Blobs and zits on the surface
Small bumps or spots on the outside walls, often where each layer starts and stops.
Also described as zits, blobs, pimples, spots on walls, bumps on surface, dots on print
Try these in order
Most likely and quickest to check first. Change one thing at a time so you know what fixed it.
Pressure in the nozzle when a layer starts or stops
- Turn on 'wipe' and coasting, or set pressure advance (linear advance) for your printer.
- Tune retraction distance and speed.
Seams spread at random
Random seam placement scatters a small zit on every layer.
- Set the seam to 'aligned' or 'rear' so the starts and stops line up in one place.
Too hot, or wet filament
- Lower the temperature a little and dry the filament.