How do I choose a manufacturing process for my product?

Mainly by quantity, material, and budget: for single units and small batches — 3D printing and CNC machining; for hundreds to a few thousand — SLS/MJF printing, urethane casting, or rapid aluminum tooling; for tens of thousands and up — injection molding, die casting, and industrial sheet metal stamping.

How much does an injection mold cost?

A production steel mold typically costs from the low tens of thousands of dollars up to six figures for large or complex parts, but delivers per-unit costs of cents to a few dollars. Rapid aluminum tooling costs a fraction of that, is made in weeks, and suits runs of thousands to tens of thousands of units.

What is DFM and why does it matter?

Design for Manufacturing means designing the product from the start so it is simple and cheap to produce — correct wall thicknesses, draft angles, bend allowances, and minimal part counts. Most of a product's manufacturing cost is locked in at the design stage, so DFM belongs in the CAD from day one, not after quotes arrive.

How can I manufacture a small production run without expensive tooling?

Several bridges exist: industrial 3D printing (SLS/MJF) for hundreds to thousands of nylon parts with zero tooling, urethane casting in silicone molds for short runs of molded-quality plastic parts, sheet metal fabrication for enclosures from quantity one, and rapid aluminum molds when you need the real production plastic.

Is it cheaper to manufacture in the US or overseas?

It depends on volume, labor content, tariffs, and logistics. Overseas factories often win on per-unit price at high volume, while US manufacturing wins on speed, iteration, IP safety, and total landed cost for smaller or heavily regulated products. Compare full landed cost per unit — not factory price — before deciding.

Manufacturing Processes Guide — Injection Molding, CNC, Sheet Metal and More

The Question Worth Real Money: How Will You Make It?

After months of development, the prototype works, investors are on board — and now comes the question that is worth serious money: how do you actually manufacture it? The exact same part could be 3D printed, CNC machined, or injection molded — and the right choice depends mostly on three variables: quantity, material, and budget. Get it wrong and you pay several times more per unit, sink money into tooling you did not need, or design a product that simply cannot be made. This guide maps today's core manufacturing processes and offers a practical way to choose between them.

Rule One: Quantity Picks the Process

Every manufacturing technology prices its two cost components differently — the one-time investment (tooling, setup) and the cost per unit:

Single units to dozens — 3D printing and CNC machining: zero tooling investment, relatively high cost per part.
Hundreds to a few thousand — industrial printing (SLS/MJF), urethane casting in silicone molds, or rapid aluminum injection tooling.
Tens of thousands and up — injection molding, die casting, and industrial stamping: high tooling investment, very low cost per unit.

The exact break points shift with part size and material, but the principle is constant: what is right for a run of 50 is almost never right for a run of 50,000.

The Map of Core Technologies

Injection molding — the queen of high-volume plastic production: high precision, excellent finish, and a per-unit cost measured in cents to a few dollars. The price of admission is a steel mold that can cost tens of thousands of dollars and up. The significant recent development: rapid aluminum tooling, which costs a fraction of a steel mold, is machined in weeks, and suits runs of thousands to tens of thousands of units — a perfect bridge between pilot and mass production.

CNC machining — computer-controlled milling and turning in metals and engineering plastics. Very high accuracy, no tooling investment, ideal for functional parts, production fixtures, and small series. Modern 5-axis machining centers cut complex geometries in a single setup.

Sheet metal fabrication — laser cutting, punching, and bending of sheet stock. The fastest, most economical route to enclosures, chassis, and brackets — from the first unit to thousands, with especially short lead times.

Die casting — injecting molten aluminum, zinc, or magnesium into a steel die. The leading method for complex metal bodies at volume — from motor housings to heat sinks for electronics cooling.

Extrusion — pulling continuous aluminum or plastic profiles through a shaped die. Ideal for any constant-cross-section part: rails, tubing, structural profiles, and lighting housings — with relatively low tooling cost.

Thermoforming — shaping heated plastic sheet over a mold. The cost-effective method for covers, trays, blister packaging, and large thin-walled parts, with tooling far cheaper than injection molds.

Additive manufacturing as production — the big shift of recent years: industrial 3D printing (MJF, SLS, metal printing) is no longer just a prototyping tool but a true production method for small-to-mid series, customized parts, and geometries no other process can make — without a dollar of tooling.

Not Just Parts: Assembly and Finishing

A real product is more than a pile of parts. Production planning must also cover assembly — board soldering, sub-assembly joining, screws versus snap fits versus adhesive — and finishing: painting, anodizing, plating, printed markings, and polishing. Decisions that look cosmetic directly drive cost and durability, and a well-chosen joining method can save minutes of labor on every unit — which compounds into real money at volume.

DFM: Design It So It Can Be Made — Profitably

Design for Manufacturing is the difference between a design that works and a design that ships at a profit: uniform wall thickness and draft angles on molded parts, correct internal radii for machining, proper bend allowances in sheet metal, and fewer parts and fasteners in assembly. Experience across industries shows that the large majority of a product's manufacturing cost is locked in during design — so production thinking has to enter the CAD from day one, as an integral part of mechanical engineering, not when quotes start coming back from vendors. It is also where good industrial design proves itself: a form that survives contact with the production line.

The Modern Factory — and Where to Build

Factories themselves have changed: collaborative robots work alongside people on assembly lines, AI-driven vision systems inspect 100 percent of units instead of sampling, machine sensors flag wear before breakdown, and digital twins of production lines let engineers simulate and optimize processes before they run. For a product company, that means faster first runs and more consistent quality — and it reshapes the classic question of producing domestically in the US versus overseas manufacturing, which deserves its own analysis of tariffs, logistics, and total landed cost.

How It Works at Projects House

Product and volume analysis. We review the design, sales forecast, and budget, and define strength, finish, and compliance requirements (UL, FCC, CPSC, FDA, or ISO standards as relevant) for every part.
Process selection per part. We build a staged production strategy: often starting with printing or rapid aluminum tooling for a pilot run, moving to steel tooling once sales prove out.
DFM adaptation. Our engineers tune the design to the chosen process, cutting cost and preventing production problems before they happen.
Vendor selection and production management. We source quotes from suitable manufacturers, manage tooling fabrication, and approve first articles.
Quality control and ongoing support. We define an inspection plan, accompany the first production runs, and drive continuous improvement — the final stretch of the idea-to-product journey.

The Bottom Line

There is no single best manufacturing process — there is a right process for each part, at each quantity, at each stage of the product's life. Knowing the technology map, designing for manufacturing early, and running a smart staged strategy are what separate a profitable product from one that dies on cost. Projects House guides your product from engineering design through process selection to managed production and quality control — as part of complete product development services.

Getting close to production? Tell us about your product through the contact form — the Projects House team will help you build the most cost-effective manufacturing strategy for it.

Manufacturing Processes: Choosing the Right Way to Make Your Product