A repeating ripple on the wall immediately after every sharp corner, fading as it goes.
echo after cornersrippleswavy walls near edges
Ordered by how often each is actually responsible, not by how interesting it is. Work down the list.
This is mechanical the great majority of the time. Tension the belts before touching a single slicer setting.
Set the eccentric nuts so each wheel grips with light drag and cannot spin freely.
Move it to something rigid. A wobbly table is a resonance amplifier — this is free to fix and frequently the whole answer.
Lower it, but only after the frame is sound. Lowering acceleration to mask a loose belt taxes every print you ever make.
Calibration step: Tune cornering — acceleration and jerk, only if ringing persists →
Tune pressure advance to control the pressure spike at direction changes.