Print Time Estimate Calculator
This calculator estimates the extrusion time for a 3D print by dividing the total model volume (in cubic millimeters) by the volumetric flow rate of your printer (in mm3 per second). Volumetric flow rate captures the combined effect of layer height, line width, and print speed. While slicer software provides more accurate estimates by modeling individual moves, this approach gives a fast first approximation useful for scheduling print queues, quoting jobs, or benchmarking printer speeds.
Print time formula
Time (s) = Volume (mm3) / Flow rate (mm3/s)
Time (min) = Time (s) / 60
Time (hr) = Time (s) / 3600
Where flow rate = layer height (mm) * line width (mm) * print speed (mm/s). This gives the theoretical extrusion time excluding travel, acceleration, and startup.
Improving print time estimates
- Acceleration limits mean real print speed is lower than set speed for short moves. Add 20 to 40% to account for this on small, detailed prints.
- Infill pattern affects time. Grid or gyroid infill is faster than honeycomb at the same percentage.
- Perimeters are typically printed slower than infill, reducing average volumetric flow.
- Cooling fan pauses, layer cooling waits, and filament changes add time not captured here.
- Multi-colour prints with tool changes can add several minutes per colour switch.
Print time estimate calculator: frequently asked questions
What is volumetric flow rate in 3D printing?
Volumetric flow rate (mm3/s) is the volume of filament extruded per second. It combines layer height, line width, and print speed: flow = layer height * line width * print speed. Most consumer printers run 5 to 15 mm3/s; high-flow setups can reach 30 mm3/s or more.
How do I find the model volume?
Your slicer reports model volume in the print statistics panel. You can also calculate it from CAD software. Ensure you use the volume of the printed object excluding voids, then account for infill percentage separately.
Why does my slicer estimate differ from this calculator?
Slicer estimates are far more detailed: they account for travel moves, retractions, acceleration ramping, and varying speeds for perimeters versus infill. This calculator gives a quick ballpark estimate from volumetric flow alone.
What is a typical volumetric flow rate?
Standard hotends with a 0.4 mm nozzle at 200 mm/s print speed, 0.2 mm layer height, and 0.4 mm line width produce about 16 mm3/s. A Volcano or high-flow nozzle at the same speed can double that.
Does print time include heating and cooling?
No. This estimate covers extrusion time only. Add roughly 5 to 10 minutes for bed and hotend heating, plus any cooling time for temperature-sensitive materials.
Official sources
- NIST: Measurement Needs for Additive Manufacturing.
- America Makes: americamakes.us (National Additive Manufacturing Innovation Institute).
Reviewed by the CalculatorHub team, edited by James Graham, 15 June 2026. See our methodology.