“How much will a prototype cost?” is one of those questions with an answer that frustrates whoever is asking it: it depends, and not vaguely, but on several specific variables that change the number by an order of magnitude. A single plastic part can cost fifty dollars or five thousand, depending almost entirely on the method chosen and the quantity needed, not on the complexity of the design itself.
Rapid prototyping costs break down into three components that apply regardless of method: machine or tooling time, material, and setup or labor. What shifts dramatically between methods is how those three costs are weighted, which is why comparing “3D printing” to “CNC machining” as if they were priced on the same scale misleads more than it clarifies.
3D printing: low setup cost, no volume discount
FDM and SLA 3D printing for a single functional part typically runs in the range of fifty to three hundred dollars, largely driven by material and machine time rather than any setup fee, since there is essentially no tooling to prepare. The catch is that this cost barely improves with quantity. Printing ten identical parts costs close to ten times what printing one costs, because each part still consumes its own material and machine time from scratch. For a single prototype or a handful of variants, that is a non-issue. Past roughly ten to twenty units, it stops being the cheapest option.
CNC machining: higher setup, better per-unit economics at small volumes
CNC machining typically bills at seventy-five to one hundred fifty dollars per hour, plus a setup cost for programming the toolpath, which makes a single part relatively expensive but rewards small batches. A simple plastic part might land between one hundred and five hundred dollars, while metal parts, aluminum or steel, generally run two hundred to a thousand dollars once tool changes and setup are factored in. CNC becomes the more economical choice roughly in the one-to-twenty-unit range, and stays competitive well past that for parts needing tight tolerances or a metal finish that 3D printing cannot easily replicate.
Injection molding: expensive to start, cheap to repeat
Injection molding inverts the cost logic entirely. Tooling, the mold itself, is the dominant expense, ranging from roughly fifteen hundred to eight thousand dollars for soft aluminum tooling used in low-volume runs, up to well over one hundred thousand dollars for complex, multi-cavity steel molds built for mass production. Once that mold exists, however, the per-unit cost of each additional part can drop to a few dollars, sometimes under one dollar at high volumes. This is exactly why injection molding rarely makes sense for a true prototype: the upfront tooling cost only pays for itself once you’re producing hundreds or thousands of units, a scale a prototype has not earned yet.
| Method | Typical cost range | Sweet spot (volume) |
|---|---|---|
| FDM / SLA 3D printing | $50 to $300 per part | 1 to roughly 10 units |
| CNC machining | $100 to $1,000 per part | 1 to roughly 20 units |
| Injection molding (soft tooling) | $1,500 to $8,000 tooling, then $5 to $25/part | Hundreds of units and up |
These figures are approximate market ranges as of 2026, and vary by supplier, material, and part geometry. Treat them as a planning reference, not a quote, and always confirm current pricing with the specific shop or service you intend to use.
The hidden cost most budgets miss: iteration count
The biggest cost driver in prototyping is rarely the method itself. It is how many rounds of revision a team actually needs before a design is right, and that number is set far more by process discipline than by manufacturing choice. A team with a clear question for each round might finalize a part in three iterations. A team without one might still be revising after eight, at which point even the cheapest method per unit has quietly become the most expensive path overall. Multiply any of the ranges above by the number of rounds a project actually needs, not the number a proposal originally budgeted for, and the real total often looks very different from the first estimate a client signed off on.
Matching the spend to the stage of the project
Early-stage concept validation rarely justifies anything beyond 3D printing, since the question at that stage is usually about form and fit, not durability. CNC machining earns its higher cost once a design needs to survive functional testing in something close to the final material. Reserving tooling spend for injection molding until a design is genuinely close to production-ready avoids the single most common budgeting mistake we see: paying for mass-production tooling to answer a question a fifty-dollar 3D print could have settled just as well.
For the mechanics of how these methods actually get selected and sequenced during a project, see how a concept actually becomes a testable model. And for the broader argument on why fast, cheap iteration beats a single expensive, “perfect” attempt, our piece on why speed and flexibility change what teams are willing to try covers the discipline side of the equation this article’s numbers only hint at.