Routine basics · monthly

Check the belt tension

Loose belts cause ghosting and ringing in prints. Check tension monthly and adjust only if they feel obviously slack.

5 minutes Difficulty 2/3

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You'll need

Open the front door
Push the toolhead to the centre so you can reach the belts on the back and side.
Pluck each belt like a guitar string
It should give a clear note, not a dull thud. Bambu's stock tension is around 110 Hz — close enough is fine.
Adjust only if obviously slack
Loosen the small tensioner screws, slide gently, re-tighten. Don't crank — over-tension wears out the motor pulleys.
Why this matters
If you've never adjusted them and the printer still sounds smooth, leave it alone.