Buyers typically pay for tooling amortized over a small production run plus per-part production costs. The main cost drivers include mold setup, material, cycle time, labor, and any secondary operations. Cost estimates depend on part complexity, resin selection, and run length.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Mold Amortization (per run) | $2,000 | $6,000 | $15,000 | Based on 1-4 cavity molds |
| Material (per part) | $0.25 | $0.60 | $2.00 | Virgin vs. recycled resin |
| Cycle Time (sec) & Throughput | 20 | 40 | 90 | Higher time lowers hourly efficiency |
| Labor (per hour) | $40 | $60 | $90 | Operator plus setup |
| Tooling/Setup Time | 0.5–2 h | 2–6 h | 8+ h | Dependent on part complexity |
| Secondary Operations | $0 | $0.50 | $5 | Trimming, painting, labeling |
| Shipping/Delivery | $50 | $300 | $1,000 | Distance dependent |
| Warranty/Quality | $0 | $0.10 | $0.50 | Rejected parts risk |
Assumptions: region, specs, labor hours.
Overview Of Costs
The typical short-run injection molding project ranges from roughly $4,800 to $26,000 total, depending on mold complexity and run length. For per-unit pricing, expect a broad spread: $0.25–$2.00 for material, plus $0.50–$3.50 for the shared mold amortization and process overhead over the number of parts produced. The exact totals hinge on resin choice, part geometry, and post-processing needs.
Cost Breakdown
Key components and how they contribute to the total cost. The following table consolidates the main drivers for a typical short-run project and helps compare options.
| Materials | Labor | Equipment | Permits | Delivery/Disposal | Warranty | Overhead | Taxes |
|---|---|---|---|---|---|---|---|
| $0.25–$2.00/part | $0.50–$3.00/part | $0.10–$0.30/part | $0–$200 | $10–$100/part | $0–$0.50/part | $0.20–$0.60/part | 5–9% |
Pricing Variables
Several factors can shift pricing significantly. Part complexity, wall thickness, and surface finish drive material usage and cycle time. Resin selection (standard commodity vs. engineering grade) alters material cost and processing stability. Tooling factors include mold material, cavity count, and runner/gate design, which affect amortization and setup time.
Ways To Save
Strategies to reduce short-run costs include selecting standard resins, simplifying geometry, minimizing secondary operations, and aligning production schedules with lower-variable-rate shifts. Negotiating tooling sharing, reducing setup time, and optimizing cycle efficiency through process validation also lower per-unit costs.
Regional Price Differences
Prices vary by region in the U.S. For a 1–4 cavity mold, the same project can be 10–20% cheaper in the Midwest versus the West Coast, with Suburban areas often closer to national averages. Rural shops may offer lower rates due to lower overhead but can incur higher freight. These deltas affect both fixed mold costs and per-part material/labor rates.
Labor, Hours & Rates
Labor costs are a major portion of the short-run budget. Typical shop rates range from $40–$90 per hour, depending on technician experience, automation level, and regional wage norms. Setup time can add a disproportionate share of the early costs, especially for complex geometries or tight tolerances.
Real-World Pricing Examples
Three scenario cards illustrate common outcomes for short runs.
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Basic — Part: simple hollow cap, 2-cavity mold, standard PP resin, 1,000 parts.
- Labor: 6 hours; Cycle time: 40 seconds
- Materials: $0.40/part
- Total: $5,000–$7,000; per-unit $1.10–$2.40
- Notes: Minimal secondary ops; modest tooling cost
-
Mid-Range — Part: ergonomic enclosure, 4-cavity mold, engineering regrind resin, 5,000 parts.
- Labor: 12 hours; Cycle time: 50 seconds
- Materials: $0.70/part
- Total: $18,000–$24,000; per-unit $0.80–$1.50
- Notes: Moderate tooling and secondary ops; tighter tolerances
-
Premium — Part: safety component, 6-cavity mold, specialty resin, 20,000 parts.
- Labor: 40 hours; Cycle time: 60 seconds
- Materials: $1.50/part
- Total: $60,000–$120,000; per-unit $0.85–$1.60
- Notes: High tooling cost, possible post-processing, strict QA
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