Why Thermoforming Is a Better Fit Than Injection Molding for Low to Medium-Volume Parts

When teams evaluate manufacturing processes for plastic parts, both injection molding and thermoforming are often considered. But which one is the best choice for low-volume production?

While injection molding is an excellent solution for high-volume production, it is not always the most practical choice for lower-volume or larger parts. For many applications, thermoforming offers lower upfront costs, faster production timelines, and greater flexibility during product development.

If you're producing a low to medium quantity of parts, thermoforming may be the better fit – even if you’ve used injection molding in the past.

Why Is Thermoforming More Cost-Effective for Low-Volume Parts?

1. Lower Tooling Costs

One of the biggest differences between thermoforming and injection molding is tooling cost. Injection molded tooling can be up to 10 times the cost over thermoformed tooling. While that cost can be spread across thousands or even millions of parts, it can be difficult to justify for lower-volume production runs.

Thermoforming uses simpler tooling, which typically costs much less to produce. For companies launching a new product, producing replacement parts, or supporting a niche application, lower tooling costs can significantly reduce overall project expenses.

2. Speed to Market

Thermoforming is often faster than injection molding.

The prototyping and production process for thermoforming is generally simpler than injection molding. Tooling can often be produced more quickly, allowing manufacturers to move from design to production in less time.

3. Better fit for Low Volume, Large Plastic Components

Thermoforming is often a strong choice for larger plastic components. Parts such as vehicle roofs, equipment covers, interior panels, housings, and protective enclosures can become expensive to produce with injection molding due to the size of the required mold.

Thermoforming allows manufacturers to produce large-format parts more efficiently while keeping tooling costs manageable.

4. Easier to Modify Design

Because the upfront costs for tooling is significantly lower for thermoforming, making changes to a design is less complicated. If adjustments are needed after prototyping or during early production runs, manufacturers can often make those changes without the significant expense associated with modifying or replacing an injection mold.

When Is Injection Molding the Better Choice?

Thermoforming is not the right solution for every project. Injection molding remains the preferred option when:

• Production volumes are very high
• Tight tolerances are required
• Complex and highly detailed part geometries are needed

As production volumes increase, the economics often begin to shift. The higher tooling investment required for injection molding can be spread across a larger number of parts, resulting in a lower cost per piece over time. For lower volume runs, injection molding may be a better option for parts that are small and highly complex. A DFM review can help determine the best fabrication method for a specific part.

Thermoforming vs. Injection Molding for Low Volume Parts: A Quick Comparison

While every project has unique requirements, the table below highlights some of the most common differences between thermoforming and injection molding for lower-volume applications.

Related Content: Injection Molding vs. Thermoforming: What’s Better?

Choosing the Right Process for Your Project

The best manufacturing process depends on your production volume, budget, timeline, and part requirements.

For lower-volume projects, thermoforming often provides a more practical balance of cost, speed, and flexibility. For high-volume production, injection molding may deliver better long-term economics.

If you're unsure which process is the better fit, working with an experienced manufacturing partner early in the design phase can help you evaluate costs, materials, and production requirements before making a tooling investment.’

Industrial Custom Products offers DFM services specifically designed to help you evaluate the best production method for your part. Our team can help assess production volume, part design, material requirements, tooling considerations, and long-term manufacturing costs to determine whether thermoforming, injection molding, or another process is the best fit for your application.

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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.