Plastic & Metal 3D Printing

Global delivery 

Plastic & Metal 3D Printing

Global delivery 

Additive Manufacturing 

Plastic & Metal 3D Printing
3D printing

3D printing is a kind of additive manufacturing that produces parts directly from your CAD data, allowing you to create strong, complex geometries, internal lattice structures, conformal cooling channels and other features that can not be made with traditional machining. 

RpProto offers a variety of high-quality 3D printing () services, including SLA, SLS, SLM, DMLS and FDM. This allows for the 3D printing of plastics and metals, and provides options for both prototyping and low volume manufacturing.

3D printing is  used in a wide range of industries, including consumer electronics, aerospace, the medical industry, and automotive.

Types of 3D Printing


SLA 3D printing is an additive manufacturing technology that involves curing liquid resin into hardened plastic with the use of a light source. It can make high-precision, isotropic, and waterproof prototypes and parts with fine details and a smooth surface finish from a variety of materials. 

Of the widely accessible 3D printing processes, SLA has the highest tolerance. SLA 3D printing is used in a variety of industries, from dentistry to manufacturing, to create accurate, precise components.

Because parts may be easily sanded, polished, and painted, this surface quality is ideal for applications that need a perfect finish. It also helps save post-processing time.

In terms of turnaround time, 3D printing has a significant advantage. Parts are built in a short period of time, allowing for faster iteration and a significantly shorter product development cycle, as well as the ability to quickly test mechanisms and assemblies and avoid costly tool changes.

SLA min
SLS parts


Selective laser sintering (SLS) 3D printing uses a high power laser to sinter small particles of polymer powder into a solid structure based on a 3D model.

SLS 3D printed prototypes have better mechanical properties and strength comparable to injection-molded parts, but they have a rough surface and less fine details. The finished prototypes are impact-resistant and can withstand repeated wear and tear.

Selective laser sintering is prefered by manufacturers due to its design flexibility, high productivity and throughput, low cost per part, and proven end-use materials.


Fused deposition modelling is a technique for creating parts by melting and extruding thermoplastic filament. It works with a variety of thermoplastics, including ABS, PLA, and their mixtures.

Compared to SLA or SLS, FDM has the lowest resolution and precision, making it unsuitable for printing complicated designs or parts with intricate features. The process is ideal for quick and low-cost prototyping of simple parts, or concept prototypes.

FDM Parts
dmls part


Direct Metal Laser Sintering is a technique for precisely forming complicated structures. DMLS micro-welds powdered metals and alloys using a precise, high-wattage laser to create fully functional metal components from your CAD model.

DMLS parts commonly are printed with powdered materials including aluminum, stainless steel , titanium, and niche alloys like Nickel Alloy 718. DMLS parts are stronger and denser than investment casted metal parts.


Multi Jet Fusion is one kind of powder bed fusion industrial 3D printing technology. Parts are created by thermally fusing (or sintering) polymer powder particles layer by layer. The materials used are granular thermoplastic polymers (typically Nylon).

MJF can create functional prototyping with high dimensional accuracy, smooth surfaces, and free-form geometry. Changing the type or concentration of the fusing agent can give a part varying material characteristic. The MJF lead time is very short.

MJF Part


PolyJet works by spraying layers of photopolymer resin that are then cured one by one with ultraviolet light. The layers are very thin allowing quality resolution. It has excellent resolution (up to 0.016 mm), smooth surfaces, a wide choice of materials and colours for a relatively low cost and printing time. It can print multi-material and multi-color prototypes.

3D Printing Works

How Does 3D Printing Work?

3D Printing create an object by laying down successive layers of material until the object is created. Each of these layers is a thinly sliced cross-section of the object. When compared to traditional production methods, 3D printing allows you to create complicated shapes with less material.

how does 3D printing work

Advantages of 3D Printing


It is a cost-effective manufacturing process for rapid prototyping, because 3D printing does not require tooling and wastes no material.


Parts can be printed immediately once they have been designed with CAD files, with no need to wait for setup.


Whenever a problem arises during the printing process, it can be corrected without replacing the tooling.


It can make complex geometries and precise internal features that cannot be made with traditional machining.

Application of 3D Printing

3D printing is being used in almost all industries, including:

  •  industrial products (manufacturing tools, prototypes, functional end-use parts)
  • consumer products (eyewear, footwear, design, furniture)
  •  dental products
  • medical
  • architectural scale models & maquettes
  • reconstructing fossils
  • automotive parts
  • replicating ancient artefacts
  • reconstructing evidence in forensic pathology
  • movie props

Common Materials for 3D Printing

There is a wide range of materials used for 3D Printing. The most often used are listed below.

Materials for 3D Printing
  • Nylon
  • ABS
  • Resin
  • PLA (Polylactic Acid)
  • Stainless steel
  • Titanium
  • Ceramics
  • HIPS (High Impact Polystyrene)
  • Gold and silver

Each material has its own unique features, strengths and weaknesses. Moreover, there are important factors such as material type, texture, cost, etc. that must be taken into account in order to avoid mistakes in 3d printing.

Contact us or click here to learn more information to choose the suitable material for your project.

Tolerances for 3D Printing

Standard Precision
± 0.3% (with a minimum of ± 0.3 mm)
Dimension less than 100± 0.3 mm
Dimension bigger than 100± tolerance
tolerance = original dimension x 0.003 mm
Surface Roughness
Standard grey finish: 15μm Ra
Black tinted finish:8μm Ra

Example of application of tolerances:

Example of application of tolerances for 3DPrinting

In circumstances when both 3D printing and traditional machining are feasible solutions, RpProto’s expert engineer team can assist you in comparing the two. You’ll be able to compare not only price differences, but also performance, weight savings, and turnaround times for your projects.

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