Transport & Manufacturing
3D Printing FDM Extrusion Flow Rate & Line Width Sizer
Calculate 3d printing fdm extrusion flow rate & line width using the stated engineering or scientific relationship and adjustable field inputs.
Preparing your result…
What this calculator does
Calculates 3D Printing FDM Extrusion Flow Rate & Line Width Sizer using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Rounded-bead area ≈ h(w − h) + πh²/4 (w ≥ h); volumetric flow Q = area × print speed (mm³/s); rectangular model Q = w × h × speed
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Rectangular-bead approximation Q≈width×layer height×print speed. For a rounded-rectangle bead with width w≥h, area≈h(w−h)+πh²/4, so Q=area×speed, in mm³/s for mm and mm/s.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • State the bead geometry; rectangular and rounded models give different flow. Select the slicer’s actual model and cap flow by tested hotend/material capability. Line width is an input here; solving width from a specified flow requires that flow and an explicit geometry model. Filament linear feed also needs filament diameter.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Line width (mm) | Layer height (mm) | Print speed (mm/s) | Volumetric flow (rounded bead) |
|---|---|---|---|---|
| Worked example | 0.45 | 0.2 | 60 | 4.885 mm³/s |
| Half the amounts | 0.23 | 0.1 | 30 | 0.6256 mm³/s |
| Double the amounts | 0.9 | 0.4 | 120 | 39.0796 mm³/s |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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