How do you calculate print scrap rate?

Divide scrapped printed parts by total produced parts and express as a percentage. With 9 scrapped out of 210 produced, that is 9 / 210 = 4.29% scrap.

What is a good 3D printing scrap rate?

It varies by process and material - well-tuned FDM farms often run a few percent, while metal or resin work can be tighter or looser. In the example a 4.29% rate sits just over a 4% target, a 0.29-point miss.

What does a negative gap to target mean?

Gap to target is target minus actual. A negative value like the -0.29 points here means actual scrap exceeded the target, so the print process is running above its allowed failure rate.

Print scrap rate vs print yield - how do they relate?

They are complements. A 4.29% scrap rate means a 95.71% print yield - the share of parts that came off the plate usable. Lowering scrap raises yield one for one.

How many parts did 4.29% scrap actually cost?

At 4.29% on 210 parts, 9 prints failed. Hitting the 4% target would have saved roughly one part on this batch, and the savings compound across many builds and machine hours.

Should partial or aborted builds count as scrap?

This tool counts completed-but-failed parts against total produced. Builds that crash before parts finish are usually tracked separately as build failures so you do not conflate process aborts with part-quality scrap.

Additive Manufacturing calculator

Print Scrap Rate Calculator

Print scrap rate is the share of additively manufactured parts that fail and cannot be used, out of everything a printer or print farm produced. Additive engineers, print-farm operators, and quality leads watch it because failed prints waste material, machine hours, and post-processing labor that you cannot recover. In additive, a single failed print can tie up a build plate for hours and consume expensive powder or resin, so even modest scrap rates carry real cost. This calculator converts failed-part counts into a scrap percentage and shows whether you are above or below your target.

What this calculator does

Calculate scrapped additive parts as a percentage of total produced parts and compare with a scrap target.
a quality manager needs to monitor additive scrap by material, printer, or product family
It divides scrapped printed parts by total produced parts to give a print scrap rate, then compares it to your target scrap rate to show the gap.

Formula used

Print scrap rate = scrapped printed parts ÷ total produced parts
Gap to target = target scrap rate - actual scrap rate

Inputs explained

Scrapped printed parts: undefined
Total produced parts: undefined
Target scrap rate: undefined

How to use the result

Use it per build, per shift, or per part program to quantify additive yield loss and check it against your quality target.
It weights every failed part equally regardless of print time or material cost, and counts only finished-build failures - it does not capture build crashes that abort before parts complete or post-process rejects logged elsewhere.

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 print scrap rate? Divide scrapped printed parts by total produced parts and express as a percentage. With 9 scrapped out of 210 produced, that is 9 / 210 = 4.29% scrap.
What is a good 3D printing scrap rate? It varies by process and material - well-tuned FDM farms often run a few percent, while metal or resin work can be tighter or looser. In the example a 4.29% rate sits just over a 4% target, a 0.29-point miss.
What does a negative gap to target mean? Gap to target is target minus actual. A negative value like the -0.29 points here means actual scrap exceeded the target, so the print process is running above its allowed failure rate.
Print scrap rate vs print yield - how do they relate? They are complements. A 4.29% scrap rate means a 95.71% print yield - the share of parts that came off the plate usable. Lowering scrap raises yield one for one.
How many parts did 4.29% scrap actually cost? At 4.29% on 210 parts, 9 prints failed. Hitting the 4% target would have saved roughly one part on this batch, and the savings compound across many builds and machine hours.

Last reviewed 2026-05-12.