Print settings
3D Print Line Width Calculator
Translate a nozzle size and chosen ratio into a line-width target—also called extrusion width—then carry that value into wall and volumetric-flow checks.
How the calculation works
Interpret the line-width target
Enter the calculated millimeter value in the relevant line-width or extrusion-width field in your slicer. A slicer may use separate widths for external walls, internal walls, infill, supports, and the first layer, so apply the target to the feature you are evaluating instead of assuming one value controls every path.
Use the result in the next decision
For a CAD wall or shell, pass this line width to the Wall Thickness Calculator to choose a whole perimeter count. For a speed check, combine it with layer height and print speed in the Volumetric Flow Calculator. This sequence keeps wall geometry separate from the hotend flow limit.
Worked example
A 0.4 mm nozzle at 112% targets a 0.448 mm extrusion line. Three simple adjacent lines preview a 1.344 mm wall; use 0.448 mm as the input for the next wall or flow calculation rather than substituting the 0.4 mm nozzle diameter.
Assumptions and limitations
The arithmetic converts a requested ratio into a slicer target; it does not prove that the printer deposits that exact width. Material, temperature, speed, flow calibration, feature type, and adaptive-width behavior can change the printed result. Confirm the final path in slicer preview and validate critical dimensions with a representative print.