One supplier for 3D printing, post-processing, inspection, and delivery
3D Printing Post-Processing Services
Improve the appearance, accuracy, surface quality, and functionality of your 3D printed parts with professional post-processing services.
ChanHonTech provides standard and custom post-processing for plastic and metal 3D printed parts, including support removal, sanding, sandblasting, heat treatment, Wire EDM, polishing, painting, dyeing, anodizing, electroplating, CNC machining, threaded inserts, vapor smoothing, assembly, and dimensional inspection.
From rapid prototypes to end-use production parts, we manage 3D printing, finishing, inspection, and delivery through one streamlined manufacturing service.
What Is 3D Printing Post-Processing?
3D printing post-processing refers to the finishing operations performed after a part has been printed. Depending on the printing technology, material, geometry, and end-use requirements, these operations may include support removal, sanding, sandblasting, heat treatment, Wire EDM, polishing, painting, CNC machining, coating, threaded insert installation, assembly, and dimensional inspection.
Post-processing can improve the surface finish, dimensional accuracy, mechanical performance, appearance, and functionality of 3D printed parts. It helps transform a raw printed component into a finished prototype, assembly-ready part, or end-use product.
Why Is Post-Processing Important?
Improve Surface Quality
Reduce visible layer lines, support marks, powder residue, and surface roughness.
Enhance Accuracy and Functionality
Machine critical dimensions, create precise threads, install inserts, and improve part fit.
Achieve the Required Appearance
Add color, gloss, texture, protective coatings, or a more production-ready finish.
Standard Post-Processing
Standard post-processing varies depending on the printing technology, material, part geometry, and application requirements.
Before Support Removal
After Support Removal
Support structures are removed after printing to expose the final part geometry and prepare the surface for further finishing. Depending on the material and printing process, supports may be removed manually, mechanically, by machining, or with specialized cutting tools.
Suitable for: SLA, FDM, DLP, LCD, and metal 3D printing
Main purpose: Remove temporary structures and prepare parts for finishing
Sandblasting removes loose powder, surface residue, oxidation, and minor imperfections from printed parts. It can also create a more uniform matte surface and improve the consistency of the final appearance.
Suitable for: SLS nylon, metal 3D printed parts, and selected resin parts
Main purpose: Clean the surface and create a uniform texture
Heat treatment is used to relieve residual stress, improve material stability, and optimize the mechanical properties of metal 3D printed parts. The exact temperature and treatment cycle depend on the material, printing process, and application requirements.
Suitable for: Stainless steel, aluminum alloys, titanium alloys, nickel alloys, and tool steels
Main purpose: Reduce residual stress and improve dimensional and mechanical stability
Wire EDM is commonly used to separate metal 3D printed parts from the build plate with high precision. It is especially suitable for parts that require a clean cut, controlled separation, or further CNC machining after printing.
Suitable for: SLM and other metal powder bed fusion parts
Main purpose: Separate metal parts from the build plate accurately
Optional Post-Processing
Before Polishing
After Polishing
Polishing for 3D Printed Parts
Polishing is a surface-finishing process used to reduce roughness, remove visible printing marks, and create a smoother, more consistent appearance on 3D printed parts.
It is most commonly applied to metal 3D printed components after support removal, grinding, sandblasting, or CNC machining. Polishing can also be used for FDM and resin printed parts, although plastic parts normally require additional surface preparation, such as filling, sanding, priming, painting, and final buffing.
ChanHonTech selects the polishing method according to the printing technology, material, part geometry, original surface condition, and required final appearance.
Polishing for Metal 3D Printed Parts
Metal powder bed fusion processes such as SLM produce parts with a naturally rough surface caused by partially fused powder particles, layer-by-layer construction, support contact areas, and build orientation.
Before polishing, supports and remaining build plate material are removed. Local support marks, raised areas, and visible surface defects may then be ground or machined before progressively finer abrasives are used to improve the surface.
Depending on the material and surface requirement, the process may include:
- Support and build plate removal
- Grinding of support contact areas
- Sandblasting or bead blasting
- Coarse surface grinding
- Progressive abrasive sanding
- Mechanical buffing and polishing
- Cleaning and final appearance inspection
For dimensionally critical surfaces, CNC machining or precision grinding may be completed before polishing.
Compatible technologies: SLM, DMLS, DMP, and other metal powder bed fusion processes
Before Vapor Smoothing
After Vapor Smoothing
Vapor Smoothing for 3D Printed Parts
Vapor smoothing is a chemical surface-finishing process used to reduce surface roughness, visible layer lines, and the porous texture of compatible thermoplastic 3D printed parts.
During the process, the part is exposed to a material-compatible solvent vapor under controlled conditions. The vapor temporarily softens the outermost surface of the polymer, allowing surface peaks and valleys to level out. The surface then resolidifies, producing a smoother, more uniform finish without adding a separate coating.
Depending on the material and printing technology, ChanHonTech can provide industrial vapor smoothing for SLS and MJF nylon parts, as well as acetone vapor smoothing for compatible FDM ABS parts.
Industrial Vapor Smoothing for SLS and MJF Nylon
SLS and MJF nylon parts normally have a slightly rough, grainy, and porous surface after printing. Industrial vapor smoothing uses a controlled processing chamber and a material-compatible finishing agent to smooth and seal the outer surface.
This process is commonly used for selected PA11 and PA12 parts. It can significantly improve the visual and tactile quality of nylon components while maintaining the advantages of powder-bed 3D printing.
The resulting surface is typically smoother, more uniform, and semi-gloss, with an appearance closer to an injection-molded plastic part.
Compatible technologies: SLS and MJF
Typical materials: PA11, PA12, and selected compatible nylon materials
Typical finish: Smooth, sealed, and semi-gloss
Optional combination: Vapor smoothing can be combined with dyeing for customized colors
Acetone Vapor Smoothing for FDM ABS
FDM ABS parts usually show visible layer lines caused by the layer-by-layer extrusion process. Acetone vapor smoothing can be used to soften and level the outer surface of compatible ABS materials.
The acetone vapor interacts with the outermost ABS surface, reducing layer lines and creating a smoother, glossier appearance. It can be particularly useful for display models, product housings, prototypes, and other parts where appearance is more important than retaining a completely matte printed texture.
Because ABS formulations, additives, pigments, and print settings can vary, a sample test may be required before batch production.
Compatible technology: FDM / FFF
Typical material: ABS and selected ABS-based materials
Typical finish: Smooth and glossy
Important: Acetone vapor smoothing is not suitable for nylon, PLA, PETG, or TPU
Design Considerations
Vapor smoothing temporarily softens the surface of the printed part. As a result, very small features, sharp edges, thin walls, fine text, narrow gaps, and detailed surface textures may become rounded or less defined.
Parts with walls or delicate features close to or below 1 mm should be reviewed before processing. Threads, precision holes, mating surfaces, sealing surfaces, and other dimensionally critical areas should be clearly identified on the technical drawing.
The final appearance may vary depending on:
- Printing technology
- Material grade
- Part geometry
- Original surface roughness
- Required gloss level
- Vapor exposure parameters
Not every nylon or ABS formulation responds in the same way. ChanHonTech will evaluate the material and part geometry before confirming the process.
Painting is one of the most flexible finishing methods for plastic and metal 3D printed parts. It can be used to create customized colors, textures, gloss levels, metallic effects, and production-ready cosmetic surfaces.
For FDM and resin parts, visible layer lines, support marks, gaps, or assembly seams may first be filled and sanded. Primer is then applied to improve surface consistency and paint adhesion. Depending on the appearance requirement, the process may include color paint, texture paint, metallic paint, soft-touch coating, and a protective clear coat.
Metal printed parts may require sandblasting, polishing, cleaning, or primer before painting.
Suitable for: SLA, DLP, LCD, FDM, SLS, MJF, and metal 3D printed parts
Typical applications: Product housings, display models, automotive components, consumer products, robot covers, and presentation samples
Important considerations: Pantone or reference colors should be provided when precise color matching is required. Final color and gloss may vary slightly depending on the substrate and surface preparation.
Electroplating deposits a thin metallic layer onto the surface of a part using an electrochemical process. It can improve visual appearance, corrosion resistance, wear resistance, electrical conductivity, and surface hardness.
Metal printed parts normally require cleaning, polishing, activation, and other pretreatment before plating. Plastic printed parts can also be electroplated, but they first require filling, sanding, sealing, and the application of a conductive surface layer.
Available decorative or functional finishes may include nickel, chrome, copper, zinc, or other compatible plating systems, depending on the base material and application.
Suitable for: Metal printed parts and specially prepared resin or plastic parts
Typical applications: Decorative components, electronic housings, automotive parts, functional metal surfaces, and premium appearance models
Important considerations: Plating adds measurable coating thickness. Threads, fitting surfaces, holes, and critical dimensions should be clearly identified and masked or compensated where necessary.
Anodizing is an electrochemical surface treatment mainly used for aluminum parts. It creates a controlled oxide layer on the surface rather than applying a separate coating.
The anodized layer can improve corrosion resistance, wear resistance, surface hardness, and appearance. Different colors and anodizing specifications may be available depending on the aluminum alloy and intended application.
Before anodizing, metal printed parts may require support removal, heat treatment, CNC machining, polishing, or sandblasting. The original surface condition has a significant effect on the final anodized appearance. Printed surfaces that are not machined or polished may retain visible texture after anodizing.
Suitable for: Aluminum and selected aluminum alloys
Typical applications: Automotive parts, electronic enclosures, robot components, fixtures, brackets, and end-use aluminum components
Important considerations: Different aluminum alloys may produce different shades even under the same anodizing process. Critical dimensions must account for the anodized layer thickness.
Powder coating applies a dry powder to a conductive metal surface using electrostatic attraction. The coated part is then heated so that the powder melts, flows, and cures into a continuous protective layer.
It provides a durable, consistent finish with good resistance to wear, impact, moisture, and corrosion. A wide range of colors, gloss levels, and textures can be produced, including matte, semi-gloss, glossy, and textured finishes.
Metal printed parts usually require cleaning, sandblasting, grinding, or surface leveling before coating. Surface defects and rough printing texture may remain visible if the part is not properly prepared.
Suitable for: Steel, stainless steel, aluminum, and other compatible conductive metals
Typical applications: Equipment components, housings, brackets, industrial parts, automotive parts, and outdoor components
Important considerations: Powder coating is thicker than anodizing and some liquid coatings. Threads, precision holes, mating surfaces, and grounding areas may require masking.
Electrophoretic coating, also known as E-coating or electrophoresis coating, uses electrical current to deposit a uniform paint layer onto a conductive metal part submerged in a coating bath.
Because the coating is deposited electrically, it can reach complex geometries, corners, recessed areas, and partially enclosed surfaces more evenly than many conventional spraying methods. It is commonly selected when corrosion protection and consistent coverage are important.
The part normally undergoes cleaning and surface pretreatment before coating, followed by rinsing and thermal curing.
Suitable for: Steel, aluminum, and other conductive metal parts
Typical applications: Automotive components, brackets, structural parts, equipment components, and corrosion-resistant assemblies
Important considerations: E-coating usually provides a relatively thin and uniform layer. Critical surfaces, threads, electrical contact areas, and assembly interfaces may require masking.
CNC machining is used to finish critical features after 3D printing. Typical operations include milling flat surfaces, machining holes, finishing sealing surfaces, correcting mating interfaces, improving concentricity, and achieving tighter dimensional tolerances.
For metal printed parts, machining is often completed after heat treatment and build plate removal. Additional material must be reserved in the design for surfaces that will be machined. This machining allowance gives the cutting tool enough material to create an accurate final surface.
CNC machining can also be applied to selected rigid plastic printed parts, although the clamping method and cutting parameters must be carefully controlled to avoid deformation or cracking.
Suitable for: Metal printed parts and machinable rigid plastic parts
Typical applications: Precision holes, bearing seats, sealing surfaces, threaded features, assembly interfaces, and flat reference surfaces
Important considerations: Machining allowances, datum locations, critical dimensions, and required tolerances should be clearly marked on the drawing.
Tapping creates internal threads in prepared holes after printing or CNC machining. It is commonly used when a part must connect directly to screws, bolts, fittings, or other mechanical components.
For metal parts, the printed pilot hole may be machined or drilled to the correct diameter before tapping. For rigid plastic parts, thread performance depends on the material, wall thickness, thread size, and expected assembly frequency.
Directly tapped plastic threads are generally more suitable for light loads or limited assembly cycles. When frequent disassembly or higher strength is required, brass threaded inserts or other metal inserts are usually recommended.
Suitable for: Metal parts and selected rigid engineering plastic parts
Typical applications: Housings, brackets, fixtures, manifolds, tooling, and mechanical assemblies
Important considerations: The required thread specification, pitch, depth, tolerance, and blind-hole clearance must be defined on the drawing.
Brass threaded inserts create strong and reusable metal threads inside plastic 3D printed parts. They are commonly used when plastic components must be assembled and disassembled multiple times without damaging the thread.
Depending on the material and insert design, the insert may be installed by heat, ultrasonic equipment, press fitting, or adhesive bonding. Heat-set installation is particularly common for thermoplastic FDM parts, while other methods may be used for SLS nylon or resin components.
The surrounding wall thickness and insert hole geometry must provide enough material to resist cracking, pullout, and rotation.
Suitable for: FDM, SLS, MJF, SLA, DLP, LCD, and selected plastic printed parts
Typical applications: Electronic housings, robot components, covers, fixtures, prototypes, and low-volume production parts
Important considerations: Insert type, thread size, installation method, hole diameter, installation depth, and minimum wall thickness should be confirmed before printing.
Helicoil inserts are coiled stainless-steel thread inserts installed into specially prepared threaded holes. They create strong and wear-resistant internal threads, especially in aluminum and other relatively soft metal materials.
The process normally includes drilling or machining the hole, tapping it with the required insert thread, installing the Helicoil, and removing the installation tang when required.
Helicoil inserts are often selected for components that require repeated fastening, higher thread strength, repairable threads, or improved resistance to wear and stripping.
Suitable for: Aluminum, stainless steel, titanium, tool steel, and selected rigid plastic parts
Typical applications: Automotive components, robot parts, aerospace components, fixtures, tooling, and structural assemblies
Important considerations: The insert specification, thread length, installation depth, required quantity, and installation standard should be clearly defined.
Assembly services combine printed parts with other printed components, machined parts, fasteners, bearings, bushings, inserts, magnets, seals, electronic components, or standard hardware.
Depending on the design, components may be joined through screws, snap fits, adhesive bonding, press fitting, welding, or mechanical fastening. For large FDM or resin parts, separate printed sections may also be bonded, filled, sanded, and painted to create a complete appearance model.
Trial assembly can help identify interference, dimensional mismatch, insufficient clearance, or incorrect fastening before final delivery.
Suitable for: Plastic, metal, and hybrid assemblies
Typical applications: Product prototypes, equipment components, robot assemblies, automotive parts, housings, fixtures, and functional demonstration models
Important considerations: Assembly drawings, BOM information, fastening requirements, adhesive specifications, and acceptance criteria should be provided where available.
How to Select the Right Post-Processing Method
The right post-processing method depends on how the part will be used, which surfaces are important, and what final result must be achieved. A cosmetic prototype, precision metal component, nylon end-use part, and assembled product may require very different finishing processes.
Before selecting a finish, consider the required appearance, dimensional tolerance, mechanical performance, material, operating environment, quantity, and budget.
Quick Selection Guide
| Your Requirement | Recommended Post-Processing Options |
| Smooth painted prototype | Filling, sanding, primer, painting and polishing |
| Smoother nylon surface | Sandblasting and vapor smoothing |
| Colored nylon parts | Dyeing, optionally combined with vapor smoothing |
| Precision metal features | Heat treatment, Wire EDM and CNC machining |
| Strong reusable plastic threads | Brass threaded inserts |
| Strong reusable metal threads | Tapping or Helicoil inserts |
| Corrosion-resistant aluminum finish | Anodizing |
| Durable colored metal surface | Powder coating or E-coating |
| Metallic decorative appearance | Polishing or electroplating |
| Final assembled product | Inserts, fastening, bonding, inspection and assembly |
What Information Should You Provide?
To recommend the correct post-processing method, please provide:
- 3D files
- 2D drawings for critical dimensions
- Printing material or material requirements
- Quantity
- Intended application
- Required color and gloss level
- Reference photos or finish samples
- Critical cosmetic surfaces
- Tolerance requirements
- Thread and insert specifications
- Required inspection items
- Assembly requirements
Our engineers will review the complete requirement and recommend a suitable combination of printing, finishing, machining, inspection, and assembly processes.
Our 3D Printing Post-Processing Workflow
A successful post-processing project begins before the part is printed. Material selection, print orientation, support design, machining allowance, cosmetic surfaces, coating thickness, and assembly requirements can all affect the final result.
ChanHonTech reviews the complete manufacturing process before production and coordinates 3D printing, finishing, machining, inspection, and assembly through one workflow.
FAQs
Is 3D printing with post-processing more expensive than traditional manufacturing?
Not necessarily. The total cost depends on part geometry, material, quantity, tooling requirements, surface finish, and lead time.
For complex parts and suitable production volumes, combining 3D printing with post-processing can be more cost-effective than conventional manufacturing because it may reduce tooling investment, simplify complex manufacturing steps, and shorten the overall production cycle.
This approach is already used in industries such as footwear molds, consumer electronics, automotive manufacturing, tooling, and mold production. However, for simple geometries and very large quantities, traditional manufacturing may still offer a lower unit cost.
ChanHonTech evaluates the complete process—including printing, finishing, machining, inspection, and assembly—to determine the most suitable manufacturing route.
Is post-processing suitable only for prototypes, or can it also be used for mass production?
Post-processing is suitable for both prototypes and mass production.
For high-quality prototypes, additional processes such as filling, sanding, polishing, painting, CNC machining, coating, or assembly can improve appearance, dimensional accuracy, and functional performance.
For mass production, post-processing can be integrated into a standardized and repeatable manufacturing workflow. Mature applications already use 3D printing together with heat treatment, machining, dyeing, vapor smoothing, coating, inspection, and assembly to deliver production parts in batches.
The correct process depends on the material, quantity, quality requirements, consistency standards, and final application.
Can 3D printing post-processing support repeatable mass production across different industries?
Yes. Successful 3D printing mass production requires more than simply printing the part. It also requires a stable combination of material selection, printing parameters, support strategy, post-processing, machining, inspection, and quality control.
ChanHonTech has supported end users in China, Vietnam, and Indonesia across industries including footwear molds, tooling and molds, cultural and creative products, automotive manufacturing, consumer electronics, and golf products.
These projects have helped customers apply 3D printing not only to improve prototype quality, but also to establish repeatable production workflows for commercial batch manufacturing.
Based on the application, we can help plan the complete route from printing and standard post-processing to surface finishing, CNC machining, inspection, assembly, and final delivery.
Will post-processing affect the dimensions or tolerances of my parts?
Yes. Many post-processing operations either remove material or add a surface layer.
Sanding, polishing, grinding, and CNC machining remove material, while painting, electroplating, anodizing, powder coating, and E-coating add thickness. Vapor smoothing may also slightly soften sharp edges or fine surface details.
Critical dimensions, threads, holes, mating surfaces, sealing areas, and protected surfaces should therefore be identified on a 2D drawing. For precision parts, machining allowances and coating thickness should be considered before printing.
Need Professional 3D Printing Services?
Send us your 3D files, drawings, material, quantity, and finishing requirements. Our engineers will recommend the right combination of printing, surface finishing, machining, inspection, and assembly for your project.
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