Layer shifting

Layers abruptly offset along X or Y partway up the print.

Likely causes, most likely first

1. Loose belts or pulley grub screws
2. Acceleration / speed too high (missed steps)
3. Nozzle catching on the part
4. Binding axis or stepper driver overheating

Fixes to try

• Tension the belts; tighten pulley set screws
• Reduce speed and acceleration
• Enable Z-hop / check for collisions
• Ensure axes move freely; improve driver cooling

Filaments this hits hardest

Other print defects