Overmolding & insert molding

Upload your CAD files, receive a quote for overmolding prototyping, and let us help you choose the right material for your application.

Wide range of rigid and flexible materials

Choose Overmolding if you want to cover your prototypes with a soft skin texture or a stiff and durable armor. It’s a great way to make your prototype waterproof, durable, good-looking, and comfortable to the touch.

Choose Insert molding to incorporate shafts, thread inserts, metal fasteners, and more into your part.

Overmolding and Insert molding capabilities:

  • plastic over Plastic Substrate,
  • overmolding Rubber over hard substrate,
  • plastic over metal,
  • multicolor,
  • plastic over custom inserts of any material,
  • plastic over threaded inserts,
  • overmolding mechanical bond,
  • electronic overmolding,
  • wire overmolding.


Overmolding Prototyping technique allows you to combine multiple materials into one part. One material, usually silicone or elastic polyurethane, is molded onto a second material (3D printed or vacuum cast), which is often a rigid plastic.

This is a great way to make plastic parts perform better with improved appearance. It’s the solution for the products that have to withstand tough environmental conditions: water, dust, chemicals, or strong vibrations or to protect your electronics.

The benefits of over-molding include:

  • enhanced grip and ergonomics,
  • abrasion-resistance,
  • electrical insulation,
  • waterproof sealing,
  • better sound absorption and reduced vibration,
  • elimination of parts assembly,
  • manufacture of parts with tight tolerances,
  • variety of texture and design.

Insert molding

Insert molding is a technique in which plastic is injected into a mold with prepared inserts such as shafts, forming inserts, threaded inserts for injection molding, etc. It is used to produce one piece parts in which a plastic encases a prefabricated part (usually a non-plastic part).

This process is executed by placing the inserts into the molds, then the mold is closed, and two polyurethane compounds are poured into it. The liquid resins are injected into the mold and flow around the captured inserts. The resin then solidifies and sticks tightly to the insert. After the mold is opened, the insert is encapsulated in the plastic part to create a common unit.

The advantages of insert molding include:

  • elimination of part assembly,
  • improved part reliability,
  • enhanced part strength,
  • reduced part size and weight.

You do not have to worry about choosing the right material for your prototype. We will do it for you! All you have to do is attach a file with the Technical Data Sheet (TDS) of the material you want your final product to be made of or let us know what environmental conditions it has to withstand. We will select the material that will best reflect the characteristics you want.

If you need design assistance in making your over-molding or insert molding prototype, contact our team. We are always happy to help you with your projects.

Our Overmolding and Insert molding prototyping service

In order to provide Urethane Vacuum Casting Prototyping services, we had built a machine park consisting of 3D printers, low-pressure injection molding machines, and vacuum casting equipment specifically designed to meet our customer’s needs.

You can expect that the prototypes you order will be characterized by high accuracy, repeatability, great surface quality, and isotropy properties.

From a single overmold and insert molding, it is possible to produce even several dozen copies of an element, which additionally allows you to reduce the cost of prototyping, depending on the geometry. Molds can be simple – bipartite – as well as a complex with many dividing lines.

Technical specifications

Maximum build dimensions

  • Dimensions are unlimited as components may be composed of several sub-parts
  • The maximum 3D printed mold size is 300 x 298 x 164 mm

Standard accuracy

  • ±0.2% (with a lower limit of ±0.2 mm)

Mold or 3D printed master pattern layer thickness

  • 25 – 50 μm

Minimum wall thickness

  • 1,5 mm

Surface structure

  • Finished parts typically have smooth and homogeneous surfaces. Depending on the material, polyurethane dyeing is available

Recent projects

We develop products and produce rapid prototypes for customers in various industries: consumer & wearable electronics, food processing, micromobility, automotive, medical devices, hardware startups, and prototyping.

Do you have any questions?

Turn your vision into reality

Contact us and create your unique product. Our team will be happy to help you choose a prototyping technique and implement the entire project.
Contact us