Most People Misunderstand the Cost of Plastic Manufacturing

The True Cost of Injection Moulding

Injection moulding looks cheap per unit—but only once you’ve already spent a significant amount upfront.

A typical breakdown might look like this:

• Product design: $4,000
• Mould design: $6,000
• Mould manufacture: $25,000
• Factory setup: $100,000
• Staffing, QA, project management (100,000 unit run): $81,000
• Initial production (MOQ): $160,000

Total upfront cost: ~$376,000

Add shipping (~$2,500) and overheads, and your break-even cost lands around $3.80 per unit for the first 100,000 items.

But here’s the key point:

You need ~$380,000 upfront just to get started.

How Costs Decrease Over Time

Once the tooling is paid for, the economics shift:

• Second 100,000 units: ~$160,000
• Tenth 100,000 units: still ~$160,000

Over large volumes, the cost per unit drops significantly—eventually reaching around $1.82 per unit by the millionth item.

This is why manufacturers amortise costs.

Instead of charging the true early cost (e.g. $5/unit), they might charge $2.50/unit, absorbing early losses with the expectation of long-term gains.

That’s how traditional manufacturing works:
high upfront cost, low marginal cost, long-term recovery.

Why 3D Printing Works Differently

3D printing flips this model entirely.

• No moulds
• No factory setup
• Minimal preparation costs

That’s a huge advantage—but it creates a different problem.

Because there’s no large upfront cost, there’s also nothing to amortise over time.

At the same time:

• Material (filament) is ~70% more expensive than pellets
• Per-unit production costs are higher

So unlike injection moulding, costs don’t come down with scale in the same way.

The Hidden Problem: Designers Get Undervalued

This creates a structural issue.

In injection moulding:

• Design costs are spread across thousands (or millions) of units

In 3D printing:

• Designers often get paid once
• With no mechanism to recover value over time

The result?

3D print designers are routinely underpaid—especially for one-off or small-batch work.

Often, customers expect prices comparable to mass production… without understanding the economics behind it.

The Market Behaviour Problem

Most people “support” a service by buying a product—but:

• Few customers generate meaningful follow-on sales
• Exposure rarely converts into revenue
• Designers end up doing work for little or no return

Over time, this creates a market where:

• Low pricing becomes normalised
• Expectations drift away from reality
• Value is consistently eroded

Not out of malice—but because people don’t understand how costs are recovered in manufacturing systems.

Bridging the Gap: A Different Model

This is exactly the gap new manufacturing models are starting to address.

Rather than forcing products into either:

• high-risk, high-volume injection moulding, or
• low-volume, high-cost 3D printing

platforms like ReallyRecycle take a different approach—combining on-demand manufacturing with distributed production and closed-loop materials.

This allows organisations to:

• avoid large upfront tooling costs
• produce only what they need, when they need it
• and recover value from waste materials rather than relying on virgin supply chains

In practice, it means you can stay in the flexible, low-risk phase of production for longer, without the typical cost penalties.

The Real Decision: When to Switch

Ultimately, this comes down to two different economic models:

• Injection moulding: high upfront, low unit cost
• 3D printing: low upfront, higher unit cost

There is a crossover point—a volume at which injection moulding becomes more cost-effective than 3D printing.

That’s when you should switch.

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Example:

ReallyRecycle offers private versus public clusters. Each cluster contains the full cycle in one circular microeconomy. Choosing to host a private versus public cluster is based on the cost per batch in each case. 

The below shows a case-study for a large light-industrial, room-temperature part against injection moulding and blow/vacuum forming production. The cost of the 1,000 units produced is compared against 100,000 units. With injection and blow moulding  

versus

This example demonstrates the "long tail" of 3D printing and vending. Showing that compliant parts can be more cost effective to produce well into the 100,000 range. Offering greater agility and leaner production.   

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Until the cross-over with injection moulding is reached, 3D printing is better and takes over most of:

• Small production runs
• Prototyping
• Testing new ideas
• Rapid innovation
• Functional components 

The Bottom Line

If you don’t understand the cost structure, you can’t price properly.

And if you can’t price properly, you risk:

• undervaluing design
• distorting markets
• or making the wrong manufacturing decision entirely

Understanding this difference isn’t just helpful—it’s essential.