Blobs and zits on the surface

Small raised bumps, usually lining up vertically at the layer seam.

pimplesbumps at the seamscarring

Causes, most likely first

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

The nozzle over-extrudes on stopping. Pressure advance is the correct fix.

Tune retraction distance, then speed — one at a time.

Set the seam to a corner or align it. It does not remove the blob, but it hides it where nobody looks.

Dry the spool. Listen for crackling while it prints.

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.