Cost, Quality, and Predictability
Design for Manufacturing is often discussed as a downstream optimization activity that is addressed after the design is complete and the focus shifts to scale-up and production. In medical device development, that framing is misleading.
In practice, many of the most consequential manufacturing decisions are made during design, often without clear intent and without being explicitly recognized as manufacturing decisions. Architecture, materials, tolerances, and assembly concepts all shape manufacturing outcomes long before production begins.
Design for Manufacturing focuses on building process capability and predictability, with cost reduction emerging as a consequence of improved quality and reduced variability.
Why Design for Manufacturing Belongs in Development
During development, change is relatively inexpensive. Design choices can be explored, challenged, and refined with limited downstream consequence. After design transfer, even small changes trigger validation effort, documentation updates, tooling updates, supplier coordination, and regulatory review.
This asymmetry is critical. Teams that defer Design for Manufacturing considerations until later phases often discover that their options are constrained not by manufacturing capability, but by decisions that were already embedded in the design.
Effective Design for Manufacturing recognizes that manufacturing feasibility is not separate from design quality. It is one of its primary determinants.
Cost Is Locked in Early, Whether Acknowledged or Not
A significant portion of product cost is determined long before production begins. Decisions that shape cost include system architecture, part count, material selection, process assumptions, assembly sequence, tolerance strategy, and implicit expectations about automation.
Teams that plan to optimize cost later often find that the design itself resists improvement. Tooling may not support volume, assembly may require skilled labor, and processes may be difficult to control or validate consistently.
At that stage, incremental changes have limited impact on cost, and the design effectively establishes a long-term cost structure that must be managed over the life of the product.
Design for Manufacturing and Quality Are Tightly Coupled
Quality issues are frequently attributed to execution failures such as operator error, supplier variability, or process drift. While these factors matter, many quality problems originate earlier in the design process.
Design decisions that push process capability to its limits create fragile systems. Tight tolerances without functional justification, manual steps that rely on judgment rather than control, and assemblies that require adjustment all increase the likelihood of defects.
These choices elevate the risk of nonconformances, CAPAs, audit findings, and post-market corrections. Strong Design for Manufacturing reduces quality risk by designing robustness into both the product and the process.
In regulated environments, robustness functions as a core risk management strategy and directly influences compliance, validation effort, and long-term product performance.
Designing for Scale During Development
Prototypes are built to support learning, while production systems are designed for repeatability and consistency. Confusing these objectives leads to predictable failure modes.
A common pattern is for prototype processes to evolve into production processes by default. Manual steps are tolerated with the assumption that automation will be added later, suppliers are selected for speed rather than capability, and process assumptions remain implicit rather than explicit.
Designing for scale requires credible process intent during development, even when full production tooling has not yet been implemented. Teams must understand how the product will ultimately be built and validated, even if early builds rely on temporary methods.
This also requires involving key suppliers early, particularly when the manufacturing process extends upstream into their facilities or when their process knowledge could materially improve downstream manufacturing outcomes.
Scale should be incorporated as a core design constraint from the earliest stages of development.
The Cost of Change Across the Lifecycle
The impact of early Design for Manufacturing decisions becomes clearer when viewed across the product development lifecycle.
The cost of change impact is well understood. Changes that are trivial during concept become expensive during verification and disruptive after transfer. Early Design for Manufacturing shifts effort earlier, when flexibility is high and consequences are limited.
Design for Manufacturing as a Design Responsibility
Effective Design for Manufacturing is not owned by manufacturing alone. It is a shared responsibility that belongs in design reviews, risk assessments, and architectural decision-making.
This does not require organizations to reorganize or add permanent headcount. What it does require is the application of manufacturing judgment at the moments when it matters. During development, those moments occur frequently and under time pressure.
When manufacturing expertise is absent from design discussions, teams often compensate later through additional validation effort, increased quality controls, and operational workarounds. These measures address symptoms rather than underlying causes.
Summary
In medical device development, Design for Manufacturing is most effective when applied early in the design process. During development, teams have the flexibility to shape outcomes rather than react to them.
Strong Design for Manufacturing enables predictable cost, reliable quality, and confident scale-up. It reduces late-stage surprises and shifts effort toward informed decisions rather than corrective rework.
The foundation for manufacturing predictability is laid in the design phase, long before the first unit ever reaches the factory floor.
Free Design for Manufacturing Review
If you have an active or upcoming medical device development program, we offer a free 30-minute Design for Manufacturing review.
This peer-level discussion focuses on:
- Reviewing your current design and development plan through a manufacturing lens
- Identifying where early DfM decisions could reduce variability, quality risk, or cost later
- Highlighting design assumptions that may limit scalability or complicate validation
- Suggesting targeted adjustments while change is still inexpensive and flexible
Email: sdonnigan@a65consulting.com
Or schedule your design for manufacturing review online
References
- U.S. Food and Drug Administration (FDA).
Design Transfer (21 CFR 820.30(h)).
https://www.ecfr.gov/current/title-21/chapter-I/subchapter-H/part-820#p-820.30(h) - Boothroyd, G., Dewhurst, P., & Knight, W. A.
Product Design for Manufacture and Assembly (3rd ed.). CRC Press, 2010.
https://www.routledge.com/Product-Design-for-Manufacture-and-Assembly/Boothroyd-Dewhurst-Knight/p/book/9781420089279 - Ulrich, K. T., & Eppinger, S. D.
Product Design and Development (6th ed.). McGraw-Hill Education, 2015.
ISBN: 978-0078029066
Cooper, R. G.
Winning at New Products: Creating Value Through Innovation (4th ed.). Basic Books, 2019.
ISBN: 978-1541617804