About this tool
Nozzle Layer Height & Line Width Calculator is a free, in-browser tool that turns a nozzle diameter into sensible layer-height and extrusion line-width ranges, so you can dial in a new nozzle without guesswork. Swap from a 0.4 mm to a 0.6 mm nozzle and it instantly shows the settings that keep flow and adhesion reliable. Nothing is uploaded; the maths runs on your device.
The common rules of thumb scale everything from the nozzle diameter: the recommended line width is about 1.1× the nozzle (a usable band of 1.0–1.2×), the maximum safe layer height is roughly 0.75× the nozzle, a typical layer height is about 0.5×, and the practical minimum is around 0.25×. So a 0.4 mm nozzle suggests a ~0.44 mm line width, a 0.3 mm maximum layer height and about 0.10 mm minimum.
Use it as a starting point when setting up a profile: staying under the 0.75× layer-height ceiling avoids weak inter-layer bonding, and a line width near 1.1× the nozzle gives strong, consistent extrusion. Fine-tune from there for your specific printer and material.