Injection Molding


A faster, easier way to order high-quality injection molded parts that accelerates iteration, testing, and scaled production. Upload your designs for DFM feedback and pricing in 1 business day.

Services

Injection Molding Processes

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OEM Plastic Injection Molding

Steel tooling, rapid lead times, and no minimums — ideal for prototyping, design validation, and bridge production.

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Overmolding

Whether for buttons, grips, or seals, mold rubber or silicone over an existing plastic part.

Construction loose dowels isolated on white background

Insert Molding

Mold plastic around a preformed — often metal-threaded — insert.

What Is Injection Molding?

Injection molding is the most cost-effective way to make a plastic part at scale. The injection molding process involves injecting molten plastic into a mold tool, then ejecting the solidified part. This process quickly repeats hundreds or thousands of times, amortizing the cost of the mold tool and driving down the cost of each unit to a few dollars or less. Since the injection molding process uses the same mold tool for each part, it offers consistent quality across every part. Injection molding also has the highest variety of materials, colors, cosmetics, polishes, and surface textures when compared to CNC machining or even 3D printing.

BoYi’s custom plastic mold service is a service providing on-demand prototype and production molding. We take a customer-first approach which means we find the right injection molding supplier within our manufacturing supplier network to mold the parts the way you need them—without design compromises—at the right price point. We offer expert consultation on each injection mold quote and project managers on every order to move your parts from design to production. Our team has experience in every industry, especially medical injection molding and liquid silicone rubber molding. First-time buyers receive $500 off their first mold with Xometry. We offer both domestic and China injection molding options, as well as ITAR injection molding.

Injection Molding Capabilities

ServiceDetails

Lead Time

Starts at 5 business days, including fast quote responses with design-for-manufacturing (DFM) feedback

Production Options

Domestic and international

Materials

Most plastics, including custom sourcing and matching; see materials list below

Machines Available

Single, multi-cavity, and family molds; 50 to 1,100+ press tonnage; side actions including hand-loaded cores.

Inspection and Certification Options

Includes FAI and PPAP. ISO 9001, AS9100, ISO 13485, UL, ITAR, and ISO 7 and 8 Medical Clean Room molding.

Tool Ownership

Customer-owned with mold maintenance

Mold Cavity Tolerances

+/- 0.005″ when machining the mold and an additional +/- 0.002″ per inch when calculating for shrink rate

Part to Part Repeatability

+/- 0.004″ or less

Critical Feature Tolerances

Tighter tolerances can be requested and may increase the cost of tooling because of additional sampling and grooming. Xometry will mill to a steel-safe condition on critical features.

Available Mold Types

Steel and aluminum; Production grades range from Class 105, a prototype mold, to Class 101, an extremely high production mold. Xometry typically produces Class 104, 103, and 102 tools.

How to work with us

1.Sending CAD Files To Email or LinkedIn

First, you can send CAD files and detailed information (material, quan-tity, tolerance, etc.) to us  Email or Linkedin .

2.Manufacturability Analysisand Offering Quotation

Secondly, we will analyze manufactur-ability based on drawings of productsand give you a favorable quotation.

3.Start manufacturing!

Thirdly, we will start manufacturing process once all relevant deatials are fully confirmed.

4.Parts are Completedand Shipped

Finally, we will carefully pack and shipthe goods when the products are completed.

LET’S DO IT!

We Are Here For You

Ready to Get a Injection Molding Quote? Free shipping available for domestic Injection Molding orders ; learn more!

Get Your Instant Quote Now
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Quick Turn Molding Services Criteria Table

GuidanceQuick Turn Molding

Tooling

Prototype grade aluminum molds

Mold Shot Life

Up to 2,500 shots

Size Limitations

Max XYZ of 10″x12″x3.9″

Mold Finishes

6 Standard finishes (SPI-A2, A3, B2, B3, light or heavy textured)

Material Selection

Limited to 25 families of materials, or customer supplied

Inspection Options

Standard XYZ Dimension Report

Typical Quote Response Time *

Same day, in as little as 2 hours

Part Lead Times

Fast as 5 business days

Country of Origin

Domestic only (made in USA)

* Quoting response times reflect requests received during business hours, requests received outside business hours will be addressed the following business day.

Quick Turn Molding Materials

Material Families Available

ABS | Acrylonitrile Butadiene Styrene

PC-ABS | Polycarbonate-Acrylonitrile Butadiene Styrene

ASA | Acrylonitrile Styrene Acrylate

HDPE | High-Density Polyethylene

HIPS | High-Impact Polystyrene

LCP | Liquid Crystal Polymer

LDPE | Low-Density Polyethylene

PA 6/6 | Polyamide 6/6, Nylon 6/6

PBT | Polybutylene Terephthalate, Valox

PBT-PET | Polybutylene Terephthalate-Polyethylene Terephthalate

PC | Polycarbonate

PC-PBT | Polycarbonate-Polybutylene Terephthalate, Xenoy

PEBA | Polyether Block Amide

PET | Polyethylene Terephthalate, Rynite

PETG | Polyethylene Terephthalate Glycol, Eastar

PMMA | Polymethyl Methacrylate, Acrylic

POM | Acetal Polyoxymethylene, Delrin

PP | Polypropylene

PPA | Polyphthalamide , Zytel HTN

PS-PPE | Polystyrene-Polyphenyl Ethers, Noryl

PS | Polystyrene

Soft PVC | Polyvinyl Chloride, Geon HC

TPE | Thermoplastic Elastomer, Santoprene

TPU | Thermoplastic Polyurethane (Shore A)

TPV | Thermoplastics Elastomer, Vulcanized Rubber

For more information on these materials, see our materials page. Customers may also supply their own materials upon request.

A Quick Guide To Designing Injection Molding Parts

 
This Tips sums up the best practices for designing injection moulding to help you get quality polymer parts at a reasonable cost.

 1. Strategic Material Selection for Optimal Performance

Choose materials based on the design requirements, considering properties like dimensional stability, impact resistance, and chemical resistance. Semi-crystalline materials, such as polyethylene and polypropylene, are preferred for bearing and wear applications due to their excellent durability and low friction characteristics. On the other hand, amorphous materials, like polycarbonate and ABS, offer superior dimensional stability, making them ideal for parts that require tight tolerances and high precision.

2. Precision in Part Tolerance for Enhanced Functionality

Understand the tolerances required for your part, as they are influenced by material shrinkage during cooling. Tighter tolerances may be necessary for assembly and functionality, ensuring proper fit and performance of the final product. However, achieving these tolerances increases production costs due to more stringent manufacturing controls and potential for higher reject rates. Balancing the need for precision with cost considerations is crucial in the design process.

3. Maintaining Consistent Wall Thickness to Prevent Defects

Maintain consistent wall thickness to avoid defects such as sink marks, warping, and differential cooling rates. Varying wall thickness can lead to internal stresses and deformation. Refer to recommended thickness ranges for different materials to optimize part quality and reduce cycle time. For instance, thinner walls may reduce material usage and cooling time, but they must still meet structural requirements.

4. Incorporating Draft Angles for Smooth Ejection

Incorporate draft angles to facilitate the ejection of the part from the mold. Draft angles prevent the part from sticking to the mold, reducing wear on the mold and ensuring smoother production. Different surfaces require different draft angles, with textured surfaces needing the most draft to avoid drag marks. Typically, a draft angle of 1-2 degrees is sufficient for smooth surfaces, while textured surfaces may require 3-5 degrees.

5. Strengthening Parts with Ribs and Gussets

Add ribs and gussets to enhance part strength and reduce cosmetic defects such as sink marks. Ribs provide additional support without significantly increasing material usage. Ensure rib thickness is 50-60% of the wall thickness to prevent warping and shrinkage. Properly designed ribs can also help in maintaining dimensional stability and reducing the weight of the part.

6. Improving Material Flow with Radii and Fillets

Use radii and fillets to eliminate sharp corners, which can create stress concentrations and impede material flow during molding. Rounded corners improve material flow, enhance structural integrity, and reduce the likelihood of cracks or fractures. Incorporating radii and fillets not only improves the aesthetics of the part but also enhances its durability and performance.

7. Avoiding Undercuts to Simplify Molding

Design parts to avoid undercuts, which complicate the molding process and increase tooling costs. Undercuts require additional mold actions or complex tooling solutions, leading to higher production costs and longer cycle times. Use alternatives like slots, adjusted parting lines, or bump-offs to achieve the desired design features without the complications of undercuts.

8. Designing Bosses for Support and Aesthetic Quality

Attach bosses to side walls or ribs to provide support and minimize visible sink marks. Bosses are typically used for fastening or assembly purposes. Ensure the boss thickness is no more than 60% of the part thickness to prevent sink marks and maintain structural integrity. Proper boss design includes fillets at the base to reduce stress concentrations and improve material flow.

9. Optimizing Gate Locations for Superior Quality

Communicate with your supplier about aesthetic and functional requirements to determine optimal gate locations and types. The placement and type of gate can significantly impact the appearance and quality of the final part. Proper gating minimizes visual marks on important surfaces and ensures even material distribution, reducing the risk of defects like voids or weld lines.

10. Early Supplier Collaboration for Design Excellence

Engage with your supplier early in the design process to discuss material selection, tolerances, and other design considerations. Early collaboration ensures the final part meets all specifications and quality standards. Your supplier can provide valuable insights into manufacturability, potential cost-saving opportunities, and best practices for achieving high-quality parts. This partnership helps in identifying potential issues early and streamlining the production process.

Need Help?

FAQs

Injection molding could absolutely be used for prototyping, but it depends on the project requirements. Typically, for projects that require less than 10 prototypes, injection molding may not be the most cost-effective option. We are happy to meet with you to discuss your needs and help determine if injection molding is the correct process for you.

BOYI is happy to offer you injection molding services with NO minimum order quantity.

Absolutely. As long as you are able to supply project requirements and part specifications, Fictiv is happy to provide a no-obligation quotation.

Of course! BOYI will maintain your mold for 2 years after your most recent order and allow you to re-order parts for the duration of the mold life.

BOYI’s quick turn molding process involves using a proprietary insert and base system to produce molded parts rapidly. Depending on your project’s requirements and complexity, parts can be delivered as quickly as 5 business days!

Yes! As part of Xometry’s service, we offer DFM feedback on all projects both pre-sale as well as during final tool kickoff to ensure the project is a success.

After receiving the order, one of our manufacturing engineers reviews the statement of work. A case manager is assigned, and an appropriate manufacturing supplier is identified. A comprehensive DFM/PEG report is created and provided for approval. Upon approval, tooling and mold production is commenced. T1 samples are produced and shipped for approval. Upon approval, the remaining parts are made.

Injection molding is used across various industries, including aerospace, medical devices, consumer goods, energy, electronics, automotive, robotics, toys, and more.

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