3D Printing Labour Cost Formula
Learn how setup, active monitoring and post-processing time combine to estimate 3D printing labour cost.
A 3D printing labour estimate separates printer runtime from the operator time required to prepare, supervise and finish a job. This helps calculate a consistent labour cost for the full run and an average labour cost per part.
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Total Labour Cost
Where:
Add the one-off setup time, the actively monitored share of printer time and the finishing time for all parts. Then multiply those hands-on hours by the hourly labour rate.
Variables Explained
| Variable | What It Means | Unit |
|---|---|---|
| Q - quantity | Number of identical parts in the print run. | number |
| P - printTimePerPart | Estimated machine print time for one part. | hours |
| S - setupTime | One-off time to slice, prepare the printer, load material and start the job. | hours |
| M - monitoringPercent | Share of total machine time needing active operator attention. | percent |
| F - postProcessTimePerPart | Hands-on finishing time needed for one part. | hours |
| R - hourlyLabourRate | Hourly labour cost or charge-out rate used for the estimate. | currency |
Step-by-Step Calculation
Calculate total machine print time
This is the combined printer runtime for every part in the run.
totalMachinePrintTime = quantity * printTimePerPart
Calculate active monitoring time
Only the active, hands-on portion of printer runtime is treated as labour.
monitoringTime = totalMachinePrintTime * (monitoringPercent / 100)
Calculate total post-processing time
Finishing time is applied to every part.
totalPostProcessTime = quantity * postProcessTimePerPart
Calculate total labour hours
This combines setup, monitoring and post-processing labour.
totalLabourHours = setupTime + monitoringTime + totalPostProcessTime
Calculate total labour cost
The total hands-on hours are valued at the selected hourly rate.
labourCost = totalLabourHours * hourlyLabourRate
Calculate labour cost per part
The total labour cost is spread across the completed parts.
labourCostPerPart = labourCost / quantity
Worked example: 10 identical parts
Total machine print time
10 × 3
30 hours
Active monitoring time
30 × 5 / 100
1.5 hours
Total post-processing time
10 × 0.25
2.5 hours
Total labour hours
0.5 + 1.5 + 2.5
4.5 hours
Total labour cost
4.5 × 25
$112.50
Labour cost per part
112.50 / 10
$11.25 per part
Final Result
Estimated labour cost: $112.50 total, or $11.25 per part.
Assumptions
- ✓Every part uses the same print time and post-processing time.
- ✓Setup is performed once for the complete run.
- ✓Monitoring percentage represents active work rather than unattended runtime.
- ✓The hourly rate is suitable for the intended internal-cost or customer-pricing purpose.
- ✓Material, machine, electricity and shipping costs are calculated separately.
Limitations
- !Failed prints, reprints and printer downtime are not included.
- !Complex finishing work can vary significantly between parts.
- !A batch may require additional setup when it is split across build plates or machines.
- !The calculation does not determine a final customer price or profit margin.
Common Mistakes to Avoid
Counting all printer runtime as labour when the printer can run unattended.
Applying setup time to every part instead of once per run.
Leaving out part removal, washing, curing, support removal or inspection.
Using a monitoring percentage that does not reflect actual operator involvement.
Mixing labour cost with material and machine costs without tracking them separately.
Related Formulas
Frequently Asked Questions
What is the 3D printing labour cost formula?
Total labour cost equals setup time plus active monitoring time plus total post-processing time, multiplied by the hourly labour rate.
How is active monitoring time calculated?
Multiply total machine print time by the monitoring percentage divided by 100.
Why is unattended print time not fully counted as labour?
Printer runtime does not necessarily require continuous hands-on work. The monitoring percentage captures the share that does.
How do I calculate 3D printing labour cost per part?
Divide the estimated total labour cost for the run by the number of completed parts.
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