How do you calculate good parts per build?

Multiply nested parts per build by available builds for gross parts, then multiply by uptime and yield. Here 38 x 5 = 190 gross, and at 92% uptime x 96% yield you expect 167.808 good parts.

Why are good parts lower than gross parts?

Downtime and scrap erode the gross. From 190 gross parts, machine downtime costs about 15.2 parts and failed or rejected prints cost about 7.0 more, leaving roughly 167.8 good parts.

What is a good print yield for additive manufacturing?

Mature polymer processes hit 95-99% part yield, while metal and demanding geometries run 85-95%. The 96% default here is solid for a stable, well-qualified process.

How does machine uptime affect parts per build?

Uptime scales the whole batch. At 92% uptime you lose about 15.2 of 190 gross parts to downtime before yield is even applied, so pushing uptime is often the biggest lever on output.

How many builds do I need to hit an order quantity?

Divide the order by good parts per build. Since one set of 5 builds yields 167.808 good parts, an order of 500 needs about three such sets - and you should add a margin for variability.

Should I overbuild to cover scrap?

Yes - if you need exactly 167 good parts you have almost no buffer, since the 167.808 estimate assumes average uptime and yield. Add a few percent overbuild to absorb a bad build.

Additive Manufacturing calculator

Parts Per Build Calculator

Parts Per Build projects how many good, sellable parts a set of build runs will actually produce after machine downtime and print failures take their cut. AM production planners and operations managers use it to turn a nominal nest count into a committable delivery quantity. Gross math - nested parts times builds - always overstates output because printers don't run 100% of the time and not every part passes inspection. By layering uptime and yield on top of the nest, this calculator gives a realistic good-parts figure for scheduling, capacity promises, and overbuild decisions.

What this calculator does

Estimate good parts per additive build from nested capacity, scheduled builds, machine uptime, and print yield.
a production manager needs expected good part output from one machine or process window
It computes good parts expected by multiplying gross nested parts by machine uptime and expected print yield.

Formula used

Gross parts = nested parts per build × available builds
Good parts = gross parts × machine uptime × expected print yield

Inputs explained

Nested parts per build:
Available build runs:
Machine uptime:
Expected print yield:

How to use the result

Use it when committing delivery quantities, sizing overbuild, or checking whether available builds can meet an order.
It uses single average uptime and yield factors and won't capture batch-specific failure clusters or learning-curve improvements across builds.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 319.371 (BLS, May 2026), up 19.5% 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 good parts per build? Multiply nested parts per build by available builds for gross parts, then multiply by uptime and yield. Here 38 x 5 = 190 gross, and at 92% uptime x 96% yield you expect 167.808 good parts.
Why are good parts lower than gross parts? Downtime and scrap erode the gross. From 190 gross parts, machine downtime costs about 15.2 parts and failed or rejected prints cost about 7.0 more, leaving roughly 167.8 good parts.
What is a good print yield for additive manufacturing? Mature polymer processes hit 95-99% part yield, while metal and demanding geometries run 85-95%. The 96% default here is solid for a stable, well-qualified process.
How does machine uptime affect parts per build? Uptime scales the whole batch. At 92% uptime you lose about 15.2 of 190 gross parts to downtime before yield is even applied, so pushing uptime is often the biggest lever on output.
How many builds do I need to hit an order quantity? Divide the order by good parts per build. Since one set of 5 builds yields 167.808 good parts, an order of 500 needs about three such sets - and you should add a margin for variability.

Last reviewed 2026-05-12.