3D Print Time Estimator
Estimate how long a 3D print will take from the amount of plastic it uses and how fast your printer can push it. Enter the total extruded volume (the figure your slicer reports for the model including infill and shells), the average volumetric flow rate and an allowance for non-printing time, and the tool returns the print duration in hours and in hours:minutes.
Enter Values
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter the object's material volume in cm³ — use the 'material' or 'filament used' volume from your slicer, which already includes infill and walls.
- Enter the average volumetric flow rate in mm³/s (default 8 for a typical 0.4 mm nozzle), or leave it blank to use the default.
- Set the non-print overhead percentage (default 15%) to cover travel, retractions and heat-up, then read the estimated print time.
How it works
The base extrusion time is the plastic volume divided by the flow rate: volume (cm³) is multiplied by 1000 to convert to mm³, then divided by the average flow rate in mm³/s to give seconds. That figure is multiplied by (1 + overhead/100) to account for time the nozzle spends not laying plastic — travel moves, retractions, Z-hops and warm-up. The result is converted to decimal hours and to whole hours and minutes.
Worked example
Worked example. A 50 cm³ model at 8 mm³/s with 15% overhead: 50 × 1000 = 50,000 mm³; 50,000 / 8 = 6,250 s; × 1.15 = 7,187.5 s = 1.997 h, which rounds to about 2 h 0 min. The effective flow rate including overhead is 9.2 mm³/s.
Common mistakes
- Using the model's solid geometric volume instead of the extruded material volume — infill percentage and shell count change how much plastic is actually laid down.
- Assuming the printer reaches the full flow rate everywhere; small perimeters, sharp corners and outer-wall speed limits pull the average well below the hotend's peak.
- Setting overhead to zero — travel, retraction and heat-up always add real minutes, especially on models with many separate islands.
Frequently asked questions
Is this as accurate as my slicer's estimate?
No. The slicer walks the actual toolpath and applies the real speed of every move, so its prediction is more accurate. This tool is a quick first-pass sanity check when you only know the volume and a rough flow rate.
What average flow rate should I use?
It depends on layer height, line width and print speed (roughly layer height × line width × speed). For a 0.4 mm nozzle, 5–12 mm³/s is common; 8 mm³/s is a reasonable default. Use the Max Volumetric Flow Rate Calculator to work out yours.
Related tools
- Max Volumetric Flow Rate Calculator
- Filament Remaining Calculator
- Resin Volume to Weight Calculator
- Infill Material Volume Calculator
- Extruder E-Steps Calibration Calculator
- Nozzle Line Width & Layer Height Calculator
Explore more in 3D Printing & Fabrication.
Tip: Enter any known values to calculate the remaining results.
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