Quick diagnosis
A layer shift is a sudden X- or Y-axis offset that continues in later layers. It means commanded position and physical position no longer agree.
1. Look for a collision
Inspect the failed layer for a curled corner, support that detached, blob on the nozzle or infill standing above the surface. A nozzle strike can make an otherwise healthy axis lose position.
2. Check the full travel path
Power off and let the printer cool. Move only axes the manual says may be moved by hand. Look for cable, spool or enclosure contact and for debris on rails. The motion should not hit a hard obstruction.
3. Inspect pulleys and belts
Check visible pulley set screws and belt condition using the manufacturer’s method. A loose pulley can slip on its shaft. A belt that is obviously slack may skip, but overtightening can damage bearings, motors or belt teeth.
4. Reduce motion demand as a test
Return acceleration and speed to the tested printer profile. If the shift disappears, increase only within the manufacturer’s supported limits. A profile created for another machine can command motion the hardware cannot reliably follow.
5. Check motor and driver symptoms
A very hot motor, intermittent connector or repeated shift on the same axis may need manufacturer support. Do not open power-supply or electronics covers unless you are qualified and the service documentation explicitly allows it.
Layer-shift checklist
- No curled edge or print debris can strike the nozzle.
- Cables and spool stay clear through full travel.
- Pulleys are secured as documented.
- Belts are intact and not overtightened.
- Speed and acceleration match a known printer profile.
A sideways offset is a layer shift, but if the Z axis instead fails to rise the full height for a layer, causing a section to look crushed or the part to fall short of its expected height, see fixing skipping layers.