Custom Plastic Manufacturing and Custom Plastic Parts

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Low-Cost Injection Molding Leader
By Jeremy Losek, May 19th, 2022

A Proven Custom Plastic Parts Manufacturer 

Custom plastic injection molding is a versatile manufacturing process used across a wide variety of industries including automotive, healthcare, packaging, toys, and consumer products. If the product or parts of the product are made of plastic, chances are they were made with plastic injection molding .

ICOMold’s international team of custom plastic molding experts has decades of combined experience in designing, building, and prototyping plastic parts. This experience can help customers take any project from design to production and make the process of custom plastic injection molding smooth and easy.  

What Is Custom Plastic Molding? 

Custom plastic molding is the process of making plastic parts with an injection-molding machine. Injection molding is an economical and efficient manufacturing process that can be used to make large quantities of the same or similar parts. The process starts by making a metal mold of the part. A mold consists of two blocks of metal, typically steel or aluminum, that are machined to create a cavity on each side. The two sides of the mold are then brought together in the injection-molding machine. The machine shoots molten thermoplastic into the mold to fill the cavity. After the part has cooled, the mold is opened, the part is ejected, and the process starts over.  

Custom Plastic Manufacturing Capabilities 

ICOMold prides itself on decades of combined experience as a leader in the industry of custom plastic molding. Whether the project requires hundreds, thousands, or hundreds of thousands of custom plastic parts manufactured, ICOMold can design and build the most cost-effective custom plastic molds using the most advanced technologies and methods.  

Custom Plastic Molding – The Complex Made Simple 

The process of taking a part from concept to final product can be complex. The information available on the internet about custom plastic molding can be dry, long, or overly technical. And not without good reason, there is a lot that goes into injection molding. Designing a mold for a custom plastic part requires knowledge, experience, and a very precise kind of expertise. The potential problems can include failed parts, quality and safety issues, and cost overrun in both mold making and part production.  

ICOMold by Fathom will guide you through every step of the custom plastic molding process. Decades of experience and expertise makes ICOMold the easy choice. ICOMold can produce extended parts runs on high-speed machines that will output quality, custom plastic products. 

Plastic material selection is a crucial decision in the customer plastic molding process. The experts at ICOMold have years of experience to help you choose the right material for the project. Material choice will not only affect the performance of the final product but the price as well. Custom plastic manufacturing materials look and behave differently under differing circumstances. The experts at ICOMold are happy to help with these types of decisions, whether it’s the best material for the job or if a different material can be substituted to reduce project costs. 

Check out the Plastic Material List with a searchable table to determine what material is best for your project. Or reach out to the experts at ICOMold for their professional recommendation.  

Unique Shapes and New Part Designs? No Problem. 

ICOMold is up to the challenge. We have helped some of our customers with projects no other custom plastics manufacturer would touch. No job is too complicated or difficult. And that is the point. Sometimes the design needs to be unique and unusual to rise above the competition. If you can dream it, ICOMold will make it reality.  

ICOMold’s creative mold designers will work with you to help design the solution that surpass all expectations without exceeding the budget and timeline.  

ICOMold’s state-of-the-art machinery can produce intricate, highly detailed parts – up to 48 inches long – with an almost-limitless number of slides and inserts. ICOMold has developed Plastic Injection Molding Design Guidelines to make it easy to see if your custom plastic can be injection molded. 

Custom Plastic Molds 

We use the best material available because the final part quality depends on the precision of the custom plastic mold. This is especially true for custom plastic parts that are part of an assembly and must fit together precisely to make a complete product. In these cases, it is vital that each plastic part is molded from precision tools that are made to the exact custom specifications and run on the appropriate plastic injection molding machines. ICOMold is able to approach these complex projects with confidence because of our long and successful track record.  

Flexibility. Teamwork. Resourcefulness. 

A custom plastic manufacturer should be viewed not only as an expert resource but also as an additional member of your team. ICOMold’s goal is to bring your product to life.  

The custom plastic parts manufacturer you choose will become a vital part of your product manufacturing process. Components produced by your chosen manufacturing partner will play a major role in enhancing your company’s product and sales. The choice of a custom plastic manufacturing company will be a key factor in your success, whether you’re sourcing plastics for containers, toys, medical devices, electronics, automotive, or aerospace. Most custom plastic manufacturing products can be made in multiple ways. The ICOMold team of experts will help you decide the best and most economical way to go. 

Uniquely Qualified To Make Custom Plastic Parts 

ICOMold are experts and passionate about finding the best custom plastic manufacturing method for each client, product, budget, and timeline. Our team thrives on challenge and excels in unusually difficult projects.  

  • Our People – ICOMold’s team of engineers, custom plastic manufacturing professionals, and support staff have been working together a long time. They are experienced professionals who understand the importance of digging deep for answers, better methods, and more advanced ways to produce excellence at affordable prices when manufacturing custom plastic parts. 
  • Our Methods – ICOMold is committed to looking out for our customers’ current needs and future requirements. We utilize a variety of plastic injection molding methods to maximize quality and profitability. ICOMold is open-minded and optimistic when it comes to exploring options to fit our customers’ needs. 
  • Our Customer Service – ICOMold will do everything possible to make it easy for our customers to compare different product materials, quantities, and configurations. ICOMold offers a 30-second online quote calculator, detailed DMF reports and customer-acclaimed communication. 
  • Our Capabilities – ICOMold is a U.S.-based company with low-cost manufacturing facilities stateside and in China. As part of the Fathom manufacturing network, ICOMold is able to offer customers as extended array of manufacturing services to meet any project budget and timeline.  

See the detailed capabilities page for specifics on Molding Capabilities.ICOMold’s capabilities include custom plastic mold tooling, production, overmolding, insert molding, ultrasonic welding, pad printing, silk screening, and functional testing by customer specification.  

Injection Molding Production Highlights

>  Instant mold and part quote
>  Low cost, quick build and quality production
>  Online project management
>  Trouble-free part modifications

>  No size limitations
>  Any commercially available material and surface finish


What is the process for injection molding production?

ICOMold’s instant online plastic injection molding quote and mold frame sharing technology enables us to simplify and shorten both the quoting and tooling manufacturing process for custom plastic injection molding.

  1. Load your 3D CAD file to get an instant mold and part quote
  2. Upon order confirmation, ICOMold starts the mold and part order process
  3. Tooling design review by ICOMold engineers
  4. Upon design approval, ICOMold begins building your injection mold
  5. Customer examines samples for approval
  6. Part production begins

Go to our plastic injection molding and CNC machining case studies page to see how we helped customers on their projects.

ICOMold is a Leader in Plastic
Injection Molding for US Companies

Manufacturing Locations Across National Time Zones
The Fathom Advanced Manufacturing Platform

1050 Walnut Ridge Drive
Hartland, WI 53029
ISO 9001:2015


444 W. 21st St. Ste. 101
Tempe, AZ 85282
ISO 9001:2015
NIST800-171 Compliant


7770 Washington St.
Denver, CO 80229
ISO 9001:2015


13758 Johnson Street NE
Ham Lake, MN 55304


1801 Rowe Lane
Pflugerville, TX 78660
ISO 9001:2015

1513 Sam Bass Rd
Round Rock, TX 78681
ISO 9001:2015
ISO 13485:2016


620 3rd Street
Oakland, CA 94607
ISO 9001:2015 Design Certified
NIST 800-171 Compliant


14000 N.W. 58th Court
Miami Lakes, FL 33014
ISO 9001:2015 Design Certified
ISO 13485:2016



1920 Slaterville Rd
Ithaca, NY 14850

401 W. Shore Blvd.
Newark, NY 14513
ISO 9001:2015


1207 Adams Drive
McHenry, IL 60051
ISO 9001:2015

1401 Brummel Ave
Elk Grove, IL 60007
ISO 9001:2015 Design Certified