About this tool
3D Print Time Estimator is a free, in-browser tool that gives a quick estimate of how long an FDM print will take from four numbers: the model's volume, your layer height, line (extrusion) width and print speed. It is a fast sanity check before you open a slicer, computed locally with nothing uploaded.
The method models the extruder as laying down plastic at a volumetric rate: flow = layer height × line width × print speed, in mm³/s. Dividing the model volume (converted from cm³ to mm³) by that flow gives the raw printing time; a travel/overhead percentage adds an allowance for non-printing moves, retractions and acceleration so the estimate is more realistic.
Use it to compare how layer height or speed change a job's length, or to ballpark a batch. It is intentionally a simple flow-based estimate — a slicer's figure accounts for perimeters, infill pattern and cooling waits — but it is close enough to plan around, and it updates instantly as you tweak settings.
Frequently asked questions
How is the print time calculated?
It divides the model volume by the volumetric flow rate, where flow = layer height × line width × print speed (mm³/s). A model of 20 cm³ at 0.2 mm layer, 0.4 mm width and 60 mm/s flows at 4.8 mm³/s, giving roughly 70 minutes before the overhead allowance.
Why does my slicer show a different time?
A slicer accounts for perimeters versus infill at different speeds, infill pattern, travel moves, retractions, acceleration limits and cooling pauses. This tool is a single flow-rate estimate, so treat it as a ballpark; raise the overhead percentage to close the gap.
What should I put for the overhead percentage?
It adds time for travel moves, retractions and acceleration that are not solid extrusion. 10–20% suits most parts; complex models with many small islands and lots of travel run higher.
Where do I get the model volume?
Most slicers and mesh tools report it, or you can estimate it. Enter it in cm³ (equal to millilitres); the tool converts to mm³ internally. All math runs in your browser.
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