Manufacturing Cost Comparison by Process

Relative cost tiers for common manufacturing processes, based on what drives each cost (setup, tooling, cycle time, material). The table compares cost structure, not specific prices, because real prices depend on geometry, volume, material, finish, and the supplier. Use it to see which processes are cheap or expensive and why, then match a process to the volume and the cost driver that fits.

How to read the cost tiers

Each row gives a relative cost tier (low, medium, high), the main cost driver behind it, and the volume band the process fits. The tiers are relative, so a low-tier process costs less than a high-tier one for comparable work, not a fixed dollar figure. The driver explains where the money goes: some processes spend on setup and programming (CNC), some on tooling that amortizes over a long run (injection molding, die casting), and some on machine time and consumables (FDM, waterjet). The volume-fit column shows where each process earns its place, because the same process can be cheap at one volume and expensive at another. Reading tier, driver, and volume together predicts cost behavior better than any single number.

What drives the cost of each process

High-tier processes

CNC milling and turning sit in the high tier because each part needs programming, fixturing, and cycle time, and the cost per part falls only modestly as volume rises.

Low- to medium-tier processes

FDM sits at the low end because setup is minimal and the cost is mostly machine time and filament, which suits one-off and low-volume work. SLA and SLS or MJF land in the medium to high band because resin and powder, plus post-processing, add to the machine time. Laser cutting is low to medium because it nests many parts from a sheet with low setup, while waterjet runs medium due to slower cutting and abrasive consumables. Sheet metal bending is low to medium once the blank is cut.

Tooling-heavy processes

Injection molding and die casting flip the pattern: a high up-front tooling or die cost, but a low per-part cost, which is why they only pay off at high volume.

Volume and the cost crossover

The most important pattern in the table is the volume crossover.

Low-setup versus tooling-heavy processes

Low-setup processes (FDM, laser cutting) start cheap and stay cheap per part, but they do not get much cheaper as volume grows, so they dominate at low volume. Tooling-heavy processes (injection molding, die casting) start expensive because of the mold or die, but each added part costs very little, so their per-part cost falls steeply and crosses below the additive or CNC line once the run is large enough, often in the hundreds to low thousands of parts.

CNC and the crossover point

CNC sits between: a high per-part cost that falls slowly with volume, which makes it the choice for low to medium runs where the tooling of molding is not yet justified. The crossover point moves with part size, material, and tolerance, but the shape of the tradeoff is consistent.

Choosing a process for cost

Matching the process to the volume

Match the process to the expected volume first, then to the cost driver. For a single prototype or a handful of parts, FDM, SLA, or laser cutting keeps setup low. For a low-to-medium run of functional metal or plastic parts, CNC milling or turning balances per-part cost against the avoidance of tooling. For flat sheet parts, laser or waterjet cutting plus bending covers a wide volume range cheaply. For a high-volume run of identical plastic or zinc parts, injection molding or die casting amortizes the tooling and wins on per-part cost, provided the volume clears the crossover.

Factors that push cost up the tier

Within any process, harder materials, tighter tolerances, and finer finishes push the effective cost up the tier, so relax them where the part allows.

Limitations

The tiers are relative and illustrative, drawn from cost-driver analysis, not a price list. Real cost depends on part geometry, size, material and temper, tolerance, finish, quantity, and the supplier, and a process that is cheap for one part can be expensive for another. This page compares cost structure to guide process choice; it does not quote prices or per-unit rates. For an actual part, the cost is set by a supplier quote against the specific geometry and quantity, which is outside the scope of this reference.