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.
Lubrication is an important maintenance task to perform regularly. Use SuperLube Synthetic Grease<. Lubrigation needs to be performed regularly on any harden rods, linear rails and lead screws.
+Lubrication is an important maintenance task to perform regularly. Compoents 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.
Probably the most essential part of setting up your 3D printer. Most new users will trip up on this. If you have ABL, this includes making sure your Z offset has been set and saved. My method is included in the above video and this diagram is a handy reference: