Layer shifting

The print is cleanly offset partway up, with everything above shifted in one direction.

print skewedtop half offsetstair-stepped sideways

Causes, most likely first

Ordered by how often each is actually responsible, not by how interesting it is. Work down the list.

Loose belt

Tension X and Y. A plucked belt should give a low musical note, not a dull slap.

Calibration step: Tension the X and Y belts →

Nozzle collided with the part

Usually a curled corner or a blob the nozzle caught. Fix the warping first — the shift is a symptom, not the fault.

Loose pulley grub screw

Check the grub screws on the stepper pulleys. One should seat on the flat of the shaft.

Acceleration too high for the frame

Lower acceleration — but verify belts and wheels first, or you are hiding a mechanical fault at the cost of every future print.

Calibration step: Tune cornering — acceleration and jerk, only if ringing persists →

Binding on an axis

Move each axis fully by hand with the motors off. Any tight spot is a rail alignment problem.

Calibration step: Set V-wheel preload / linear rail play →

Open First Layer →
The app walks this in order, generates the test model for your nozzle and filament, and records what you measure so nothing has to be repeated. Free, no account, works offline.