Orion Design
Interactive tool

Manufacturing Payoff Visualiser

Compare total cost curves across common prototyping and production methods. Adjust setup and unit assumptions, then inspect which route wins at your target volume and where crossover points occur.

Inputs

Model assumption: total cost = setup cost + (unit cost × quantity). Use this as an early decision aid, not a final supplier quote.

Results

Quick answer

Injection moulding becomes cheaper when the tooling cost is repaid by the lower unit cost.

Break-even volume = tooling cost ÷ (prototype unit cost − moulded unit cost)

Using the default assumptions against 3D printing: £6,500 ÷ (£18 − £0.70) = roughly 376 units.

Worked example

If a part costs £18 to 3D print and £0.70 to mould, but the tool costs £6,500, the cheapest route depends entirely on realistic demand and how confident you are that the geometry is stable enough to tool.

At 200 units: 3D printing costs £3,600, injection moulding costs £6,640 (tooling makes it more expensive).

At 500 units: 3D printing costs £9,000, injection moulding costs £7,350 (tooling is now justified).

At 1000 units: 3D printing costs £18,000, injection moulding costs £8,200 (tooling saves £9,800).

How this calculator works

The lines show total cost, not unit cost. That matters because early manufacturing decisions are usually distorted by low setup options looking cheaper at the start, while tooled routes only win once volume justifies the upfront commitment.

  • Use low setup routes for learning and early uncertainty: 3D printing and CNC let you iterate without tooling risk.
  • Use bridge routes when demand is growing but tooling still feels risky: Vacuum casting offers lower setup than injection moulding.
  • Use injection moulding when volume and design stability support the investment: Only commit to tooling when the numbers make sense.

Key definitions

Bridge production
An intermediate manufacturing route (vacuum casting, bridge tooling) used to validate design and market fit before committing to full injection moulding tooling.
Breakeven volume
The quantity at which the lower unit cost of tooling offsets the upfront tooling investment.
Setup cost (fixed cost)
The one-time investment in tooling, programming, or mould creation that doesn't change with quantity.
Unit cost (variable cost)
The per-part cost in material and labour that scales linearly with quantity.

FAQ

When should a team tool up for injection moulding?

Only when projected demand, part maturity, and cash-flow tolerance justify the tooling commitment, not just when unit cost looks attractive. Use breakeven analysis to support the decision.

Why compare total cost rather than unit cost?

Total cost reveals when low setup methods stop being the sensible choice and when high-commitment routes finally become economically defensible. Unit cost alone is misleading.

What if my actual costs differ from these defaults?

Update the inputs with your actual supplier quotes. The tool works best when you plug in real numbers from manufacturers who've seen your design.

Should I include labour overhead in unit cost?

Yes, but be consistent. Include the fully-loaded cost of labour (wages plus facilities) in your unit cost estimates.

How this calculator works

Early-stage estimate, not final quotation

This calculator turns the assumptions you enter into an early engineering or commercial estimate. It is most useful for comparing options, surfacing trade-offs, and deciding what needs to be proven before committing to tooling. Use it for scenario planning, not supplier negotiations.

Created by: Andrew Hunter, Orion Design

Source and Attribution

This engineering calculator and supporting analysis were created by Orion Design. Use the result as an early decision aid, then confirm the numbers with suppliers, manufacturing partners, and your own cost accounting. The breakeven logic is based on standard manufacturing economics principles.

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