How do I choose between 3D printing, CNC machining, and injection molding?

Decide on four inputs: annual quantity, whether the requirement genuinely needs metal or high heat, whether the visible surface must be cosmetic Class-A, and whether the design is still changing. Production 3D printing wins roughly 10-5,000 units per year for functional parts; injection molding wins above about 5,000 units with a stable design; CNC machining wins when metal properties, sustained heat past ~150C, or precision-ground surfaces are genuine requirements.

Does CNC machining have setup costs?

Yes. CNC requires no permanent tooling, but each run typically carries setup and programming charges — commonly around $500 and up depending on part complexity and the shop — amortized across the parts in that run. This is why machined parts get expensive at low quantities and why the same part often re-incurs setup on every reorder.

At what quantity does injection molding beat 3D printing?

Commonly between a few hundred and a few thousand cumulative units, depending on tooling cost and part size. Below the crossover, printing avoids the $5,000-$40,000+ tooling investment entirely; above it, molding's low per-part cost dominates.

Should I use 3D printing if my design is still changing?

Usually yes. Printed production makes design revisions a file change rather than mold rework or new machining setups, so it is the lower-risk choice while a design is still stabilizing — even at quantities where molding would otherwise win.

Manufacturing Method Selector: 3D Print, Machine, or Mold? | Chatelet

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Manufacturing Method Selector

Four questions, thirty seconds: find out whether your part should be 3D printed, machined, or injection molded — including when the answer isn't us.

1. How many of this part per year?

2. What is the governing requirement?

3. Is the design final?

4. When do you need parts?

How the Three Processes Actually Compare

	Production 3D Printing	CNC Machining	Injection Molding
Permanent tooling	None	None	$5,000–$40,000+
Per-run setup & programming	None — validated file goes straight to the fleet	Commonly ~$500+, varies by part complexity and shop; amortized across the run and often re-incurred on reorders	Included once tooling exists
Minimum order	1	Often 10–25 to justify setup	Hundreds–thousands
First parts	~1 week	2–4 weeks	6–16 weeks
Revision cost	File change	New setup + programming	Mold rework
Sweet spot	10–5,000/yr	Metals, precision surfaces	5,000+/yr, stable design
Cosmetic surface	Layer lines visible	Machined finish	Glossy Class-A

Representative figures for typical part geometries; machining setup costs in particular vary widely by shop, part complexity, and fixturing. This tool gives directional guidance, not a quote — real recommendations come from your actual CAD, load case, and quantity.

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Send your CAD file with quantity, load case, and environment. We'll recommend the best material, process, and production path — including telling you when another process wins.

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Chatelet Manufacturing is a US-based contract manufacturer in the Orlando, Florida area, operating 85+ FDM production printers. We produce carbon fiber nylon, glass filled nylon, ASA, polycarbonate, PETG, and TPU parts from prototype through low-volume production, with turnaround as soon as one week depending on part complexity and volume.

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Manufacturing Method Selector: 3D Print, Machine, or Mold? | Chatelet

Manufacturing Method Selector

How the Three Processes Actually Compare

Get the Real Answer for Your Part

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Manufacturing Method Selector: 3D Print, Machine, or Mold? | Chatelet

Manufacturing Method Selector

How the Three Processes Actually Compare

Get the Real Answer for Your Part

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