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How much does CNC machining cost? One-off parts and small runs explained
Short answer: a CNC quote is made of programming and setup (CAM, fixturing, tool setting), machine time (driven by how much material is removed, how many sides and features, and how tight the tolerances are), material (the stock block, not just the finished part), and finishing (deburring, anodising, plating, coating). On a one-off, setup is often the largest part of the price. Ordering a few at once spreads it.
We don't publish price ranges, because shop rates vary by country, machine and material and we haven't found a sourced dataset that holds across them. The Fabrication Cost Estimator shows how size and material move an estimate.
Why is one CNC part so expensive?
Hubs notes that CNC's precision "comes at a higher cost, especially for low-volume production or custom, one-off parts" (Hubs). Before the first chip is cut, the machinist programs toolpaths, designs or adapts a fixture, loads tools and proves out the program. For a single part, all of that is charged to one piece. The second and third parts reuse it.
What makes CNC machining more expensive?
| Driver | Why it adds cost |
|---|---|
| Number of setups | Each time a part is flipped or re-clamped is more setup and risk. Hubs notes complex orientations need "custom fixtures and jigs" |
| Tight tolerances | Slower cuts, more inspection. Only tolerance what actually matters |
| Deep pockets, thin walls, small internal radii | Need long, small tools and slow feeds |
| Material | Harder metals cut slower; stock size matters, and Hubs notes non-standard blanks can increase cost |
| Threads and holes | Tapping, reaming and inserts add operations |
| Finish | Anodising, powder coating, plating or polishing are often outsourced |
How can I reduce the cost of a CNC part?
- Relax non-critical tolerances. Mark only the dimensions that matter.
- Allow internal corner radii instead of sharp inside corners.
- Design for fewer setups, with features reachable from one or two sides.
- Choose a free-machining material where strength allows, such as aluminium instead of stainless steel.
- Order a few spares. Setup is paid once.
- Consider 3D printing for prototypes. Hubs says additive is "typically more affordable than CNC for quantities under 10 units" (Hubs). See what custom 3D printing costs.
The Tap & Drill Size Chart and Feeds & Speeds Calculator help when you're specifying threads or checking a design.
What should I send for a CNC quote?
- STEP file (preferred) plus a drawing with tolerances, threads and surface finish, if anything is critical
- Material and temper, or what the part must withstand
- Quantity, and prices for two or three quantities if you're flexible
- Finish: as-machined, bead-blasted, anodised (colour), powder coated
- Deadline and delivery country
No CAD? Photos of the original part with a calliper in shot, plus key dimensions, let a maker reverse-engineer it. Modelling is quoted separately.
Should I use an instant-quote service or a local machinist?
With a finished STEP file and a need for certificates, an instant-quote platform is quick (see Xometry vs The Spool List for one-off parts). For repairs, reverse-engineering or a part you can only describe, a machinist who'll talk it through usually fits better. On The Spool List CNC market makers with verified CNC machines quote your job. You pay the quote with no buyer fee, and the payment is protected until you confirm delivery.
Sources
- Hubs: 3D printing vs CNC machining (checked 27 October 2026)
FAQ
Why does a single CNC part cost so much? Programming, fixturing and setup are paid in full by that one part. Ordering a few spreads the setup.
What file do machinists want? A STEP file, plus a drawing for tolerances, threads and finish when they matter.
Can a machinist copy a broken part without a drawing? Often. Send clear photos with a measuring tool in shot and key dimensions; reverse-engineering is quoted separately.
Is aluminium cheaper to machine than steel? It usually machines faster, which reduces machine time. Material prices vary, so ask for both if you're flexible.
Post it free and let makers bid. Your payment is protected until you confirm delivery.