Layer Height Explained: Speed vs Detail

Layer height in 3D printing is the thickness of each slice your printer lays down. It is one of the first settings in any slicer, and it controls the trade between speed and surface detail. This guide explains what layer height does, the limits set by your nozzle, and typical values from slicer documentation. The figures below are starting points from Prusa and OrcaSlicer documentation, not our own test results.

What does layer height do?

Prusa's documentation calls layer height the main factor affecting both print time and vertical resolution. Taller layers shorten the print significantly at the cost of more visible layer lines. A small layer height, such as 0.10 mm, gives extra detail at the cost of longer prints.

OrcaSlicer's wiki adds that smaller layer heights give a smoother finish, less noticeable layer lines, more detail on curves and better performance on overhangs. Smaller layers reduce the unsupported distance between layers, so steeper overhangs become possible, while larger layers increase sagging and need supports at shallower angles. See how to fix sagging overhangs and 3D printing supports explained.

Prusa also points out that layer height changes only the vertical resolution. Embossed text lying flat on the bed looks the same at any layer height. For finer detail in the XY plane, use a different nozzle diameter, which our nozzle sizes guide covers.

What layer height range works for each nozzle?

OrcaSlicer's wiki gives a quick reference. It says the usual optimal range is 20% to 80% of the nozzle diameter. Below 20% you may see flow inconsistencies and fish scale patterns, especially at high speed. Above 80%, layer adhesion issues and reduced quality become more likely. Prusa gives the same upper limit: stay below 80% of the nozzle diameter, and the layer height can never exceed the nozzle diameter.

Source: OrcaSlicer wiki quick reference. Check your own slicer profile, which may set tighter limits.

Which layer height should you choose?

Prusa generally does not suggest going below 0.10 mm, because the quality gain with 0.07 or 0.05 mm layers is relatively minor while print time grows a lot. Prusa's own print profiles use 0.20 mm as the first layer height. Beyond that, the choice comes down to what the part is for:

• Fast functional parts: taller layers, within the 80% limit. Time saved is large.
• General prints: the default profile for your printer and nozzle is a sensible start.
• Figurines and curved detail: thinner layers, accepting a longer print.

Print time does not depend on layer height alone. Speed and acceleration matter as well, so read print speed versus quality.

First layer height

Prusa notes that when you print with low layer heights you may still want a thicker first layer to improve adhesion, and that changing it will likely mean recalibrating the first layer. OrcaSlicer recommends 0.25 mm for a 0.4 mm nozzle (62.5% of nozzle diameter) with a maximum of 65%. If the first layer is the problem, see fixing a bad first layer.

Variable layer height

Prusa mentions a Variable layer height function, and OrcaSlicer has one too. It lets different parts of a model use different layer heights, for example thin layers on a curved top and thicker layers on straight walls. This gives a compromise between time and quality, but it is slicer specific, so check its documentation. Some visible banding can come from the printer rather than the setting, as described in fixing Z banding.

Layer height does not change how thin a feature can be in the XY plane; if details are missing, read why slicers drop small features.