The true cost of failed 3D prints.

A failed print does more than waste filament or resin. It occupies a printer, uses electricity, consumes setup and cleanup time, delays the queue, and may force you to remake an order at the worst possible moment. The useful business question is not only how many prints fail. It is how much those failures add to every good part.

Use observed attempts and failures

Start with one product family, printer model, or process that behaves consistently. Count every completed attempt during a useful period and mark which attempts produced no sellable output. Ten failures out of one hundred attempts is a 10% observed failure rate. Mixing tuned PLA jobs with experimental engineering materials can hide the process that actually needs attention.

A partial defect needs a consistent rule. If a part can still be sold at full value, count it as a success. If it requires discounted sale, repair, or extra finishing, record that cost separately instead of pretending it was either a perfect success or a total loss.

Build the cost of one attempt

The calculator combines costs that occur each time you start the job: material, occupied machine time, electricity, and hands-on labor. Material should include supports, brims, purge, prime towers, resin left on supports, and other consumables tied to that attempt. Machine time should use the same depreciation and maintenance rate used in your normal pricing method.

Recovery value belongs only where it is real. Reusable magnets, inserts, hardware, or an undamaged fixture can reduce a failed job's net loss. Do not assign optimistic salvage value to contaminated resin, damaged customer material, or plastic that your operation cannot actually reuse.

Calculate the cost per good part

Successful orders must carry the cost of unsuccessful attempts. With one hundred attempts, ten failures, and a $12 cost per attempt, production consumed $1,200 but created only ninety good parts. The expected production cost is therefore $13.33 per good part, not $12.

The difference between direct attempt cost and failure-adjusted cost is the failure premium. Add that premium before marketplace fees and profit margin. Otherwise a price can look profitable on a successful run while the monthly business quietly loses money to remakes.

Why simply adding the failure percentage is slightly wrong

If the success rate is 90%, the expected attempts required for one good part are 1 ÷ 0.90, or about 1.111. Multiplying cost by 1.10 understates the expected cost. The exact relationship becomes more important as the failure rate rises.

Use the loss total to choose the next fix

Monthly and annualized loss make reliability work easier to prioritize. If one recurring failure mode costs $180 per month, a better build surface, enclosure, dryer, replacement FEP, spare hotend, or several hours of profile tuning may have a short payback. Record the cause of each failure so the largest category becomes visible.

• Separate adhesion, support, extrusion, power, file, and operator failures.
• Track how far into the job the failure occurred when lost time varies widely.
• Review high-value and deadline-sensitive jobs separately from routine stock.
• Update the rate after a meaningful process change instead of carrying old failures forever.