Injection Molding

Molded prototypes and low-volume production parts in as fast as 1 day

How Can We Help?
How Can We Help?

Ready for a more cost- and time-efficient way to manufacture parts? Our affordable aluminum molds (starting at $1,500) and quick turnaround times (in as fast as 1 day) help you reduce design risks and limit overall production costs along every step of the product cycle. At Protolabs, our injection molding service is tailored for your manufacturing needs including low-volume production of end-use parts, bridge tooling before high-volume production, mass customization of product lines, and functional prototyping. 


Prototyping or Low-volume Production for Molded Parts?

We provide two injection molding service options—one is best suited for those who need smaller part quantities often associated with prototyping and the other a good fit for those who require larger part quantities common in low-volume production. While the molds themselves are similar, part quantities, lifetime maintenance, quality documentation, and pricing vary depending on which service option is chosen. The right one depends on your project needs.

on demand manufacturing production from protolabs

Which Molding Process Should I Use?

Thermoplastic and Thermoset Materials

injection molding materials

We stock more than 100 different thermoplastic resins and liquid silicone rubber materials that are suitable for various part applications and industries. Customer-supplied materials are also accepted. LEARN MORE >

Color Matching & Finishing Options

Use color matching and a wide selection of finishing options for molding that improve cosmetics, provide customization, and other benefits. LEARN MORE >

Why Injection Molding at Protolabs?


Temper Demand Volatility

React fast to market dynamics and streamline your supply chain with parts on demand.

Offset Line-down Emergencies

Recover quickly with on-demand parts if in-house production or supply chain issues arise.

injection molding mold cavity block illustration

Single Supplier

Maintain consistent quality and guaranteed lead times from a single supplier with in-house tooling and part production.

Eliminate Minimum Order Quantity

Lower inventory costs and warehousing expenses with no MOQ requirements.


Bridge Tooling Before Production

Leverage affordable bridge tooling for design and market validation before capital investment in tools.

Mass Customization of Product Lines

Iterate part designs quickly and accelerate product development to react to market needs.

Inside Rapid Injection Molding

Take a trip through our production floor to see rapid injection molding at work.


Sample Quote for Molding

To get a good idea of how ProtoQuote works, check out a sample quote for molding.

Frequently Asked Injection Molding Questions

What is Injection Molding?

Injection molding is a manufacturing process used to economically mass produce plastic parts, often from thermoplastic and thermosetting polymers. The first step in the process is to machine a mold from a block of metal material—typically steel or aluminum. The mold consists of two sides—an a-side and b-side—which enclose to form a cavity that is filled with plastic resin. After the tooling has been fabricated, it's placed into the injection molding machine, the a-side and b-side of the mold are clamped together, and the mold cavity is filled with a thermoplastic or thermoset resin. Within the mold, the liquid plastic solidifies into the final part. The mold is then opened and ejector pins help to remove the plastic part from the tooling.

What are the Advantages of Injection Molding?

Injection molding's primary advantage is that it can economically manufacture large quantities of plastic parts, so it's commonly used for production runs of plastic parts. It can also be used for functional testing and bridge tooling. Common components manufactured with injection molding include housings and enclosures, snap-fits, optical lenses, connectors, toys, and other mass-produced plastic parts. It's often used in industries such as medical devices, automotive, and consumer electronics.

What Materials are Used in Injection Molding?

There are two main types of materials used for injection molding processes—thermoplastic and thermoset. These are the most common injection molding material families:

  • Acrylonitrile butadiene styrene (ABS)
  • Acrylonitrile butadiene styrene/Polycarbonate (ABS/PC)
  • Polypropylene (PP)
  • Nylon (PA)
  • Polycarbonate (PC)
  • Polypropylene (PP)
  • Thermoplastic polyurethane (TPU)
  • Liquid silicone rubber (LSR)
  • Fluorosilicone
  • Thermoplastic elastomer (TPE)


team of applications engineers

Free moldability analysis within hours