How to Choose Layer Height: Quality vs Print Time
Contents
Cutting layer height in half almost doubles print time. So choosing the thinnest layer for every part makes no sense. On a 0.4 mm nozzle, 0.2 mm is a good start. For curved, visible surfaces people use 0.12–0.16 mm, and for quick prototypes 0.28 mm. The general limit: layer height should stay between 25% and 75% of the nozzle diameter.
What does layer height affect?
- Surface quality: On curved and sloped surfaces layers look like steps. Thin layers make those steps smaller.
- Print time: Halving layer height doubles the layer count, and time almost doubles.
- Strength: Very thin or very thick layers can weaken layer bonding. Middle values usually give the strongest bond.
- Vertical detail: Text, fine embossing and small vertical details come out sharper with thin layers.
Detail in the horizontal plane (XY) is decided not by layer height but by nozzle diameter.
Range by nozzle diameter
| Nozzle diameter | Thinnest (approx.) | Standard | Thickest (approx.) |
|---|---|---|---|
| 0.2 mm | 0.05 mm | 0.10 mm | 0.15 mm |
| 0.4 mm | 0.10 mm | 0.20 mm | 0.30 mm |
| 0.6 mm | 0.15 mm | 0.30 mm | 0.45 mm |
| 0.8 mm | 0.20 mm | 0.40 mm | 0.60 mm |
With layers thicker than 75% of the nozzle diameter, the nozzle cannot press enough on the layer below and you get layer separation.
Choosing by purpose
| Purpose | Suggestion on a 0.4 mm nozzle |
|---|---|
| Figures, miniatures, fine detail | 0.08–0.12 mm |
| Display parts, curved surfaces | 0.12–0.16 mm |
| General use | 0.20 mm |
| Quick prototypes, boxes, brackets | 0.24–0.28 mm |
| Very fast drafts | 0.30 mm |
"Magic numbers": heights that suit the motor step
A Z axis stepper motor finds its most stable position at "full steps". If layer height is an exact multiple of this step, every layer has the same thickness and the surface comes out smoother.
Full step = Lead screw pitch (lead) ÷ Motor steps per revolution
- A 1.8° motor takes 200 steps per revolution.
- A trapezoidal screw with 8 mm lead: 8 ÷ 200 = 0.04 mm.
- A screw with 2 mm lead: 2 ÷ 200 = 0.01 mm.
With 8 mm lead screws, multiples of 0.04 are chosen: 0.08, 0.12, 0.16, 0.20, 0.24, 0.28 mm. For example, choosing 0.16 mm instead of 0.15 mm can prevent regular bands from forming. Details on this: Z banding.
Microstepping drivers can also position in between, but choosing multiples of the full step is a free improvement.
Variable (adaptive) layer height
Modern slicers can use different layer heights in different regions of the same part:
- Thick layers on flat, vertical sections and thin layers on curved, sloped sections.
- Total time gets shorter while visible surfaces stay smooth.
- PrusaSlicer: the "Variable layer height" tool.
- Cura: the "Adaptive Layers" setting.
- OrcaSlicer / Bambu Studio: "Adaptive layer height" and manually editable height ranges.
What to update when layer height changes
- Top and bottom layer count: Thickness should stay constant. Instead of 5 top layers (1 mm) at 0.2 mm you need 8–9 layers at 0.12 mm. Otherwise you get holes in the top surface.
- Speed: With thick layers the hotend has to melt more plastic. At the same speed under-extrusion can start.
- Temperature: With thick, fast layers you may need a slightly higher temperature.
- Support Z distance: Often set to one layer height. See Support settings.
- First layer height: Usually kept fixed at 0.2–0.3 mm. It tolerates small irregularities in the bed.
Consider a larger nozzle
On large functional parts, a 0.6 mm nozzle at 0.3 mm layer height prints much faster than a 0.4 mm nozzle and often gives stronger parts. The loss of detail is hardly noticeable on large parts.
Frequently asked questions
Does the thinnest layer give the best quality?
For the surface, usually yes, but time grows a lot and the gain shrinks. The difference between 0.12 mm and 0.08 mm is hard to see with the naked eye on most parts. On very thin layers, temperature and flow imbalances become more visible.
Does a thick layer make the part stronger?
Up to a point yes, because the number of layers, and so the number of weak layer interfaces, goes down. But thicknesses beyond 75% of the nozzle diameter weaken the bond.