CNC Machining & Injection Molding — DFM/Moldflow Support, CMM Inspection, Prototype to Production Solutions.
On-demand 3D printing services in China
Turn your CAD into real parts without fighting unclear quotes or unpredictable quality. SPI’s 3D printing team in China helps you move from concept to testable parts with engineering support and stable lead times.
3D printing, also called additive manufacturing, is a process that creates parts layer by layer from a digital 3D model. Material is selectively deposited or cured until the full geometry is built. This method is fast, cost-effective and ideal for producing complex, customized parts on demand.
Unlike subtractive methods such as CNC machining, 3D printing only adds material where it is needed. This reduces waste and makes it possible to produce shapes that are difficult or impossible to machine, such as internal channels, lattice structures or organic forms.
Today, engineers rely on 3D printing for rapid prototyping, functional testing, jigs and fixtures, and even end-use parts in demanding industries like automotive, medical and electronics.
If you want deeper material selection details, see our 3D Printing Materials Guide .
The key benefits of working with SPI for 3D printing are speed, design freedom and engineering support. We help you move from CAD to physical parts in days, with materials and tolerances matched to real-world requirements.
Resin 3D printing delivers high detail and smooth surfaces, making it ideal for prototypes, appearance models and parts that must match complex industrial design.
Metal 3D printing produces fully dense metal components without tooling. It is suited for demanding applications where strength, temperature resistance or weight reduction matter.
Large-format polymer 3D printing is the workhorse for bigger parts, fixtures and jigs. It uses engineering plastics to deliver robust parts at a reasonable cost.
We offer a curated set of 3D printing materials selected for engineering performance and repeatability.
Typical applications include functional prototypes, small-batch production parts, assembly and fit-check models, test rigs, heat-resistant components, tooling jigs, and replacement spares where lead time is critical.
SPI is an engineering-led manufacturing partner in China with years of experience delivering complex machined and molded parts. Our 3D printing services are built on the same quality systems and shop-floor know-how.
Every project includes a free DFM review and a clear, predictable timeline. Here is exactly what happens after you send us your CAD files.
Send us your STEP, IGES or STL files along with basic requirements such as material, quantity and any critical tolerances.
Our engineers review wall thickness, overhangs, supports, tolerances and material selection, then send back a quote and clear recommendations within 24 hours.
Once you approve, we schedule the build. Standard resin and small metal parts typically ship within 3 days; larger or more complex parts ship in 5–7 days.
Parts are inspected according to your drawing or our standard control plan. You receive photos, key dimensions and optional CMM data, plus tracked shipping.
Here are a few examples of how engineers use our 3D printing services to solve real manufacturing and validation challenges.
A semiconductor customer needed a complex brass fixture with tight flatness and minimal warpage. Using metal 3D printing, we produced the part in three days and machined critical faces to ±0.02 mm. This allowed their team to validate the assembly one week earlier than planned.
An automotive startup required a series of resin housings to test a new sensor package. We proposed a tough, high-temperature resin and adjusted wall thickness to reduce print risk. The first build passed fit and thermal testing, saving an additional prototype cycle.
For an injection molding customer, we produced a metal 3D printed insert with conformal cooling channels. Combined with our CNC finishing, the insert reduced cycle time by around 15% compared with a conventionally machined tool.
We support engineers across multiple industries who need rapid prototypes and low-volume production parts.
FDM 3D printing is best for functional prototypes and jigs using common thermoplastics such as ABS or PLA. SLA offers the highest detail and smoothest surfaces with photopolymer resins, ideal for visual models. SLS uses nylon powder to produce strong, durable parts with no support structures, suited for demanding end-use components.
| Technique | Best For | Typical Materials | Accuracy | Surface Finish |
|---|---|---|---|---|
| FDM | Functional prototypes, jigs, fixtures | ABS, PLA, PETG, nylon | Moderate | Basic |
| SLA | High-detail visual models, small functional parts | Photopolymer resins | High (±0.05 mm) | Very smooth |
| SLS | Durable end-use parts, complex geometries | Nylon (PA12, PA11) | High | Moderate |
Engineers often hesitate to outsource 3D printing because of variable lead times, unclear material performance and unpredictable print quality. These are the issues we design our workflow to solve.
| Pain Point | Your Concern | SPI™ Solution |
|---|---|---|
| Lead Time Variability | “It can take 1–2 weeks before I see a usable part.” | We offer T1 parts in as fast as 3 days for standard geometries. Same-day DFM and clear scheduling mean you know exactly when parts will arrive. |
| Material Uncertainty | “Will the resin or polymer survive my test conditions?” | We match your application to proven resins, polymers and metals, and can validate material performance against your spec during the free DFM review. |
| High Cost per Piece | “Prototypes cost almost as much as production parts.” | Selective printing, smart orientation and material choice help optimize build time and support usage. We suggest wall thickness and infill strategies that reduce total cost without sacrificing performance. |
| Surface & Fit Issues | “Printed parts arrive warped or don’t fit my assembly.” | We control print parameters, post-print cleaning and curing, and use chamber-controlled environments where required. Critical faces can be CNC-machined and key dimensions inspected before shipping. |
| Design Iteration Delays | “Each design loop slows the whole project down.” | Instant quote plus DFM feedback lets you iterate overnight, not over days. Our engineers highlight risky features early so your next revision is more likely to print right the first time. |
Below are examples of 3D printed parts we have produced for customers across automotive, medical, electronics and robotics industries. Each part demonstrates different materials, build sizes and surface finishes.
Our 3D printing workflow is designed to deliver parts that not only look right but also fit and function correctly in your assemblies.
QA checks typically include visual inspection, key dimensions and fit checks against your drawings or CAD. For critical projects, we can provide CMM reports, material certificates and full traceability by lot number.
Pricing depends on material, build size, complexity and finishing requirements. We aim to give transparent estimates up front and help you optimize designs for cost.
Here are answers to common questions engineers ask about our 3D printing services. If you don’t see your question here, you can always contact our team directly.
If you want to dive deeper into formal definitions and standards for additive manufacturing, the following resources are a good starting point.
“ASTM F2792 – Standard Terminology for Additive Manufacturing Technologies” – ASTM.org
📎 https://www.astm.org/f2792-12a.html
“ISO/ASTM 52900 – Additive Manufacturing — General Principles and Terminology” – ISO.org
📎https://www.iso.org/standard/74563.html
“Understanding Tolerances in Additive Manufacturing” – NIST.gov (U.S. National Institute of Standards and Technology)
📎https://nvlpubs.nist.gov/nistpubs/ir/2019/NIST.IR.8263.pdf
Upload your CAD files, material preferences, and quantities, and our team will come back with a clear 3D printing quote, lead time, and process recommendations for your parts.
