Comparing Thermoforming Tooling Options for Plastic Parts

When looking at a completed plastic part, it can be hard to see all of the decisions that led to this final form. From design to material selection to the actual manufacturing process - dozens of decisions at each stage culminate in a superior completed project.

One of these vital decisions in the manufacturing process is the type of tooling to use. For thermoformed parts, tooling can literally make or break a part. There isn't a single tooling option that's right for every application. A prototype that only requires a handful of parts has very different needs than a production program expected to run for years.

In this guide, we’ll cover the most common types of thermoforming tooling types and their ideal applications. Understanding the strengths of each tooling type can help you make a more informed decision and set your project up for success.

Production Thermoforming Tooling Types

Production tooling is built to support repeatable manufacturing over larger quantities. ICP commonly works with three production-capable options: water-cooled cast aluminum, billet aluminum, and 3D-printed tooling.

Water-Cooled Cast Aluminum Tooling

Water-cooled cast aluminum tooling begins with molten aluminum poured into a mold to create the desired tool shape. The casting process can reproduce detailed surface features, making it useful for parts with more demanding appearance or geometry requirements.

Cooling channels built into the tool circulate water during production. This helps remove heat from the formed plastic more quickly, reducing cooling time between cycles.

Advantages of Water-Cooled Cast Aluminum Tooling

• Supports detailed tool surfaces
• Provides long tooling life
• Produces consistent parts across production quantities
• Uses active water cooling to shorten cycle times
• Well suited for ongoing production programs

Best for: Production-level quantities where tool longevity, surface detail, part consistency, and faster cycle times are priorities.

Billet Aluminum Tooling

Billet aluminum tooling is machined from a solid section of aluminum rather than created through a casting process. This produces a strong, durable tool that can withstand repeated production use.

Instead of internal water cooling, billet tooling commonly uses a chill plate positioned beneath the tool to help remove heat from the formed part. It may also have a lower tooling cost than a comparable cast aluminum option.

Advantages of Billet Aluminum Tooling

• Machined from solid aluminum
• Stronger than a comparable cast tool
• Provides durable, repeatable production performance
• Uses a chill plate to support part cooling
• May cost less than cast aluminum tooling

Best for: production quantities involving parts with a relatively shallow depth of draw.

3D-Printed Tooling

3D-printed tooling is created through an additive manufacturing process rather than traditional machining or casting. The digital tool design is built layer by layer, which can reduce the time needed to move from a finalized design to a usable thermoforming tool.

Unlike aluminum, 3D-printed tooling is porous and nonconductive. That difference affects how the tool responds to heat and how it is used during production. It can still be a practical choice when speed and tooling cost carry more weight than long-term production capacity.

Advantages of 3D-Printed Tooling

• Can be produced faster than many traditional tooling options
• Reduces upfront investment compared with metal production tooling
• Supports prototypes and lower-volume production
• Allows teams to move quickly from digital design to physical tooling
• Can be useful when project schedules are compressed

Best for: prototypes, lower-volume production runs, and projects where tooling lead time or budget is a major consideration.

Thermoforming Prototype Tooling Types

Prototype tooling allows engineering teams to test a design before committing to full production tooling. These tools are generally faster and less expensive to produce, but they are not designed for the same production life or cycle speeds as aluminum tooling.

Polyurethane Board Tooling

Polyurethane board tooling is machined from dense tooling board material. It can provide a rigid, stable prototype tool without the cost and lead time associated with aluminum.

Polyurethane boards are available in multiple densities. A denser board can be used to create a prototype that more closely represents the shape and rigidity of a future metal tool.

Because polyurethane board tools are not water cooled, they are generally reserved for prototypes and very low-volume runs.

Advantages of Polyurethane Board Tooling

• Shorter lead time than production metal tooling
• Lower upfront tooling cost
• Available in multiple densities
• Can closely represent the form of a future aluminum tool
• Useful for evaluating a part before a larger tooling investment

Best for: prototypes, design validation, and very low-volume runs, particularly when the team expects to transition to a metal production tool later.

Wood Prototype Tooling

Wood tooling is an economical option for creating prototype molds, fixtures, and patterns. It allows teams to produce early physical parts and assess how a design may perform before committing to more expensive tooling.

The primary limitation is material stability. Wood can expand, absorb moisture, or delaminate, which restricts the designs and thermoplastic materials that should be used with it.

Advantages of Wood Prototype Tooling

• Lowest-cost option for many early prototypes
• Faster and simpler to produce than metal tooling
• Can be used for molds, fixtures, and patterns
• Supports proof-of-concept and early design reviews
• Allows teams to identify manufacturability concerns before production

Best for: economical prototypes, basic form evaluation, fixtures, patterns, and early-stage projects where the design is still likely to change.

Thermoforming Tooling Comparison at a Glance

While this table provides a quick overview, the right choice depends on your part design, production goals, budget, and timeline.

Questions to Ask Before Choosing a Tooling Type

The best tooling decision starts with understanding your project's requirements.

Before selecting a tooling option, ask questions such as:

1. How many parts will be produced?

Production volume is often the biggest factor when selecting tooling. Lower volumes may justify lower-cost tooling, while higher production volumes typically benefit from more durable options.

2. Is this a prototype or a production part?

Prototype tooling allows you to validate your design quickly. Production tooling is intended to support consistent manufacturing over much longer production runs.

3. Will the design likely change?

If your design is still evolving, it may make sense to delay investing in premium production tooling until major revisions have been completed.

4. How Detailed Is the Surface?

A project with detailed contours or visible surface requirements may benefit from water-cooled cast aluminum tooling, which can capture a high level of tool detail.

5. What is your production timeline?

Lead times vary between tooling types. If speed is critical, your manufacturing partner can help identify the best balance between turnaround time and long-term production goals.

6. What Will the Tool Cost Over the Full Production Run?

Upfront tooling cost is only one part of the equation. Production teams should also account for expected tool life, cooling time, cycle speed, part consistency, maintenance, and the likelihood of future design changes.

Selecting the right tooling for your application is a vital part of the production process. Industrial Custom Products works with customers to evaluate part geometry, production volume, material requirements, budget, and timing before recommending a tooling approach. By involving an experienced thermoforming partner early, you can select tooling that supports both the immediate project and its longer-term production goals.

Contact ICP to discuss the right thermoforming tooling option for your application.

Industrial Custom Products is a one-stop-shop for custom manufacturing and plastic fabrication, including: prototyping and product development, die cutting and dieless knife cutting, thermoforming and vacuum forming, large part thermoforming, CNC plastic routing, fabrication and assembly and drape forming.