3D Printing Layer Height
Layer height is the vertical thickness of each printed slice. It is the single setting with the biggest impact on surface quality and print time. This guide explains how to choose the right layer height for your nozzle, material, and print goal.
The 25–75% rule
Layer height must be between 25% and 75% of your nozzle diameter. Below 25%, the nozzle cannot extrude a consistent bead. Above 75%, there is not enough overlap between layers for good adhesion — the print becomes weak and layers separate easily.
For the most common setup (0.4 mm nozzle): minimum layer height is 0.1 mm, maximum is 0.3 mm, and the standard is 0.2 mm.
| Nozzle diameter | Min layer | Standard layer | Max layer | Detail level | Best use case |
|---|---|---|---|---|---|
| 0.2 mm | 0.05 mm | 0.1 mm | 0.15 mm | Very fine | Miniatures, jewelry, fine mechanical parts |
| 0.4 mm | 0.08 mm | 0.2 mm | 0.3 mm | Standard | General purpose — the most common setup |
| 0.6 mm | 0.12 mm | 0.3 mm | 0.45 mm | Medium | Functional parts, faster large prints |
| 0.8 mm | 0.16 mm | 0.4 mm | 0.6 mm | Coarse | Large structural parts, rapid prototyping |
| 1.0 mm | 0.2 mm | 0.5 mm | 0.75 mm | Very coarse | Large vases, terrain, very fast prints |
Layer height presets
| Preset | Height | Layers | Print time | Surface quality | When to use |
|---|---|---|---|---|---|
| Draft / Fast | 0.3 mm (0.4 mm nozzle) | Fewest | Fastest | Visible layer lines | Rapid prototypes, test fits, non-visible parts |
| Standard | 0.2 mm (0.4 mm nozzle) | Medium | Medium | Visible layer lines, smooth curves | Most prints — good balance |
| Quality | 0.15 mm | More | Slower | Fine layer lines, good surface | Display models, parts with visible curved surfaces |
| Fine / Detail | 0.1 mm | Many | Slow | Nearly invisible layer lines | Miniatures, detailed models, small mechanical parts |
| Ultra fine | 0.05–0.08 mm | Most | Very slow | Smooth surface, long print time | Jewelry, tiny figurines — 0.2 mm nozzle recommended |
Layer height vs. print time
Layer height has a near-linear effect on print time — halving the layer height roughly doubles the print time (more layers = more time). A model that takes 2 hours at 0.2 mm will take approximately 4 hours at 0.1 mm and about 1.5 hours at 0.3 mm.
This makes layer height the most powerful lever for reducing print time without changing any other quality setting. For structural parts where surface appearance doesn't matter, 0.3 mm at standard speeds is often the best choice.
Layer height and strength
Thicker layers are not automatically weaker — in many cases the opposite is true. Thicker layers have more thermal mass per layer, which improves bonding between adjacent layers. Thin layers (0.08–0.1 mm) can be more brittle in the Z axis because each layer has less material and bonds at a lower temperature.
For maximum part strength: use 0.25–0.3 mm layers and increase wall count (3–4 perimeters) rather than reducing layer height. Infill percentage has a greater effect on strength than layer height for most load cases.
Variable layer height
Variable layer height automatically adjusts layer height through a print — using thin layers where the model has fine detail or curved surfaces, and thick layers on flat vertical walls where it doesn't matter. This reduces print time by 20–40% compared to printing the entire model at the fine layer height.
Available in PrusaSlicer (Plater → Variable layer height paintbrush), OrcaSlicer (similar), and BambuStudio. The slicer analyzes model geometry and suggests a layer height map — you can adjust manually or accept the automatic suggestion.
First layer height
The first layer should always be set to a taller height than subsequent layers — typically 0.2 mm regardless of the overall layer height. A taller first layer deposits more material against the bed surface, improving adhesion. Even when printing a detailed model at 0.1 mm, keep the first layer at 0.2 mm.
In OrcaSlicer and PrusaSlicer: Quality → First layer height → 0.2 mm (or 50% of nozzle diameter). In Bambu Studio: this is handled automatically by the filament profile.