blue injection molded part

Injection Molding Services for Custom Parts

Custom injection molding for plastic prototypes and on-demand production parts in as fast as 1 day. Request an injection molding quote today.


ISO 9001: 2015 | ITAR Registered | Critical to Quality Inspection

Plastic and elastomeric materials
Product developers served
4.4 Million
Parts molded each month

Get small, simple molded parts in as fast as 1 day! 

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Injection Molding Processes

Make the move from prototyping to on-demand manufacturing for affordable, high-quality molded parts within days. Better yet, your prototyping tool is free once you shift to an on-demand manufacturing tool. Working with a single supplier that provides free design consultation services also massively speeds up the manufacturing process, allowing for greater supply chain flexibility, more consistent parts, and making qualification a breeze.


Plastic Injection Molding

Black plastic part

Plastic injection molding is a manufacturing process where resin in a barrel is heated to a molten state, then shot into a mold to form a final production-grade thermoplastic part.

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Liquid Silicone Rubber Molding

silicone rubber part

Liquid silicone rubber molding is a thermoset process that mixes a two-component compound together, which is then heat cured in the mold with a platinum catalyst to produce a final part.

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Overmolding & Insert Molding

overmolded plastic part

Overmolding and insert molding are two-part injection molding processes where one material is overlaid onto a second substrate part or metal insert to create a single component.

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Consistency and Quality

We combine scientific (or decoupled) molding techniques, which optimize and lock in processing parameters to ensure part consistency—with extra attention paid to critical-to-quality dimensions using our proprietary automated CMM process. Plus, with every order you'll get:

  • Comprehensive manufacturing analysis
  • Consultative design services
  • Quality reports like FAIs and process capability reports 
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Computer with digital part

Design for Moldability Toolkit

No one ever said that designing and manufacturing molded parts was easy. Our goal is to get you through it quickly and with quality parts. A good starting point is our Design for Moldability Toolkit.

Check Out the Toolkit

Injection Mold Tooling Options and Quality Reporting

We have two unique offers to meet your needs wherever you are in the product lifecycle. Our prototype injection molding process helps you cut product development cycles by weeks—sometimes months—and bridge to production with injection-molded parts within days. Our On-demand Manufacturing process is designed to meet your production needs, and helps you qualify parts quickly to seamlessly transition into production with scientific molding, in-process CMM inspections with GD&T, and a full suite of secondary operations to make sure that your parts show up and perform as expected.

  Prototyping On-Demand Manufacturing

I need to validate my design at Protolabs speeds. I need the flexibility to economically iterate before production.

I have on-demand production needs at Protolabs speeds.

Best When
  • Completing design or material iterations, and assessing cost or manufacturability tradeoffs
  • Key focus is to reduce design risk, increase R&D productivity,  and iterate faster to reduce time to market
  • Typical Quantities <2,000
  • Design is finalized and run-to-run part consistency is critical
  • Key focus is to improve quality, reduce cost, and mitigate supply chain risk
  • Process development, qualification documentation, and mold capability information is required
Mold Cavities Single Single and multi-cavity
Mold Life Limited (guaranteed for at least 2,000 shots) Unlimited
Mold Storage Stored for 18 months of inactivity Stored for 3 years of inactivity
Mold Ownership Upon request Yes
Quality Documentation Quality Inspection Report (QIR) verifies Protolabs' manufacturing process controls
  • Scientific molding process development report
  • In-process CMM inspection of critical dimensions, including 9 GD&T symbols
  • Critical to Quality (CTQ) - identify up to five critical features or dimensions of importance
    • CTQ Partial FAI: 3-part dimensional first article inspection
    • CTQ DIR with Capability Study: 30-part dimensional capability study
Shared Features

Aluminum molds
Standard lead times as fast as 7 days
Tolerances of +/-0.003 in. plus resin tolerance (in./in.)
Set-up fees apply to each run 
Consultative Design Services (CDS)
Finishing Options
No minimum order quantities (MOQ)
Quick-turn shipping in as fast as 1 day


Injection Molding Materials

We have wide selection of more than 100 thermoplastic and thermoset materials. And if you're looking for alternative material options, check out our guide to resin substitutes for ABS, PC, PP, and other commonly molded plastics.




  • Standard silicone (30, 40, 50, 60, and 70 durometers)
  • Medical-grade silicone
  • Optical-grade silicone
  • Fluorosilicone (fuel and oil resistant)


red plastic parts

Definitive Guide to Injection Molding Cover

If you have any issues getting your guide, click here to download.

Definitive Guide to Injection Molding

This complete reference guide walks you through everything from quoting, design analysis, and shipment to best practices that ensure your model is optimized for molding.

Why Choose Us for Custom Injection Molding?

Unmatched Lead Times
Reduce your product development cycle by weeks—sometimes months—and bridge to production with injection-molded parts within days. Some injection molding orders can ship in as fast as 1 day.

Design for Manufacturing Feedback
Every quote includes real-time pricing and design analysis. We evaluate your 3D CAD and help identify any features that may pose challenges during the molding process such as difficult to machine undercuts and insufficient draft.

No Minimum Order Quantities (MOQs)
Procuring parts on demand, without MOQs, helps you manage market or demand volatility and provides a cost-effective source for bridge production, line-down emergencies, end-of-life production, or product customization.

Injection Molding Expertise
We'll work with you throughout the course of your project to help you quickly move from prototyping to production, including finishing options and inspection reporting.

multi cavity tool with blue plastic parts

injection molding press

Advantages of Injection Molding

Injection molding is plastic manufacturing process that can produce high quality parts at scale. It's typically used for low- to high-volume production but our aluminum tooling can also make prototyping runs economical.

  • Low cost at higher volumes
  • Exceptional part cosmetics and surface finish
  • Repeatable
  • Complex parts
  • Low scrap rate
  • Large selection of thermoplastic and thermoset materials

Injection Molding Applications

Injection molding is widely used for plastic part production in medical, consumer, and automotive industries. Typical parts include:

  • Housings
  • Brackets
  • Gears
  • Single-use medical parts
  • Electrical connectors
  • Syringes
  • Containers
white plastic injection molded enclosure


Injection Molding FAQs

How much does injection molding cost?

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Because of the initial capital investment in tooling, injection molding makes sense for higher volumes of parts. Our mold cost starts at $1,495 and will vary depending on part geometry and complexity. Other factors that will impact injection molding cost are lead times and material.

Do you do production molding?

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Yes, we offer a production tooling option called on-demand manufacturing. This tooling option provides several benefits: lower piece part price, multi-cavity capabilities, guaranteed tooling for the life of the project (we will cut a new tool if it wears out), and first article inspections.

What are your tolerances for molded parts?

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In most cases, we can maintain a machining tolerance of +/- 0.003 in. (0.08mm) with an included resin tolerance that can be greater than but no less than +/- 0.002 in./in. (0.002mm/mm).

What is the maximum part size for injection molding?

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The largest size we can support with plastic injection molding is 18.9 in. x 29.6 in. x 8 in. (480mm x 751mm x 203mm).