3D Printing Sensitivity Analysis Calculator
Estimate how changes in filament prices, print speed, machine rates, and failure rates can affect the expected cost of a 3D print.
Overview
Use this 3D printing sensitivity analysis calculator to compare your current expected cost per completed print with a scenario that changes filament pricing, effective print speed, or machine operating cost. It also accounts for an estimated failure rate so you can see how repeated attempts affect the cost of a successful part.
How it works
The calculator first adds material cost and machine running cost for one print attempt. It then divides that amount by the expected success rate, calculated as 100% minus the failure rate, to estimate the cost of producing one successful print. For the scenario, material and hourly machine costs are adjusted by the percentages entered. Effective print speed changes print time inversely: for example, a 20% speed increase changes an 8-hour print to about 6.67 hours. This is a simplified what-if model, so it keeps the failure rate constant.
How to use this calculator
- 1Enter the filament weight estimated by your slicer for one completed print.
- 2Add your material price per kilogram and your baseline print time.
- 3Enter an hourly machine rate that reflects the costs you want to track.
- 4Estimate the percentage of attempts that fail and must be rerun.
- 5Adjust the scenario changes for material price, print speed, and machine rate.
- 6Compare the scenario cost and time change with the baseline results.
Example Calculation
Filament used per successful print
150
Filament price per kg
$25
Baseline print time
8
Machine cost per hour
$2
Expected print failure rate
10%
Filament price change
10%
Print speed change
20%
Machine hourly rate change
0%
Scenario expected cost per successful print
$15.69
At baseline, the expected cost is about $18.06 per successful print. With filament costing 10% more and a 20% effective speed increase, the scenario cost is about $16.94, a reduction of about $1.12 per successful print.
Frequently asked questions
What is a 3D printing sensitivity analysis?
It is a what-if comparison that shows how changes in factors such as material price, print speed, operating cost, and failure rate can affect the estimated cost of a completed print.
Why does the calculator include a print failure rate?
Failed attempts consume material and machine time. Allowing for the expected failure rate provides a more realistic estimated cost per successful part than using one attempt alone.
Does increasing print speed always reduce total printing cost?
It usually reduces machine time in this model, but a faster print can also affect quality and reliability. If speed changes your real failure rate, update that input to reflect your expectation.
What should I include in the machine cost per hour?
You can include electricity, maintenance, wear items, depreciation, labor, or overheads according to the purpose of your estimate. Use a consistent rate when comparing scenarios.
Can I use this calculator for resin printing?
Yes. Enter the estimated resin weight or equivalent material weight, its price per kilogram, print duration, and the operating rate that suit your process.
Why is scenario print time calculated inversely from speed?
For a simplified estimate, a 20% increase in effective speed means the job takes one divided by 1.20 of its original time. Actual slicer time can differ because of travel moves, acceleration, cooling, and minimum layer times.
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Assumptions and warnings
Assumptions
- Each failed attempt is assumed to use the same material and machine time as a typical successful attempt.
- The stated failure rate is assumed to remain unchanged when print speed, material price, and machine rate change.
- A print speed change is treated as an equal inverse change in print time; it does not model quality limits, cooling constraints, or acceleration settings.
- Machine cost per hour can include any costs you choose, but the calculator does not add taxes, shipping, setup time, or post-processing unless you include them in that rate.
- Results are planning estimates and depend on actual slicer estimates, material use, and production conditions.
Warnings
- This calculator provides cost estimates only and is not financial or professional manufacturing advice.
- Increasing print speed can affect part quality and failure rates, which are not automatically adjusted in this model.