Tooling is a major commitment in a new product development project. So what happens when a supplier builds production tooling before prototype validation?
One customer came to us after exactly this happened. Their supplier had developed the mechanical and electronic parts of a plant-care device, then built the tooling before validating the prototype. When the customer later needed changes, the supplier refused and pushed instead for mass production orders.
The result was a difficult recovery project involving tooling transfer, DFM / DFX review, tooling testing, planned modifications, and further work on the electrical/electronic parts.
What went wrong with this product development project?
The customer had been developing a hardware product for around two years. A supplier was responsible for developing both the mechanical and electronic elements of the product.
However, the supplier built the tooling before the prototype was validated. Later, the customer identified changes that were still needed, but the supplier refused to make them and pushed for mass production orders instead.
This is where the order of the NPI process matters. Prototype validation should help confirm that the design is sufficiently mature before expensive production tooling is treated as fixed.
Why is building tooling before prototype validation a problem?
Tooling converts a product design into something intended for repeatable production. If important product changes are still required after tooling has been made, those changes may no longer involve simply updating a CAD model or modifying a prototype.
The tooling itself may also need to be replaced or reworked, often costing time and money. That is exactly what happened in this case.
What if the supplier wants to move to mass production before the product is ready?
That should be treated as a warning sign.
The original supplier resisted the customer’s requested changes and instead pushed for mass production orders.
But increasing production quantities does not solve unresolved design or engineering problems. It simply creates the risk that those problems will be reproduced across a much larger number of units.
This related Sofeast article, Prototype ≠ Production: The Million-Dollar DFM Mistake, explains why prototype success alone does not prove that a product is ready for repeatable production.
What happened when the customer moved their tooling to us?
The customer eventually transferred the mold tooling to our injection molding facility at Agilian Technology (our contract manufacturing subsidiary). The transfer itself required a considerable amount of communication with the previous supplier.
Once the tooling had moved, the next step was not simply to start production. Tooling DFM analysis and tooling testing were carried out, and tooling modifications were also planned. For the electrical/electronic parts, further DFM / DFX review and improvement work was being considered.
This illustrates an important point: changing manufacturers can solve a supplier-relationship problem, but it does not automatically fix engineering decisions made earlier in development. The product and tooling still needed to be brought to an acceptable level of production readiness, requiring additional engineering work, time, and expense that could have been avoided if the previous supplier had followed a more robust development and validation process.
What should buyers check before committing to production tooling?
Before committing to production tooling, buyers should check whether the product is genuinely ready for that step. Useful questions include:
- Has the prototype been properly validated?
- Are significant mechanical or electronic changes still expected?
- Has a DFM review been completed before tooling?
- Are the tooling risks and manufacturing processes understood?
- What changes might still be needed after the first tooling trials?
- Has mass production readiness actually been demonstrated?
Final thought
Tooling should not be used to force an unfinished product toward mass production.
If a prototype still needs important changes, building production tooling too early can make those changes slower, more expensive, and more difficult.
Validate the product, review it for manufacturability, and understand what still needs to change before committing to production tooling.
P.S. How Sofeast can help if tooling was made too early, such as before prototype validation
If your product is approaching tooling or mass production, Sofeast’s Product Engineering services can support design review, DFM/DFX, tooling risk assessment, validation, and production-readiness work.
For projects that need a structured route from late-stage design through industrialization, New Product Introduction (NPI) support uses defined milestones for prototyping, tooling, validation, pre-production, and the move into mass production.
If the design itself still needs to be proven before tooling, Prototype Development helps test design assumptions and identify issues before the project becomes committed to production tooling.