Z-banding: regular horizontal bands on the wall of a print
Z-banding is a 3D printing flaw that shows up as regular horizontal bands on the side walls, because the print head or the bed does not move perfectly evenly on the Z axis.
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Contents
Why bands appear
On most printers the Z axis moves on a threaded rod, see lead screw. If the rod is slightly bent, mounted with play or the motor moves in uneven steps, layers are laid down at regularly varying heights and a pattern with an equal spacing forms on the wall.
The bands therefore repeat at equal intervals. If they are irregular and have no rhythm, it is a different problem, for example under-extrusion.
Regular bands can also be told by touch. If you run a fingernail down the wall, you feel regular ridges the same distance apart.
How to tell Z-banding from other flaws
- Z-banding: the band spacing is the same over the whole height and visible on all walls.
- Ghosting: ripples appear behind edges and corners and do not change with height, see ghosting.
- Layer change: if the layer thickness varies, it may be adaptive layers, and that is deliberate.
What it means for quality
Z-banding is mostly a cosmetic flaw and does not change the strength of a part much. It is most visible on dark, glossy and smooth surfaces with large rounded walls, such as vases and spheres.
A smaller layer height helps, as it softens the bands, but it lengthens the print. We print with a layer height of 0.2 mm.
For your order
If you want an exceptionally smooth surface, tell us in a note. Matt colours and texture hide bands better than glossy surfaces. We photograph the batch before dispatch. We do not offer sanding or other surface finishing as a service.
Common questions
Is Z-banding a fault in the file?
No, it arises on the printer, not in the model.
Does Z-banding reduce strength?
Not in principle. They are minor differences in layer height.
Can Z-banding be removed by sanding?
It can be softened, but we do not offer sanding.
Related terms
Ghosting (ringing)
Ghosting is a 3D printing flaw where faint ripples, like an echo of the shape, appear behind sharp edges and corners, caused by printer vibration after a sudden change of direction.
Layer height
Layer height is the thickness of a single layer, from which the printer builds the part from the bottom up. It affects how visible the layers are on the surface and how long printing takes.
Adaptive layers
Adaptive layers are a mode where the slicer varies the layer height to suit the part: thinner layers on sloped and curved surfaces, thicker ones on vertical walls.
Under-extrusion
Under-extrusion is a 3D printing flaw where less plastic comes out of the nozzle than the slicer calculated, so lines are thin and gappy and the part is weaker.
Model orientation
Model orientation is the position in which a part lies on the build plate. In FDM printing it decides the strength, the surface finish, the amount of supports and the print time.
Vase mode
Vase mode (spiral vase) is a way of printing where the nozzle moves continuously upwards in a spiral and builds a single wall with no infill and no seam. It suits vases, plant pots and decorations.
SourcesSources checked 1 November 2026, 2
- Leadscrew, Wikipedia, checked 2026-11-01
- Fused filament fabrication, Wikipedia, checked 2026-11-01
We will print it for you
Upload a model and see the price per piece, the total with shipping and the date at once. We print in Košice, Slovakia, from PLA and PETG.
No model? No problem, pick a ready one
These sites have thousands of free models. Download an STL or 3MF and upload it here. If you sell it or use it for business, check the model licence. How to pick a model and licence