How Much Does a Custom Injection Mold Cost? A Practical Breakdown
Short answer
Most custom injection molds fall into two ranges: simple single-cavity prototype tools typically start around USD 1,500–3,000, while multi-cavity production molds with sliders, lifters or unscrewing structures range from USD 8,000 to 30,000+. Every serious quote should be backed by a DFM review so you know exactly what drives the cost.
What drives mold cost
- Cavity count — doubling cavities does not double the price, but it adds machining, steel and alignment complexity.
- Part complexity — undercuts require sliders or lifters; threads require unscrewing mechanisms.
- Steel grade — P20 for lower volumes, H13/S136 hardened steels for millions of cycles or corrosive resins.
- Surface finish — high-gloss SPI A1 finishes add polishing hours.
- Hot runner systems — add cost up front but cut part price on high volumes.
How to keep tooling cost down
Design for the volume you actually need. A bridge tool in aluminum can validate your market for a fraction of a production tool, then be upgraded later. Consolidating features, generous draft angles and uniform wall thickness all reduce machining and molding cost. Share your annual volume with your mold maker early — it changes the optimal steel, cavity count and quote more than anything else.
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