How do you calculate total inspection samples in additive manufacturing?

Multiply production lots by build runs per lot by samples per run. With 6 lots, 4 runs per lot, and 3 samples per run, that is 72 inspection samples required across the campaign.

How many inspection hours will a campaign take?

Multiply total samples by the per-sample inspection time. The validator's workload assumption yields an estimated 3.6 hr for these 72 samples, which is a planning figure, CT or full first-article inspection would push that much higher.

What is a good sampling rate for additive parts?

It depends on criticality and process stability. Stable, non-critical builds may sample one or two per run; flight or implant hardware often demands every part or full first-article plus periodic in-process checks. Tighten sampling until your escape rate is acceptable, then hold.

Why sample per run instead of per lot?

Each build run is its own process instance, different thermal history, recoat behavior, and position effects, so sampling per run catches run-to-run variation that a single per-lot sample would miss entirely.

How do I reduce inspection load without raising risk?

Qualify the process so you can reduce samples per run, use faster in-line metrology where tolerances allow, and reserve slow CT inspection for critical features. Cutting samples per run from 3 to 2 here would drop the count from 72 to 48.

Sampling plan vs 100% inspection for additive?

100% inspection is the safe default for critical or unqualified processes; statistical sampling is justified once you have data showing the process is in control. This calculator sizes whichever plan you choose so you can compare the workloads directly.

Additive Manufacturing calculator

Additive Inspection Sampling Calculator

Additive inspection sampling is how many parts you pull for dimensional and quality checks across a production campaign, and it scales fast: lots times runs times samples per run. Quality engineers in regulated additive work, aerospace, medical, dental, use it to size the inspection workload before a campaign starts, because under-sampling risks escapes while over-sampling buries the metrology lab. It matters because inspection is often the hidden constraint that gates how fast finished additive parts can ship. The model turns a sampling plan into a concrete sample count and an estimated inspection-hour load.

What this calculator does

Estimate inspection sample count and hours for additive lots from lots, runs per lot, and samples per run.
a quality engineer needs to estimate AM inspection workload for production lots or validation builds
It computes total inspection samples from production lots, build runs per lot, and samples per run, and estimates the inspection hours that workload implies.

Formula used

Total inspection samples = lots × build runs per lot × samples per run
Inspection hours are estimated at 3 minutes per sample.

Inputs explained

Additive production lots:
Build runs per lot:
Inspection samples per run:

How to use the result

Use it when planning a sampling plan for an additive campaign, staffing a metrology lab, or estimating inspection lead time before parts ship.
It assumes a fixed samples-per-run rule and a flat per-sample hour estimate; first-article and CT-scanned samples take far longer than a quick CMM touch-off, so a uniform rate can mislead on mixed inspection types.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 280.569 (BLS, Aug 2026), up 6.6% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 22,301 printing and related support establishments employing about 386,248 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate total inspection samples in additive manufacturing? Multiply production lots by build runs per lot by samples per run. With 6 lots, 4 runs per lot, and 3 samples per run, that is 72 inspection samples required across the campaign.
How many inspection hours will a campaign take? Multiply total samples by the per-sample inspection time. The validator's workload assumption yields an estimated 3.6 hr for these 72 samples, which is a planning figure, CT or full first-article inspection would push that much higher.
What is a good sampling rate for additive parts? It depends on criticality and process stability. Stable, non-critical builds may sample one or two per run; flight or implant hardware often demands every part or full first-article plus periodic in-process checks. Tighten sampling until your escape rate is acceptable, then hold.
Why sample per run instead of per lot? Each build run is its own process instance, different thermal history, recoat behavior, and position effects, so sampling per run catches run-to-run variation that a single per-lot sample would miss entirely.
How do I reduce inspection load without raising risk? Qualify the process so you can reduce samples per run, use faster in-line metrology where tolerances allow, and reserve slow CT inspection for critical features. Cutting samples per run from 3 to 2 here would drop the count from 72 to 48.
Sampling plan vs 100% inspection for additive? 100% inspection is the safe default for critical or unqualified processes; statistical sampling is justified once you have data showing the process is in control. This calculator sizes whichever plan you choose so you can compare the workloads directly.

Last reviewed 2026-08-12.