# 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

1. Provides SLM contract‑manufacturing service (not purely equipment sales).
2. Operates official English‑language website with accessible technical documentation.
3. Holds international certifications: ISO 9001 as baseline; ISO 13485/ IATF 16949 for relevant verticals.
4. 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.

Trendy｜SLM & DMLS China Metal 3D Printing Supplier Shortlist

1. 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.

2. 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.

    

3. 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.

4. 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.

5. 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.

6. 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

7. 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.

8. 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.

9. 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.

10. 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

1. Threads: Both internal and external threads are not recommended to be directly printed. Tapping is preferred. Tapping is a value‑added extra‑charge process.
2. Wall thickness: Features thinner than 0.5 mm cannot guarantee successful printing.
3. 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.
4. Precision solution: For local high‑precision mating requirements, secondary finish machining is suggested.
5. 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.
6. 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.
7. Dimensional tolerance: As‑printed tolerance ±0.1‑0.2 mm. Tighter tolerances require secondary machining including turning, milling, pin‑finishing and grinding.
8. 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
9. 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.
10. 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