Design for Manufacture: The Decisions That Cut Unit Cost
The first quote always feels wrong. You had a number in your head, built from research and hope, and the number that comes back is higher. Sometimes much higher.
This is not a sign you have been overcharged. It is usually a sign that the design in front of the factory has not yet been shaped for the factory.
This article explains what actually drives unit cost, and which decisions bring it down without touching the idea itself.
What The Gap Usually Is
When a quote comes back high, founders assume the factory is padding the number. Most of the time, the gap is manufacturability.
A part that looks simple on screen can hide a feature that needs a slower tool, a slower cycle, or a second operation. Every one of those adds seconds to a run. Multiply by ten thousand units and seconds become real money.
The design has not failed. It just has not been translated yet from an idea that works to a part that runs.
Where The Real Cost Lives
Wall thickness is the first lever. A wall that varies by even a millimetre across a part can cause warping, sink marks, or a mould that needs babysitting on the line. Even thickness runs faster and rejects less.
Draft angle is the second. Without it, a part grips the mould on ejection. Grip means longer cycles, more scrap, more hands-on time from an operator who is paid by the hour.
The third is part count. Every extra component is another supplier, another delivery window, another place tolerance can drift. Folding three parts into one, where the physics allows it, often does more for cost than any material substitution.
Why Factory Relationships Matter Here
None of this is guesswork when the person reviewing your design has stood on the factory floor and watched a mould open ten thousand times.
Factory relationships built over more than ten years mean a design gets checked against what the tool will actually do, not what a catalogue says it should do. That is the difference between a quote that surprises you twice and a quote that holds.
It also means changes get explained in plain terms: why a rib moved, why a radius grew, why a wall got thinner. Not a mystery invoice. A design rationale you can follow.
What Continuity Protects
The founders who get hurt are usually the ones who lose the thread between design and production, handing the file to a new team at each stage and hoping nothing gets lost in translation.
Continuity means the person who designed the part for manufacture is still reachable when the first sample comes off the line and something looks slightly off. That single relationship, held from sketch to production, is worth more to your unit cost than any single design tweak.
Pro-Dev designs products to be manufactured from day one, working alongside the same factory relationships across the life of a project. That continuity, from first sketch through to production tooling, is built specifically to close the gap between a workable idea and an affordable one.
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