Buyer Guide
Injection Mold Cost Guide for Plastic Parts
Mold cost moves with part size, steel, cavity count, undercuts, texture, tolerance, runner choice and expected mold life.
Why this matters
Mold cost moves with part size, steel, cavity count, undercuts, texture, tolerance, runner choice and expected mold life. Cost comparison is only useful when quotes share the same mold life, steel, cavity count, runner system and sample evidence assumptions.
Buyer checks
Confirm part size, weight and maximum projected areaSeparate prototype, bridge, production and export mold expectationsDefine target mold life and annual volumeList undercuts, sliders, lifters, inserts and polish or texture needsAsk which T1, correction and inspection steps are included
Quote variables
| Quote variable | Why it changes the mold route |
|---|---|
| Part geometry | Size, wall balance, ribs, bosses and undercuts change machining and mold structure. |
| Mold life | Shot expectation drives steel, hardness, components and maintenance planning. |
| Cavity count | Multi-cavity tools raise upfront cost but can lower part cost when demand is stable. |
| Runner choice | Hot runner cost can be justified by resin waste, cycle time or quality needs. |
Common mistakes
Comparing a prototype mold quote against a production mold quoteIgnoring correction rounds and T1 sample evidenceForgetting export standards, spare parts or documentation costs
How to apply it
Send the same CAD package and assumptions to every supplier, then compare what is included in the mold asset and T1 release path. If the project is early, the guide can show whether the next move is CAD cleanup, DFM review, prototype tooling, production mold planning, export mold handoff or repair review.