Calculate
Failed 3D print costs depend on what was actually lost. An early failure may consume less filament and machine time than a complete failed job, while repeated preparation can still be expensive. This article distinguishes observed losses from a full-cost retry model. Both can be useful, but they must not be presented as the same calculation or as a guaranteed future failure rate.
Record the inputs before calculating
For each attempt record success/failure, grams consumed, elapsed machine hours, electricity basis, repeated hands-on work and recoverable material. Define failure as a share of attempts, not a percentage markup on price. A batch setup cost may occur once; removal or cleanup may recur for every failed attempt. Count each in the place where it actually happens.
Worked example and formula
Illustrative numbers only. Replace every assumed measurement, price, rate and performance factor with evidence for your situation. A 2026 review date does not turn an example into a current market quotation.
100 attempts − 10 failures = 90 successes
10 × USD 2 / 90 = USD 0.2222 failure cost/success
USD 5 + USD 0.2222 = USD 5.2222
Full-cost failure assumption: USD 5 / (1 − 0.10) = USD 5.5556
Assume 100 attempts yield 90 successes. A successful production attempt costs USD 5, while ten early failures average USD 2 each. The failed-attempt allocation is USD 20/90, so production cost per success is approximately USD 5.22 before other costs. If every failure instead consumes the full USD 5, the complete-attempt model gives USD 5/0.9, or USD 5.56. These are fictional observations, not printer benchmarks.
Interpret the result correctly
The retry model assumes stable, independent attempts with the same failure probability and the specified cost of a failed attempt. A systematic file problem can invalidate that assumption. Include labour, packaging, design, maintenance and genuine fees separately where not already in machine cost. Prusa’s pricing tool illustrates that material and electricity alone do not represent every cost line. Cost recovery is different from choosing a profit margin.
Keep the original measurements, source date, units and assumptions beside the result. Change one assumption at a time to see its effect. A comparison is meaningful only when both options use the same scope. Do not silently combine different test procedures, products, dates or fee bases. Round a purchasing quantity upward only after completing the calculation; retain enough precision for intermediate steps.
Frequently asked questions
Which measurements should I use?
Use your attempt log and the average loss at the time of failure, with clearly defined machine and labour rates.
Is the example a guaranteed result?
No. The sample is hypothetical and does not prove a future failure rate or a selling price.
What should I check before acting?
Check whether a percentage means failed attempts, waste, markup or margin, and avoid retrying one-time costs automatically.
Use the result and related tools
Compare the existing 3D-print calculator’s failure convention with your log before using it for a quote. If the assumptions differ, keep a separate observed-loss worksheet rather than force the result.
Sources and review scope
Reviewed 22 October 2026. The examples and arithmetic are original editorial illustrations, not field tests, certified designs, current price surveys or promised savings. Sources support the stated concepts; they do not certify these example inputs. The linked calculators have their own assumptions. These articles address specific decisions and complement the existing calculator guides. No Google search-volume or ranking claim is made.