# SLM Metal Additive Manufacturing Sourcing Guide: Shortlist of 10 China‑based SLM Service Providers with Cross‑border Delivery Capacity          Trendy Exhibition | Trendy with 3D printing | Aug 08,2026 Selective Laser Melting （SLM / DMLS） is far from an off‑the‑shelf manufacturing capability. Production‑grade SLM hardware costs hundreds of thousands of US dollars, while large‑format machines carry even higher price tags.   This steep capital barrier creates market ambiguity: some factories advertise “metal 3D printing” on their websites yet outsource all production; others only sell SLM equipment and never accept external custom‑part build orders. This curated shortlist draws from years‑long supplier evaluation work for overseas additive‑manufacturing clients. Every company featured below runs in‑house industrial SLM service, maintains English‑language engineering support, holds international‑standard documentation, and supports cross‑border shipment. It targets buyers seeking real‑world metal components, rather than serving as a broad directory of all 3D‑printing vendors.     Why a SLM‑only shortlist, not a general 3D‑printing list? Most mainstream “top‑ranked 3D‑printing service” round‑ups lump DLP resin printing, polymer‑powder SLS and metal SLM/DMLS together. Such mixed rankings deliver limited practical value for engineers sourcing load‑bearing metal parts. SLM metal printing differs fundamentally from polymer‑based additive manufacturing in supplier‑selection logic:     – Higher material risk: Mis‑set parameters for titanium builds waste costly metal powder beds, not low‑cost filament spools.     – Mandatory post‑processing: Nearly all SLM parts require support removal, stress relief, and frequently CNC finish‑machining.   Certification is non‑negotiable: Aerospace and medical buyers cannot qualify vendors without traceable process and material records. Polymer‑oriented service bureaus seldom qualify for fabricating 316L brackets or Ti‑6Al‑4V impellers. This list exclusively covers suppliers operating genuine SLM metal‑printing workshops.     Polymer‑oriented service bureaus seldom qualify for fabricating 316L brackets or Ti‑6Al‑4V impellers. This list exclusively covers suppliers operating genuine SLM metal‑printing workshops.     Four screening criteria for short‑listing 1. Provides SLM contract‑manufacturing service Provides SLM contract‑manufacturing service (not purely equipment sales). Operates official English‑language website with accessible technical documentation. Holds international certifications: ISO 9001 as baseline; ISO 13485/ IATF 16949 for relevant verticals. Proven cross‑border project experience with DHL FedEx‑level international logistics support.   Three categories filtered out from the list • Resin‑only service bureaus without professional SLM metal‑printing capacity. • Factories without English‑language web presence, lacking overseas‑customer‑oriented interfaces and delivery workflows. • Pure‑play equipment vendors declining custom‑print service orders. All ten enterprises below are service‑oriented manufacturers with mature overseas‑order handling workflows.       No. Company Headquarters Best‑fit Scenarios Key SLM Materials 1 BLT (Bright Laser) Xi’an Aerospace & high‑end industrial Ti, Al alloy, steel, Ni superalloy 2 Farsoon Hunan Large‑format parts & global batch orders Steel, Al, Ti, Co‑Cr, high‑temp alloys 3 Eplus3D Hangzhou / Beijing Ultra‑large‑size builds Ti, Al alloy, mold steel, structural steel 4 JS 3D (Jinshi) Shenzhen Cost‑effective custom fabrication 316L, 15‑5PH, Al, Ti, mold steel 5 UnionTech Shanghai End‑use industrial components Steel, Al, Ti, mold steel 6 RapidDirect Shenzhen Overseas prototyping & DFM analysis Steel, Al, Ti, high‑temp alloys, tool steel 7 Unionfab Shanghai Multi‑variant small‑batch production Steel, Al, Ti, precision alloys 8 JLC3DP ‑ High‑volume automated production 316L, Ti TC4, AlSi10Mg 9 Wenext ‑ Multi‑process prototyping Steel, Al, Ti 10 Shenzhen JR Tech Shenzhen Agile rapid prototyping Steel, Al, Ti, high‑temp alloys Trendy｜SLM & DMLS China Metal 3D Printing Supplier Shortlist Subtitle: For Overseas Sourcing｜Cross‑Border Industrial Additive Manufacturing BLT (Bright Laser Technologies) Trendy Comment: A domestic benchmark for aerospace‑grade SLM. Well‑established in high‑end metal additive manufacturing. It delivers remarkable mass‑production performance for hard‑to‑process materials including titanium alloys and nickel‑based superalloys. Equipped with full‑set international certifications, it is well‑suited for high‑reliability aerospace and premium‑grade industrial component projects. Farsoon Trendy Comment: Excels in both large‑format SLM hardware and contract manufacturing. It provides mature multi‑material batch production solutions for global clients. With proven processes for medium‑to‑large‑size parts made of steel, titanium and cobalt‑chromium alloys, it is an ideal option for overseas batch‑volume orders.   Eplus3D Trendy Comment: Specializes in extra‑large‑frame metal printing with outstanding build‑size advantages. It takes great strength in manufacturing large‑scale titanium and mold‑steel components, and is capable of undertaking custom large‑size structural‑part projects from overseas customers. JS 3D (Jinshi) Trendy Comment: A cost‑competitive SLM service provider based in Shenzhen. It covers mainstream materials such as 316L, 15‑5PH, titanium and mold steels, perfectly matching cost‑sensitive custom prototyping and small‑batch‑production demands. UnionTech Trendy Comment: Offers reliable one‑stop delivery for end‑use industrial components with integrated metal‑printing and post‑processing services. Stable manufacturing processes for steel, titanium and mold steel enable it to supply production‑ready metal parts for overseas buyers. Trendy Precision 3D printing      Trendy Comment: An overseas‑customer‑oriented supplier featuring powerful DFM analysis capabilities. It supports automatic drawing evaluation and fast prototyping with a complete material portfolio, helping overseas engineers rapidly validate component designs. Trendy provides large‑scale 3D‑printed sand molds and cores for casting & mold‑making applications.   Trendy｜Large‑Format Sand 3D Printing Solutions Sand Printing Advantages ✅ No traditional mold required, faster casting cycles ✅ Extra‑large sand molds & cores available ✅ Produce highly complex casting geometries ✅ Flexible for prototype to medium‑batch production Trendy Multi‑Disciplinary Edge 🔹 SLM/DMLS Metal 3D Printing 🔹 Foundry‑oriented sand‑printing solutions 🔹 SLS / SLA / DLP polymer additive manufacturing 🔹 Complete in‑house post‑processing 🔹 Global‑ready engineering & cross‑border delivery Unionfab Trendy Comment: Focuses on flexible multi‑variant small‑batch manufacturing. It owns mature processing technologies for titanium, steel and diverse precision alloys, catering to overseas R&D iteration orders with mixed part specifications. JLC3DP  Trendy Comment: Driven by automated production lines for high‑volume standardized metal printing. It ensures high‑efficiency delivery for 316L, Ti‑6Al‑4V and AlSi10Mg parts to satisfy large‑volume requirements for standardized components. Wenext Trendy Comment: A multi‑process service bureau with agile prototyping capability. It achieves fast turnaround for SLM metal samples, supporting quick structural‑prototype verification in R&D phases. Shenzhen JR Tech  Trendy Comment: An agile local SLM prototyping house in Shenzhen. It processes steel, titanium and high‑temperature alloys, and fits fast‑turnaround R&D sampling projects for overseas clients.   📌Trendy with 3D Printing｜Key Design & Delivery Notes for SLM / DMLS Metal Printing Engineers and buyers shall understand process limitations at drawing and order‑placement phase, to avoid part failure, schedule delay and extra cost. Threads: Both internal and external threads are not recommended to be directly printed. Tapping is preferred. Tapping is a value‑added extra‑charge process. Wall thickness: Features thinner than 0.5 mm cannot guarantee successful printing. Assemblies: If pre‑assembly before shipment is required, submit assembly drawings and notify the supplier in advance. Pre‑assembly service is not provided without prior notice. For mating structures, reserve 0.15 mm unilateral gap. Precision solution: For local high‑precision mating requirements, secondary finish machining is suggested. Deformation risk: Thin‑wall, slender and shell‑style parts may deform during high‑temperature sintering. SLM excels at highly complex geometries, yet its as‑printed accuracy and surface finish are inferior to conventional CNC machining. Surface roughness: As‑built surface shows pitting, typical Ra ≈ 7 μm. Secondary post‑processing can achieve Ra 6.3 μm, Ra 3.2 μm or better. Dimensional tolerance: As‑printed tolerance ±0.1‑0.2 mm. Tighter tolerances require secondary machining including turning, milling, pin‑finishing and grinding. Secondary machining capability: SLM metal parts can be processed same as conventional metal blanks: CNC machining (improve critical dimension accuracy) Drilling, tapping, milling, turning Manual grinding Minimum feature size for drawings Aluminium alloys: holes, gaps, raised / engraved fonts ≥ 0.7 mm for stable build. Stainless steel, mold steel, titanium alloy: holes, gaps, fine features ≥ 0.5 mm for stable build. Full post‑processing options for metal 3D printed parts Surface finishing Sandblasting (ceramic bead, glass bead) Polishing: manual, mechanical, chemical, electro‑polishing Vibratory finishing (tumbling) Laser polishing Thermal post‑treatment Annealing (residual stress relief) Solution treatment + aging (Al alloys, stainless steel) HIP‑Hot Isostatic Pressing (stress elimination) Quenching & tempering (for tool steels) Surface strengthening & protection Electroplating: zinc, chrome, nickel plating Passivation (stainless steel) Anodizing (aluminium alloys) Coating: painting, powder coating, PVD / WC / DLC / TiN coating        

 Market Dynamics of Sand Casting Molds With the rapid development of the manufacturing industry, sand casting molds are increasingly used across various sectors. Their excellent performance and cost-effectiveness make them a preferred choice for many enterprises. Advantages 1. High Precision Sand casting molds can accurately manufacture complex-shaped components, ensuring product quality and consistency while meeting industrial standards. 2. Rapid Production The sand casting process allows for the quick production of large quantities of molds, significantly reducing production cycles and enabling enterprises to respond swiftly to market demands. 3. Flexibility Sand casting molds can be customized according to customer requirements, adapting to different production scenarios and product types, which enhances production flexibility.  Materials Sand casting molds typically use the following materials: – Silica Sand: The primary component, known for its good flowability and high-temperature resistance. – Binders: Used to enhance the strength of the molds, commonly including resin and clay. – Additives: Such as moisture-proof agents and hardeners, which can improve mold performance and durability. The choice of these materials directly impacts the performance and lifespan of the molds. Cost Analysis The cost of sand casting molds is primarily comprised of the following factors: 1. Raw Material Costs High-quality sand and binders are fundamental for ensuring mold performance. While premium materials may have higher costs, they effectively extend the lifespan of the molds. 2. Manufacturing Process Although the sand casting process is relatively straightforward, complex mold designs can increase processing time and costs. 3. Post-Processing The cleaning and surface treatment of molds are also part of the costs. Good post-processing can enhance both the performance and appearance of the molds. Overall, sand casting molds offer high cost-performance ratios, enabling enterprises to lower production costs while ensuring quality, thus gaining a competitive edge in the market.

Break the Limits of Manufacturing | 2000mm×3000mm×1200mm Integrated Molding 3D Printing Solution for Ultra-Large Composite Components Trendy  3D printing type Uni-Print 203002 —— Built for Large-Format, High-Efficiency, Low-Cost Manufacturing Our newly launched Uni-Print 203012 large-format 3D printer is engineered to meet the demands of modern industrial manufacturing, delivering breakthrough technology for integrated molding of ultra-large components up to 2000 × 3000 × 1200 mm, eliminating the limitations of traditional assembly processes. • #Material Innovation: Directly utilizes thermoplastic pellets or fiber-reinforced pellets, bypassing cost constraints of traditional filament, perfectly adapting to high-performance composite material requirements, and customizable composite materials are available to meet diverse performance needs. Customzie Compatible with a wide range of materials including ABS, PP, PPS, PC, PMMA, PBT, PETG, PA66+30% GF, POM, PLA, PEEK, TPU, and more. • #Ultra-Large Forming Space: One-stop production of large aerospace/automotive structural parts, composite molds, and other oversized components, significantly enhancing structural strength and production efficiency. • #High-Speed Dynamic Performance: Precision gear rack transmission combined with high-power servo drive achieves printing speeds of up to 200 mm/s, balancing accuracy and productivity. Whether for large sculptures, art installations, architectural prototypes, or industrial tooling jigs, Uni-Print 203012 offers an efficient, low-cost additive manufacturing option to empower high-end manufacturing and innovative design. Key Advantages: ●Surface Treatments: We provide secondary processing such as milling, polishing, and coating to enhance surface quality. ●Cost Efficiency: Compared to SLS/SLA, our DFM (Direct From Manufacturing) approach offers a more economical solution without compromising on quality.

Our Strengths in Die Casting Extra-large size and capacity: Product size 3 meters Consistent Quality: Leveraging the technical team from Hong Kong’s TRENDY MOLD, our outstanding team has successfully produced large-scale die castings. Trendy mould   can support Maintaining uniformity across large production batches. Custom Solutions: Tailored die casting methods to meet specific client needs. Cost-Effective: Offering competitive pricing without compromising on quality. Innovative Techniques: Staying abreast of the latest in die casting technology. As market demands become increasingly diverse, we are proud to announce the launch of our new large-scale die casting mold services! Our die casting technology offers clients high-precision, high-efficiency casting solutions tailored to various industries. Available Surface Finishes for You Choosing In order to make your product stand out on the shelf, we apply integrated creative surface surface treatment to meet your requirements. Our own factories and the establishment of the supply network shorten the process. Use standards for texture to ensure plastic injection or high -quality surface decorative surface of metal parts #Polishing: Achieving a smooth finish. #Plating: Options like chrome, nickel, gold, etc. #Powder Coating: Durable and aesthetic finishes. #Additional Post-Casting Treatments: Detail any other specialized treatments post casting. Trendy Die Advantages: High Precision: tolerance refer 0 .05-0.2MM Efficiency: Optimized production processes for increased manufacturing speed. Reliability: Durable, long-lasting aluminum/steel /Silica sol molds for a variety of industrial needs. Reduce costs : Based on your product, we will design batch mold schemes for you, helping you reduce costs. Quality Assurance Trendy Team With more than 20 years of manufacturing and processing experience, we already have a complete production and processing process and quality control system, and carry out strict inspections on materials, processing, finished products, shipments and other links to ensure product quality and on-time delivery. The company has passed a number of quality management system certifications, and has been committed to providing customers with efficient and high-quality products and services. Why Choose Our Large-Scale Die Casting Molds? Advanced Technology: Utilizing the latest materials and processes to ensure durability and precision Flexible Customization: Offering customizable options to meet specific client needs, whether in size, shape, or functionality. Efficient Production: Enhancing production efficiency and shortening delivery times to get your products to market faster. Professional Team: Our experienced technical team is ready to provide expert advice and support. Join us to explore the limitless possibilities that our large-scale die casting molds can offer! No matter how complex your needs may be, we deliver the perfect solution to help your products stand out in a competitive market.