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.
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Certifications ISO 9001:2015 | ISO 13485 | AS9100D | ITAR
Injection molding
4.4 Million
Parts molded each month
50,000+
Product developers served
100+
Plastic and elastomeric materials

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.

Injection molding
Plastic Injection Molding
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Injection molding
Liquid Silicone Rubber Molding
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Injection molding
Insert Molding
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Injection molding
Overmolding
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Additional Capabilities for Injection Molding Orders

Additional Capabilities for Injection Molding Orders

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
Objective

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.

Thermoplastics
ABS LLDPE PETG
Acetal Nylon PMMA (Acrylic, Plexiglas)
Acetal Copolymer PBT Polycarbonate
Acetal Homopolymer/Delrin PC/ABS Polypropylene
ETPU PC/PBT PPA
HDPE PEEK PPE/PS
LCP PEI PS
LDPE PET PSU
    TPU
Thermosets
  • Standard silicone (30, 40, 50, 60, and 70 durometers)
  • Medical-grade silicone
  • Optical-grade silicone
  • Fluorosilicone (fuel and oil resistant)
Injection 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.

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Injection molding
Injection molding

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
Injection molding

Injection Molding FAQs

1How much does injection molding cost?
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.
2Do you do production molding?
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.
3What are your tolerances for molded parts?
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).
4What is the maximum part size for injection molding?
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).

Additional Links and Resources

11 Tips to Reduce Injection Molding Costs

Stretch your budget with these injection molding design recommendations. Quick hint: Simplify!

How to Use Mold Flow Analysis

Flow analysis helps decide gate placement, locate knit lines, and find areas where gas can get trapped.

Glass Transition Temperature of Polymers

Glass transition temperature (Tg) affects moldability, strength, elasticity, transparency, and more.

Beginner’s Guide to Injection Molding

Learn what product designers must consider when designing a part for injection molding, including: warp, surface finish, stress, resin additives, and more.

Get an online quote and injection molding design analysis today.

 

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