Plastic Injection Molding

Our plastic injection molding process produces custom prototypes and end-use production parts in 15 days or less. We use aluminum molds that offer cost-efficient tooling and accelerated manufacturing cycles, and stock about 200 different thermoplastic resins.

How Does Plastic Injection Molding Work?

The manufacturing process for molded parts is complex. Before your parts are even molded, we're there to help you with comprehensive manufacturability feedback and consultative design services, so you can avoid mold design pitfalls before the resin hits the mold. From there, our production process is documented and optimized using scientific molding so you get high-quality parts consistently and reliably with every production run. Critical-to-quality (CTQ) dimensions you call out on models let us know what areas are most crucial to the success of your parts. Once the parts start molding, the process and samples are qualified using automated inline CMM technology, generating a detailed FAI and process capability study with no additional lead time.

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  • Shipped within days
  • Molds starting at $1,495
Common Applications
  • low-volume production
  • bridge tooling
  • pilot runs
  • functional prototyping

Our thermoplastic injection molding is a standard process involving an aluminum mold with no heating or cooling lines running through it, which means cycle times are a bit longer. As part of the scientific molding process, our molders independently optimize and monitor fill speed, hold pressure, and hold time, and periodically inspect part quality and cosmetics. During the molding process, we use an automated inline CMM to ensure dimensional accuracy, as well as generate a detailed process capability study and FAI report.

Resin pellets are loaded into a barrel where they will eventually be melted, compressed, and injected into the mold’s runner system. Hot resin is shot into the mold cavity through the gates and the part is molded. Ejector pins facilitate removal of the part from the mold where it falls into a loading bin. When the run is complete, parts (or the initial sample run) are boxed and shipped shortly thereafter.


Watch: Knit Lines in Molded Parts 

See how knit lines in molded parts can impact overall functionality and how to reduce them.

on demand manufacturing injection molded machine

Molding Options: Prototyping or On-demand Manufacturing?

Consider part quantities, lifetime maintenance, level of inspection, and cost when determining which option is right for injection molding.

Design Guidelines

Our basic guidelines for plastic injection molding include important design considerations to help improve part moldability, enhance cosmetic appearance, and reduce overall production time.



Injection Molding Thermoplastics

Choose from production-grade thermoplastic resins ranging from:

A number of colorant options are available and customer-supplied thermoplastics are also accepted.


green plastic part

Finishing and More

Each part has different requirements. That’s why we offer a selection of pre- and post-processing options to suit your unique needs.

Available with every on-demand manufacturing mold:

  • Designing for Manufacturability Feedback (DFM)
  • Scientific Molding Process Development Report
  • First Article Inspection
  • Process Capability Report

Post-processing options:

  • Mold-Tech finish
  • Custom color matching
  • Threaded inserts
  • Pad printing
  • Laser engraving
  • Basic assembly


press operator examines liquid silicone rubber part

Free moldability analysis within hours