Unionfab is China's Largest 3D Printing Manufacturing Company for Rapid Prototyping and On-Demand Production Parts.
Copyright Notice 2026 © Unionfab.com All Rights Reserved.
沪ICP备17023219号-3Region: -, Version: 26.09.01
沪ICP备17023219号-3Region: -, Version: 26.09.01
