Maker and DIY Calculators
Nozzle layer height.
Layer height is tied to your nozzle size. Check the limit, count the layers a model needs and see how a different layer height changes the layer count, which is a rough guide to print time.
Layer height should stay below 80% of the nozzle diameter. For a 0.4 mm nozzle the maximum is about 0.32 mm. A 50 mm tall model at 0.2 mm layers with a 0.2 mm first layer has 250 layers.
Nozzle and model
Layer height
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Worked example
With a 0.4 mm nozzle the limit is 0.4 x 0.8 = 0.32 mm. A 0.2 mm layer is 50% of the nozzle, within the limit. A 50 mm model with a 0.2 mm first layer has 1 + (50 - 0.2) / 0.2 = 1 + 249 = 250 layers. At 0.32 mm layers the count falls to 157, 63% of the 0.2 mm count; at 0.08 mm it rises to 624.
How it works
Layer height is the thickness of each printed layer. Taller layers print faster and show more visible steps; shorter layers give finer vertical detail. The layer must also fit under the nozzle: it cannot exceed the nozzle diameter, and the guide below recommends staying under 80% of it.
Layer count is the first layer plus the remaining height divided by the layer height, rounded up. The comparison table uses steps of 20%, 40%, 60% and 80% of the nozzle diameter, our own choice of evenly spaced steps rather than a published standard, and assumes time follows layer count, which is only a rough guide.
Sources (opened 2026-10-08). Layers and perimeters | Prusa Knowledge Base for: layer height is the main factor affecting print time and vertical resolution; taller layers shorten print time at the cost of more visible layers; layer height should be below 80% of the nozzle diameter (about 0.32 mm for a 0.4 mm nozzle) and cannot be higher than the nozzle diameter. The layer count formula is arithmetic.
FAQ
What is the maximum layer height for a 0.4 mm nozzle?
About 0.32 mm, which is 80% of the nozzle diameter. Prusa's knowledge base gives this as the guideline, and notes the layer height cannot exceed the nozzle diameter.
How does layer height affect print time?
Taller layers shorten print time at the cost of more visible layers; shorter layers raise vertical resolution and time.
How many layers will my print have?
The first layer plus the remaining height divided by the layer height, rounded up. Enter your model height and layer heights above.
Does layer height change horizontal detail?
No. Layer height sets vertical resolution only; for more detail in the XY plane use a nozzle with a different diameter.
Should the first layer be the same height?
Not necessarily. Many people print a thicker first layer for adhesion. Enter your slicer's first layer height to keep the layer count right.
Disclaimer
Estimates from the numbers you enter. Slicer settings and printer limits vary; check results in your slicer.