Prototyping Service

What We Do

Visualization model of a car engine
Visualization model of a car engine

INAC US, Inc.provides prototypes mainly to designers and engineers engaged in product development.

Our clients are able to deliver high-quality products to the market by being able to confirm the shape, color, and assembly of their products before mass production.

Our company is also consulted in a variety of cases, such as for presentations to customers, exhibitions, and for samples to provide to mass producers.

We employ cutting processing, 3D printing, vacuum casting, and other methods to provide the optimum prototypes that meet the applications and needs of each customer.

Why Choose Us

High Quality

We deliver outstanding high quality products by using ultra-precision 5-axis machining centers, combined with our experience in devising the optimal setup and processing conditions.

Additionally, we use high-precision 3D measuring machines to conduct in-depth inspections of each and every prototype to ensure that we always deliver them with high-quality.

5-axis Machining Center
5-axis Machining Center
Consultation with customers
Consultation with customers

Solution Capability

We work with customers to deeply understand their wishes so as to propose the most appropriate materials and methods of construction to meet their requirements in application, quality, cost, and delivery time.

Transparent Prototyping

We are a leading company in transparent resin processing.

As a manufacturer specializing in development prototypes, we have accumulated a great deal of experience in this field.

We have the ability to do everything from cutting and transparent 3D printing to vacuum casting in-house. Our products can be used for a multitude of applications including internal visualization experiments, educational models, and exhibition mocks.

Transparent model (Cable Carrier)
Transparent model (Cable Carrier)

Industries We Serve


Linear Cover
Linear Cover


Robot Arm
Robot Arm


Car Engine
Car Engine


Acrylic Lens
Acrylic Lens


Robotic Arm
Linear Cover

Interior Design

acrylic aquarium
Acrylic Aquarium


Cosmetic Container
Cosmetic Container

Materials We Handle


  • Polycarbonate
  • ABS
  • Acrylic
  • POM
  • PC/ABS
  • PP
  • PE
  • HDPE
  • PPS
  • PBT
  • 6N
  • 66N
  • MC Nylon
  • PET
  • PVC
  • PEEK
  • CFRTP, etc.

Also, GF grade, CF grade, conductive grade, etc. for each material.

Ferrous Metal

  • SS40
  • S45C
  • S50C

Non-Ferrous Metal

  • A1000 series
  • A2000 series
  • A5000 series
  • A6000 series
  • A7000 series
  • SUS303
  • SUS304
  • ADC12
  • Brass
  • Oxygen-free copper, etc.

Prototyping Methods

CNC Machining

Resin / metal machining​ : improve a cutting process for a wide variety of materials

A type of processing method that uses 3- and 5-axes processing machines to remove unnecessary parts of a material to create the desired shape. Blocks of resin are machined and processed this way.

Lathe Processing

lathe processing

A processing method in which a workpiece is rotated and a fixed cutting tool is applied to it to cut it. This method is suitable mainly for machining cylindrical parts. With combination lathe-mills that combine lathing and milling, complex shapes can be created using a single machine.

3D Printing

3d printing

This is a process in which a UV laser irradiates UV curable resin, resulting in a model that is created one layer at a time. Compared to FDM, SLA type is suitable for manufacturing complex, high-quality parts. Our company uses materials that boast the industry’s highest level of high transparency and moisture resistance.

We can manufacture parts with bottle and undercut shapes. We leverage our expeience and know-how to achieve a high transparency finish, which is useful for design parts.

We can handle everything from super-fine shapes such as brushes with a diameter of approximately φ0.24 mm to parts as large as automobile front grilles.

Vacuum Casting

vacuum casting

This is a method in which a material such as silicon rubber used as a mold for production, instead of a metal die. The resin is poured into the mold under vacuum conditions to solidify, and then the mold is removed, leaving only the product.

This usually has a cost advantage over cutting and modeling in the 10 to 20 piece production range. We can handle the notoriously difficult coloring of lame, barre, and luminescent paints, as well as multicolor simultaneous casting.

Simplified Molding

simplified molding

Simplified molding is a type of injection molding. Injection molding is a process in which heated, molten material is injected into a mold and allowed to cool and solidify.

Simple aluminum molding is a less expensive production process and take less time to complete when compared to using conventional steel molds.

Prototyping Applications

Internal Visualization

Transparent manufactured products can be used for visualization experiments. In addition to observing the internal operation of structural components, it is also useful for analysis of internal fluid dynamics, being able to pour in and observe actual oil or gas flow.

Mockup for Exhibition

We produce explanatory display samples of various products such as automobiles, medical products, and toys.

By making the cover transparent, the internal structure can be effectively exhibited.

When combined with decorative (coating) technology, it is possible to produce even better-looking mock-ups.

Light weight Sample

A significant reduction in weight can be achieved by manufacturing “cut models” through resin processing and decorative treatments instead of conventional ferrous and nonferrous metals. The reduction in weight lowers transportation costs and reduces risks in handling. 

Past Works

Engine Visualization

An Internal visualization model of engines and transmissions used in automobiles/industrial machinery.

The model can be used for observing oil poured inside the transmission. Using simulations, we can perform analysis that is normally difficult such as dropping in oil under its own weight and observing the generation of bubbles.

We also design electrical equipment in-house that can do things such as making a light shine when turning the engine handle, or connecting to speakers to play audio.

Internal Visualization

Leave it to us to make your high-transparency optical models. Our company uses materials that boast the industry’s highest level of high transparency and moisture resistance.

With our finishing techniques cultivated through our wealth of past experience, your drawings that would be too complex to create by cutting such as the medical samples, automobiles, amusement equipment, interior designs can be taken and brought into 3 dimensions!

Robotic Arms

A part of a robot arm that was installed in a factory line is visualized here.

The transparency of the exterior makes it simple to check the condition of the internal mechanisms, resulting in improved maintainability and reduced inspection time.

If an actual product is available for reference, it can be duplicated with a silicon mold so production can begin without drawings or 3D data.

Get In Touch!

If you have something you want to make, please contact us. Even a rough idea is OK.

We will give shape to your idea and deliver it to you. Please feel free to contact us.


No problem! We can create products even from hand-drawn sketches.

Yes, we can handle production of single units.

It usually takes about 2 weeks, but it varies depending on the size, quantity, shape, etc.

We are experts in transparent resin processing, having thoroughly mastered our proprietary transparency method. Leave it to us for processing with high transparency, high quality, and quick delivery.

Yes, we will propose the most appropriate materials and construction methods for the intended use, operating environment, and required quality.

STEP1: Reception of drawings or data, and meeting on applications and use cases

We will hold a meeting with you to discuss the details. For example, if the purpose of the prototype is to observe the inside of the equipment, we’ll need to gather enough detail to determine things like if any liquids will pass through, what temperatures can be expected, whether there should be any leaks, etc. We consider this meeting to be very important for the process because determining the optimal production method will depend greatly on the intended application among other factors.

STEP2: Proposal for the method of production based on the meeting

In addition to the intended application and operating environment, the delivery time, quality requirements, and target cost are also taken into account when considering production methods. Our sales staff, who are well versed in prototyping with knowledge on which materials and what processing methods to use, will propose the most appropriate manufacturing method.

STEP3: Creation

We create things using a variety of manufacturing methods, including cutting, 3D printers, casting, aluminum molds, and lathing. Sometimes, additional work is performed at a machining center to improve the precision of the 3D printed products. Manufacturing possibilities are expanded by making full use of each machine through this process. Or we can meet customer needs by makinng full use of each machine through this process.

STEP4: Decorating, plating, printing

Paint and plating treatments can be added to processed products. Few companies are able to handle the entire process up to and including decoration. The ability to deliver everything in a short period of time speeds up product development. Colors can even be reproduced exactly as desired, as in-house color mixing is can be done.

STEP5: Verification

We have an assortment of manual and CNC coordinate measuring machines, roughness measuring machines, and various other measuring instruments. We are committed to quality, and there’s no better proof of that than the fact that when many of our customers buy INAC’s services and experience the quality, they come back again to place repeat orders.

STEP 3: Rendering and Scene Integration

We can also handle exterior modeling and interior structure design based on illustrations. After creating the 3D models, we can create a rendering to fit a scene. We can deliver images even if we do not proceed with production.

STEP 2: Detailed Design and 3D Modeling

Once the design is determined, drawings and 3D models will be created. The structure will be examined, taking into consideration not only the external design but also functionalities such as mating and sliding.

STEP 1: Initial Design Consultation

The first step is a meeting to discuss the project. Drawings are not required for this meeting. We will create a design from a sketch based on the overall image and concept that you have in mind.