If your printer has a motion system based on V-roller wheels riding on V-slot extrusions, check they are properly tensioned. Each location will have one eccentric nut. This can be twisted to either add or remove tension on the wheels.
If the wheels are too loose: Wobble will be present in the assembly, which will show in the print as surface artefacts.
If the wheels are too tight: The assembly will be too tense, which will wear the V-rollers prematurely.
+In some rare instances poorly adjusted rollers may affect first layer accuracy across the bed.
Lubrication is an important maintenance task to perform regularly. Components that are not adequately lubricated may bind and affect print quality. Use SuperLube Synthetic Grease. Lubrication needs to be performed regularly on any hardened rods, linear rails and lead screws.