Additive manufacturing, or AM, solves one of the oldest bottlenecks in production: the tooling wait. Engineers designing complex brackets, channels, or lattice structures no longer have to wait weeks for dies, molds, or fixtures before cutting a single part. It’s no surprise that the process has witnessed such steady market growth over the years.
At Yijin Solution, we combine additive manufacturing capabilities with full CNC finishing and inspection under one roof. If you’re evaluating whether AM fits your next project, this guide covers the process, the technologies, the materials, and the key decision points. Get in touch to request a quote and a free DFM review.
What is Additive Manufacturing?
Additive manufacturing is a process that builds a three-dimensional object by depositing, fusing, or curing material layer by layer from a digital file. It requires no tooling, molds, or subtractive machining. The term “additive manufacturing” is the industrial and standards-aligned designation under ISO/ASTM 52900; “3D printing” is its colloquial equivalent. Both describe the same principle applied at different scales, from desktop prototyping to production-grade metal systems.
How does Additive Manufacturing Work?
While the specifics vary by technology, the overall AM workflow follows a consistent sequence from digital file to finished part. The table below maps each step to the key quality lever that determines whether the output meets specification.
| Étape | Nom | What Happens | Key Quality Lever |
|---|---|---|---|
| 1 | Design & File Prep | Create or import a 3D CAD model. Export as STL, 3MF, or STEP. Repair mesh errors, set wall thickness, and add support geometry in slicing software. | Design-for-AM review |
| 2 | Slicing | Slicing software converts the 3D model into layer-by-layer toolpaths. Set layer height, infill density, support structures, and print orientation. | Layer height & orientation selection |
| 3 | Configuration de la machine | Load material — filament, resin, powder, or wire. Calibrate the build platform, set chamber temperature, and run machine self-checks. | Material quality & bed levelling |
| 4 | Build / Printing | Machine deposits, fuses, or cures material layer by layer according to the sliced toolpath. Build time ranges from minutes to days depending on part size and technology. | Thermal management & atmosphere control |
| 5 | Part Removal | Remove part from the build platform or powder bed. For powder-bed processes, depowder using compressed air or brushing. For resin, drain and collect excess. | Support removal strategy |
| 6 | Post-traitement | Cure, or SLA/DLP; sinter or binder jetting, or heat-treat as required by material and application. | Post-cure / heat treatment parameters |
| 7 | Support Removal & Finishing | Remove support structures by hand, machining, or chemical dissolution. Sand, bead-blast, or polish surfaces to specification. | Surface finish Ra targets |
| 8 | L'inspection | Dimensional check via calipers, CMM, or CT scanning. Visual inspection for delamination, warping, or voids. First Article Inspection against drawing callouts. | FAI / CMM / CT reporting |
| 9 | Secondary Operations | CNC machine tight-tolerance features, apply functional coatings, or integrate hardware such as threaded inserts and press-fit components. | Tolerance stack-up control |
What are the Main Additive Manufacturing Technologies?
Fused Deposition modeling / Fused Filament Fabrication
FDM melts a thermoplastic filament and extrudes it through a heated nozzle, depositing material layer by layer on a build platform. It’s the most accessible and lowest-cost AM technology. FDM suits functional prototypes, jigs, fixtures, and low-stress end-use parts. Common materials include PLA, ABS, PETG, TPU, Nylon, and carbon-fiber-filled composites. Layer lines are visible on final parts, so surface-finish-critical applications need post-processing.
Stereolithography & Digital Light Processing
SLA and DLP cure photopolymer resin using a UV laser or a projected UV light source, building parts layer by layer. These processes produce the highest surface finish and detail resolution of all polymer AM technologies. They suit dental models, jewelry, and high-detail prototypes.
Selective Laser Sintering
SLS uses a laser to sinter nylon or other polymer powder particles together. Because unsintered powder supports the part during the build, SLS requires no support structures. This makes it ideal for complex geometries and low-to-medium volume production of strong, functional polymer parts with good mechanical isotropy. Common materials include PA12, PA11, TPU, and glass-filled nylons.
Direct Metal Laser Sintering / Selective Laser Melting
DMLS and SLM use a high-power laser to fully melt metallic powder layer by layer in an inert atmosphere. The result is a fully dense, production-grade metal part. These processes are specified for aerospace brackets, medical implants, and tooling inserts with conformal cooling channels. They require support structures, stress-relief heat treatment, and typically CNC finishing of critical surfaces.
Binder Jetting
A print head deposits a liquid binding agent onto a powder bed layer by layer. The green part is then sintered in a furnace. Binder jetting offers high throughput and no support structures, making it scalable for larger series than laser powder bed processes. It’s used for metal parts and foundry casting patterns. Dimensional accuracy depends on sintering shrinkage control, typically ±0.3–0.5% linear.
Material Jetting
Droplets of photopolymer or wax are jetted from a print head and cured by UV light — functionally analogous to an inkjet printer operating in three dimensions. Material jetting enables multi-material and full-color parts with excellent surface finish. It suits realistic prototypes, consumer packaging mock-ups, and medical anatomical models. Build materials are generally weaker than engineering-grade thermoplastics, so material jetting is rarely specified for structural end-use parts.
Additive Manufacturing Technology Comparison
Use this table as a starting point for technology selection. Filter first by material family, then by accuracy requirement, then by relative cost.
| Attribute | FDM | SLA/DLP | SLS | DMLS/SLM | Binder Jetting | Material Jetting |
|---|---|---|---|---|---|---|
| Matériaux | Thermoplastics such as PLA, ABS, PETG, Nylon | Photopolymer resins | Nylon, PA12, TPU | Ti, AlSi10Mg, SS, Inconel | Metals, ceramics, sand | Photopolymer, wax |
| Précision | ±0.2–0.5 mm | ±0.05–0.1 mm | ±0,3 mm | ±0.05–0.1 mm | ±0,05 mm | ±0,1 mm |
| Finition de la surface | Moderate with visible layers | Excellent | Modéré | Moderate–Good | Modéré | Excellent |
| Support Structures | Required | Required | Self-supporting | Required | Self-supporting | Required |
| Typical Application | Prototypes, fixtures | Dental, jewelry, detail models | Functional prototypes, low-volume parts | Aerospace, medical implants | Metal tooling, casting patterns | Multi-material, full-color models |
| Coût relatif | Faible | Low–Medium | Moyen | Haut | Haut | Haut |
For polymer prototyping without structural requirements, FDM is the fastest, most cost-effective path. For functional polymer parts with complex geometry, SLS removes the support structure constraint entirely.
Additive Manufacturing vs. Other Manufacturing Processes
Additive Manufacturing vs. CNC Machining
Both AM and Usinage CNC are digital manufacturing processes but their unit economics and geometry capabilities diverge significantly.
| Attribute | Fabrication additive | CNC Machining/Subtractive |
|---|---|---|
| Material Use | Near-zero waste — adds only what’s needed | High waste — chips and swarf removed from billet |
| Geometry Freedom | Excellent — internal channels, lattices, organic shapes | Limited by tool access; undercuts require special setups |
| Tolérances | ±0.05–0.5 mm depending on technology | ±0.005–0.05 mm routinely achievable |
| Tooling Required | None — direct from digital file | Fixtures and sometimes custom tooling required |
| Délai d'exécution | Hours to days | Days to weeks |
| Unit Cost at Low Volume | Low — no tooling amortization | Moderate — setup costs spread over small run |
| Unit Cost at High Volume | High — slow build rates | Low — fast cycle times |
| Meilleur pour | Complex geometry, rapid iteration, low volume | Tight tolerances, high volume, structural metals |
Additive Manufacturing vs. Injection molding
Injection molding carries high tooling costs, with numbers typically reaching $5,000–$100,000 or more. However, it produces very low per-part cost at volumes above 10,000 parts. It’s not viable for prototypes or small batches. AM is the preferred route for design validation, low-volume production, and customized variants before committing to injection mold tooling.
What Materials are Used in Additive Manufacturing?
Material choice determines which AM technology applies and what mechanical properties are achievable. The AM materials library is expanding rapidly, but it remains narrower than the full range of wrought, forged, and cast alloys available to conventional processes.
Thermoplastiques
These are the most common polymer AM materials. PLA suits low-stress prototypes. ABS and ASA handle functional parts requiring UV and heat resistance. PETG offers chemical resistance.
Photopolymères
Photopolymers span a wide property range: standard, tough, flexible, dental, castable, and ceramic-filled resins are available for SLA, DLP, and material jetting. Properties vary significantly by formulation and should be confirmed against the specific application load case.
Metal Powders
These are processed via DMLS, SLM, or binder jetting. Ti-6Al-4V, also known as Titanium Grade 5, is specified for aerospace and medical applications where strength-to-weight ratio is decisive.
Ceramics and Sand
These serve specialist applications: silica sand binder jetting for casting molds and cores; ceramic AM for tooling and high-temperature components.
Tell us your target material and mechanical requirements and we’ll recommend the right AM technology and confirm achievable tolerances.
What Are the Common Applications of Additive Manufacturing?
The following are some of the common applications of additive manufacturing across various industries:
Aerospace & Defense
Lightweight titanium brackets, fuel nozzles, conformal antenna housings, and heat exchangers. Topology optimization and weight saving justify AM’s cost per part when every gram counts.
Medical & Dental
Patient-specific implants like hip cups, cranial plates, surgical guides, orthodontic aligners, and dental crowns. Custom geometry combined with biocompatible Ti-6Al-4V and PEEK makes AM the only viable process for patient-matched devices.
Automotive & Motorsport
Prototype parts, tooling jigs, end-of-line fixtures, lightweight structural brackets, and conformal cooling inserts for injection mold tooling. Short-run spare parts for legacy vehicles are increasingly produced via AM rather than restoring hard tooling.
Key Design Rules for Additive Manufacturing
Additive manufacturing processes follow some stringent design rules for the best operational output.
Minimize support structures
Orient parts so overhangs are self-supported where possible. Supports increase print time, material cost, and surface finish remediation work.
Hollow with infill
Solid fills increase cost and print time with little structural benefit. Use shell-and-infill strategies at 20–40% infill for polymer parts. For metal AM, hollow with drainage holes as standard practice.
Account for anisotropy
FDM and many AM processes are weaker in the Z direction due to inter-layer bond lines. Orient critical load paths in the XY plane.
Flag Critical-to-Function surfaces
Leave stock on tight-tolerance bores, mating faces, and thread features for CNC finishing. Don’t attempt to hold tolerances tighter than ±0.05 mm in the as-built AM condition.
Advantages of Additive Manufacturing
Some notable advantages of additive manufacturing include the following.
No tooling required
Parts go directly from digital file to machine, eliminating the lead time and capital cost of dies, molds, and fixtures.
Unlimited geometric complexity
Internal channels, lattice structures, and topology-optimized shapes are achievable without additional cost or process steps.
Rapid design iteration
Design changes are implemented digitally with no tooling modification, enabling same-day design-to-part cycles in prototyping.
Mass customization
Each part in a build can be a different variant with no changeover cost.
Réduction des déchets de matériaux
Material is added only where needed. Subtractive machining can generate 70–90% waste by billet weight; AM generates near zero.
Supply chain resilience
On-demand, distributed production from digital inventory reduces reliance on physical stock and long-lead-time supply chains.
Disadvantages of Additive Manufacturing
On the flip side, additive manufacturing comes with some notable drawbacks
High per-part cost at volume
AM build rates are slow relative to injection molding or die casting. Unit economics deteriorate rapidly above 1,000–5,000 parts, depending on size and technology.
Post-processing requirements
Most AM parts need support removal, surface finishing, and — in metal AM — stress relief and CNC finishing of critical surfaces. These steps add lead time and cost that must be budgeted upfront.
Anisotropic mechanical properties
Layer-by-layer construction creates directional strength variation. Structural qualification requires orientation-specific test data, not just isotropic material properties from a datasheet.
Limited material range vs. conventional manufacturing
While the AM materials library is growing, it remains narrower than the full range of wrought, forged, and cast alloys available through conventional routes.
Why Partner with Yijin Solution for Additive Manufacturing?
We start every AM project with a Design for Additive Manufacturing Review. Also known as DfAM, the goal is to assess part orientation, support minimization, wall thickness, and tolerance feasibility before any print file is prepared. Problems caught at the DfAM stage cost nothing to fix. Problems caught after a build cost time and material.
From the first article in days to low-volume production bridges while hard tooling is in fabrication, we keep development timelines on track. If you’re ready to evaluate AM for your next project, contact our engineering team for a free DFM review and quote.
Questions fréquemment posées
What is additive manufacturing used for?
Additive manufacturing is used to produce prototypes, tooling, and end-use parts across aerospace, medical, automotive, consumer electronics, and industrial sectors.
What is the difference between additive manufacturing and 3D printing?
The terms are functionally equivalent. “3D printing” is the informal, widely used term; “additive manufacturing” is the preferred technical and standards-aligned designation under ISO/ASTM 52900.
What materials can be used in additive manufacturing?
AM supports a broad and growing material library: thermoplastics like PLA, ABS, Nylon, PEEK, photopolymer resins, metal powders such as titanium, aluminum, stainless steel, Inconel, ceramic powders, and composite materials.
How accurate is additive manufacturing?
Accuracy varies by technology. FDM typically achieves ±0.2–0.5 mm; SLA and metal DMLS achieve ±0.05–0.1 mm. For tighter tolerances on critical features, CNC finishing after the AM build is standard practice. Confirm tolerance capability with your AM supplier based on specific geometry and material before committing to a design.
When should I choose additive manufacturing over CNC machining?
Choose AM when geometry requires internal channels, lattice structures, or organic shapes that CNC tooling can’t access. Choose CNC machining when tolerances tighter than ±0.05 mm are required across the whole part.
What is the lead time for additive manufacturing parts?
Lead times range from same-day for desktop FDM prototypes to 1–2 weeks for production-grade polymer or metal AM parts with post-processing. Unlike die casting or injection molding, there’s no tooling lead time, since the digital file goes directly to the machine. Complex metal AM parts requiring HIP, stress relief, and CNC finishing may require 2–4 weeks total program time.
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